Ed Refractor

The Orion EON 130mm Triplet ED Apochromatic Refractor features exquisite optics and mechanics for the discerning observer and imager. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. 8) Dual-speed 2" Crayford-type focuser with 1. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. Aluminum case. Black Diamond ED Refractor Ultra wide-field telescope that offers a wide swaths of sky in a single view. A staple in their catalog for almost 20 years, the Orion ED80 - an 80 mm f. The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and the built-in ED glas. There are three primary types of refractors: achromats, ED Achromats, and apochromats. Orion 100mm ED (4 Inch) f9 Apochromatic Refractor Above: Orion 100mm ED Apochromatic Refractor Telescope. Even when observing bright planetary objects, the EvoStar ED refractor minimizes color fringing to deliver an image with tack-sharp stars. There aren't many 7" refractors around, and the asking price for the 178ED, while high, is reasonable considering what you get. The AT80ED is bringing ED optics to you at a fantastic price. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. Features a 2. Specifications: Explore Scientific 127ED Apochromatic Refractor. 5" dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. 25" brass compression ring eyepiece holders. The 102 mm F/7 extra-Low dispersion - ED refractor from Teleskop-Service is an ideal transportable "Allround-telescope" for observation and astrophotography. By "fast" we mean ED doublets with a focal ratio less than F10, and fast ED triplet refractors, say, less than F7. TS ED 60 mm or Skywatcher 50 ED Evoguide? - posted in Refractors : At low power the 60 mm TS ED should have a slight advantage over the Skywatcher Evoguide with its 50 ED optics with FLP 53 glass. Promo Financing. Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. 12") aperture. 30x and above? Has anybody compared them? Thomas. 3096 x 2080 1/1. Weight: 6 lbs 3. Technicians performing optical testing and alignment often use a pure green wavelength to test optics are adhering to their design. Custom Atsrophotography Rig. 5) lens, which comes from the SkyWatcher experience with the EVOSTAR series and brings a new design and several mechanical improvements, all in a powerful but still compact telescope. At the back end of the EON 130mm Triplet ED, you'll find a new heavy-duty 2. 99 shipping. The new 102 mm f/11 ED refractor is optimized for the visual observation and photography of sun, moon and planets. ♦ Image free from chromatic aberration through 2-element ED lens with additional special glass, comparable to an FPL53 doublet with f/8. Black Diamond ED Refractor Ultra wide-field telescope that offers a wide swaths of sky in a single view. Gskyer Telescope 600x90mm Astronomical Refractor Telescope (AZ90600) 3. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value. The Starwave 80 EDT-R refractor has a triplet ED lens system with a premium Japanese Hoya FCD-100 ED glass element, with equivalent Abbe number to FPL53. By "fast" we mean ED doublets with a focal ratio less than F10, and fast ED triplet refractors, say, less than F7. Unlike heavier, bulkier astrophotography telescopes, the relatively lightweight, 15 lb. Out of stock. When this scope was available in 2008 the retail price was $549. With a clear aperture of 140mm (about 5. Autofocus for Easier Observations. Specifications: Explore Scientific 127ED Apochromatic Refractor. This premium refractor telescope's generous, 115mm (4. 50 mm apochromatic refractor with matched lens assembly with one ED element. 5 refractor with a short focal length, with nearly non-existent chromatic aberration, thanks to the extra-low dispersion glass of the objective lens. Since the tube is closed off from the outside, air currents and effects due to changing. • ED doublet refractor optics: 102mm (4") aperture, 714mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. The Sky-Watcher EvoStar 120mm ED Doublet APO Refractor is an excellent choice for planetary observing and also has enough aperture to also reveal many deep space objects. Buy Sky-Watcher Evostar ED APO 72mm f/5. The EvoStar ED refractor lens assembly utilizes a proprietary combination of matched lenses, designed to deliver optimum visual and photographic performance. This triplet apochromatic refractor telescope blends portability and performance into a single, sleek package. After the initial alignment, their optical system is more resistant to misalignment than the reflector telescopes. 420 mm focal length (f/5. save $-1,999. Refractors can also be mounted on either an equatorial or alt-azimuth mount. There are three primary types of refractors: achromats, ED Achromats, and apochromats. 25" accessory collars for convenience and security. 55 shipping + $4. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Vendor. Picture Information. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. The striking red CNC trim and carrying handle and the white gloss tube give this scope a distinctive and attractive look. 0 Apochromatic Refractor Telescope. PLUS rings offer a better stability, avoid flexures and let you connect dovetail bars, guide rings, clamps and the EAGLE. You get a 2" Rack and Pinion focuser. "Achromat" means "almost free of false colour". You get a 2" Rack and Pinion focuser. A great refractor for beginners is the Celestron StarSense Explorer LT 80AZ Refractor Telescope with Smartphone Assist. The second element is made of the highest grade ED fluorite glass (FPL-53). Sky-Watcher EvoStar 80 ED Refractor Telescope Overview: The Sky-Watcher EvoStar 80 ED Refractor Telescope is a modestly wide-field telescope offering bright, wide swaths of sky in a single view. ED doublet refractors are known as "semi-apochromats" or "super-achromats". 242 mm focal length (f/4. Add to Wish List Add to Compare. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. Quadruplet optics made up of front FPL - 53 triplet for perfect color correction plus integrated field flattener. Sky Watcher Esprit 100mm ED Triplet APO Refractor has the first-rate qualities that expert astro-photographers will appreciate. This photo is doing the rounds on social media. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Vendor. A refractor is a classic telescope design that uses a collection of lenses to gather and focus light. The superb optics of this ED refractor are matched by the quality of its mechanics. After the initial alignment, their optical system is more resistant to misalignment than the reflector telescopes. Out of stock. The Evostar r View full details. Refractor's ED glass provides excellent color correction and razor sharp images for. By "fast" we mean ED doublets with a focal ratio less than F10, and fast ED triplet refractors, say, less than F7. 5”) the APM is an f/7 doublet design using a combination of FPL-53 and lanthanum glass. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. ETX80 Observer Refractor Telescope. For this reason, you may see some doublet refractors referred to as APO doublets if they use ED lens elements or other premium glass, even though the term APO is usually reserved for triplets and quadruplets. EvoStar 80ED Apo Refractor. 25" brass compression ring eyepiece holders. " Sir Patrick Moore CBE FRS (1923 to 2012). Refractors are coveted for their superb contrast, high-definition, and coal-black sky background that make stars appear like diamonds embedded in black velvet. This photo is doing the rounds on social media. Aperture: 127mm (5. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. At the time, "apos" were rare and expensive to the point of being unattainable, and yet, here was an unassuming. Such is the on-paper prescription of the TS. When you point an achromatic refractor, like the Celestron SLT 102 and of standard crown-and-flint glass, at a bright object, a purple halo, or false colour, is seen surrounding the object. Description Reveal celestial wonders like the desolate beauty of the lunar terrain, the serene structure of Saturn's rings or the brightest deep sky treasures of the Messier catalog with Explore Scientific's ED140 FPL53 140mm f/6. 55 shipping + $4. The 100mm air-spaced ED APO Triplet optics, made of FPL-53 ED and Schott BK-7 glass,. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. 25" (61,288 Bytes). The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and integrated ED-glas. Use them and enjoy them. Use them and enjoy them. Vaonis ST80 Stellina 80mm f/5 ED Refractor Digital GoTo Telescope Observation Station. Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. Not only is the EON 115mm ED Refractor a great wide-field performer, it's also conveniently compact and measures just 28" with its sliding dew shield retracted for easy transport and storage in the included foam-lined hard carry case. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. For example, a doublet refractor with an ED (extra-low dispersion) lens element can often come close to the optical performance of a triplet with standard glass. • ED doublet refractor optics: 80mm (3. At the back end of the EON 130mm Triplet ED, you'll find a new heavy-duty 2. 5 refractor - may lay claim to being the original bargain apochromat. It maintains its shape better than FPL-53 with changes in temperature and this is an asset when apertures greater than about 115mm are considered. Sky-Watcher Equinox-66 F/400 Pro Fluorite ED APO Product InfoThe Equinox 66 is the perfect choice for birding, nature study, and/or astrophotography. 67 fully multicoated triplet apochromatic optics using an FPL-53 ED element and all Ohara glass. ♦ Image free from chromatic aberration through 2-element ED lens with additional special glass, comparable to an FPL53 doublet with f/8. 25" brass compression ring eyepiece holders. Back by popular demand with upgrades, the EON 110mm ED boasts two-element ED optics, 2. FPL-51 ED glass made by Ohara in Japan with an Abbe Number of 81. This premium refractor telescope's generous, 115mm (4. A three element optical design using extra-low dispersion (ED) optical glass of the highest grade essentially eliminates false color to deliver amazing color correction, contrast, and sharpness. Quadruplet optics made up of front FPL - 53 triplet for perfect color correction plus integrated field flattener. 25" astronomy accessories for a wide variety of applications. 99 shipping. It is suitable not only for prominent nebulae, star clusters, and galaxies, but astrographing as well. Description Reveal celestial wonders like the desolate beauty of the lunar terrain, the serene structure of Saturn's rings or the brightest deep sky treasures of the Messier catalog with Explore Scientific's ED140 FPL53 140mm f/6. What about higher magnification, e. T he Starwave ASCENT 115 ED from Altair Astro is an apochromatic refractor that will appeal to both observers and astrophotographers. 5 ED Triplet Apo Refractor Telescope # 61EDPHII + $0. Finder stalk. 80mm refractor objective doublet includes one element of high-quality FPL-53 ED or extra-low dispersion glass, which virtually eliminates false color Features a smooth-adjusting 2" aluminum Crayford focuser that accepts 2" or 1. Explore Scientific ED APO 80mm f/6 Essential. At the back end of the EON 130mm Triplet ED, you'll find a new heavy-duty 2. The Starwave 80 EDT-R refractor has a triplet ED lens system with a premium Japanese Hoya FCD-100 ED glass element, with equivalent Abbe number to FPL53. The pinnacle of Celestron's ED scopes, Celestron 80ED Refractor Spotting Scope is packed with great features and excellent optics. The Evostar r View full details. A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). 5 Sky-Watcher EvoStar 120mm ED refractor deliver both high contrast and tack sharp images. 0 inches) Type: triplet apochromatic refractor (Hoya FCD1 ED glass) Focal length/focal ratio: 952mm, f/7. 7" hybrid-drive RandP focuser, and now twist-tight 2" and 1. The reduction factor provides a 1. 3096 x 2080 1/1. With the Apex ED reducer, an f/5. I expect it would not fare well A/B'ed against an AP180, but the Astro-Physics units aren't exactly lying about for comparison (they're also NLA. The superb optics of this ED refractor are matched by the quality of its mechanics. ♦ Improved 2. This premium refractor telescope's generous, 115mm (4. The Explore Scientific ED102 Triplet CF was built for astrophotography. 5) lens, which comes from the SkyWatcher experience with the EVOSTAR series and brings a new design and several mechanical improvements, all in a powerful but still compact telescope. • both 2" and 1. "ED" means "extra-low dispersion". Currently we don't have specifications, guide prices or an ETA. The Sky-Watcher EvoStar 120mm ED Doublet APO Refractor is an excellent choice for planetary observing and also has enough aperture to also reveal many deep space objects. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. The included diagonal helps me comfortable view the alignment stars while I calibrate my mount for a night of astrophotography. Out of stock. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Explore Scientific. Sky-Watcher EvoStar 72 APO Refractor. Sky-Watcher EvoStar 80 ED Refractor Telescope Overview: The Sky-Watcher EvoStar 80 ED Refractor Telescope is a modestly wide-field telescope offering bright, wide swaths of sky in a single view. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. By "fast" we mean ED doublets with a focal ratio less than F10, and fast ED triplet refractors, say, less than F7. At one time the Vixen ED100SF cost in excess of $1200, making it. Sky Watcher Esprit 100mm ED Triplet APO Refractor has the first-rate qualities that expert astro-photographers will appreciate. • dual-speed 2. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. EclipseView™ 60mm Refracting Telescope. 5”) the APM is an f/7 doublet design using a combination of FPL-53 and lanthanum glass. 99 shipping. A staple in their catalog for almost 20 years, the Orion ED80 - an 80 mm f. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies. "Apochromat" means "totally free of false colour", and when both are pointed at a bright object in the sky. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value. PLUS rings offer a better stability, avoid flexures and let you connect dovetail bars, guide rings, clamps and the EAGLE. It maintains its shape better than FPL-53 with changes in temperature and this is an asset when apertures greater than about 115mm are considered. save $-1,999. Sky-Watcher EvoStar 72 APO Refractor. The Starwave 80 EDT-R refractor has a triplet ED lens system with a premium Japanese Hoya FCD-100 ED glass element, with equivalent Abbe number to FPL53. The scope is an F/6 480mm focal length optical tube assembly(OTA) that uses a single speed focuser and finished in a high gloss black. Altair Wave Series 80mm F6 APO. Altair Wave Series 80mm F6 APO - $1,465. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. Further, the refractor has for years been underrated as a deep sky performer. 99 + AU $49. Use them and enjoy them. The reduction factor provides a 1. This triplet apochromatic refractor telescope blends portability and performance into a single, sleek package. Technicians performing optical testing and alignment often use a pure green wavelength to test optics are adhering to their design. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies. This innovative telescope has an alt-azimuth. "Apochromat" means "totally free of false colour", and when both are pointed at a bright object in the sky. 5 ED Triplet Apo Refractor Telescope # 61EDPHII + $0. Our rating. The new 102 mm f/11 ED refractor is optimized for the visual observation and photography of sun, moon and planets. Sky-Watcher Evostar 80mm Doublet APO Refractor. 59 whereas the FCD100 has an Abbe number of 95. PLUS rings offer a better stability, avoid flexures and let you connect dovetail bars, guide rings, clamps and the EAGLE. This Astro-Tech AT102ED refractor has: The AT102ED is bringing ED optics to you at a fantastic price. Posted October 8, 2019. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. 99 shipping. Orion EON 130mm ED Triplet Apochromatic Refractor. Explore Scientific. 7" hybrid-drive RandP focuser, and now twist-tight 2" and 1. Custom Atsrophotography Rig. 5 Air-Spaced Triplet ED Apochromatic Refractor in Carbon Fiber with 3" HEX Focuser. 5x wider field of view and shortens exposure times by a factor of 2. 5 apochromatic refractor. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Explore Scientific. 25" (61,288 Bytes). A staple in their catalog for almost 20 years, the Orion ED80 - an 80 mm f. 4x! The Apex ED reducer features extra-low disperion glass. Star-tests and optical test reports are usually provided in this wavelength. Regular price. Use them and enjoy them. You get a 2" Rack and Pinion focuser. Credit: Larry Carlino. 5 inch) aperture collects ample light from faint deep-sky objects to provide crisp images with excellent color correction by virtue of the element of FK-61 extra-low dispersion (ED) optical glass in its air-spaced triplet objective lens. "Apochromat" means "totally free of false colour", and when both are pointed at a bright object in the sky. "Achromat" means "almost free of false colour". It maintains its shape better than FPL-53 with changes in temperature and this is an asset when apertures greater than about 115mm are considered. Sky-Watcher's Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. 8x Reducer / Flattener Go back to product details Includes: Sharpstar 61mm f/5. The Starwave 80 EDT-R refractor has a triplet ED lens system with a premium Japanese Hoya FCD-100 ED glass element, with equivalent Abbe number to FPL53. 10! The higher this number the lower the color dispersion. I expect it would not fare well A/B'ed against an AP180, but the Astro-Physics units aren't exactly lying about for comparison (they're also NLA. Weight (tube assembly, including standard accessories): 20 pounds. The dual-speed, Crayford-style focuser is ultra-solid and tightly locks my DSLR camera into place while imaging. ESATTO is the most advanced and affordable robotic microfocuser. Features a 2. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. 30x and above? Has anybody compared them? Thomas. Orion EON 110mm ED f/6. Refractors are coveted for their superb contrast, high-definition, and coal-black sky background that make stars appear like diamonds embedded in black velvet. • collimatable lens cell. Sky-Watcher EvoStar 72 APO Refractor. 55 shipping + $4. Refractors can also be mounted on either an equatorial or alt-azimuth mount. SkyWatcher EVOLUX 82 ED telescope is an apochromatic refractor with doublet ED 82mm diameter and 530mm focal length (f/6. 100 Evostar ED Doublet Refractor OTA View the Solar System in HD style on a clear night with transparent skies. 25" Helical focuser. This gives you a wide range of options to choose from when deciding what kind of telescope you need. This is the new Apertura 60mm ED APO Doublet with the dedicated field flattener and a 58mm T-ring connected to a Cannon 7D Mark II. Posted October 8, 2019. I tried it on a number of deep sky objects including Ha o. FPL-51 ED glass made by Ohara in Japan with an Abbe Number of 81. 4x! The Apex ED reducer features extra-low disperion glass. 67 fully multicoated triplet apochromatic optics using an FPL-53 ED element and all Ohara glass. The Sky-Watcher Pro 120ED is known to be a great performer with wonderful color correction, especially for a doublet, and comes with some nice accessories such as a 2″ diagonal, 9×50 RACI finder, and a. EVOSTAR-120ED DS-PRO OTA 120mm F900 ED APO Refractor £1,399. Further, the refractor has for years been underrated as a deep sky performer. 54 − less expensive and easier to work with than FPL-52 or FPL-53 and chemically very stable. This premium refractor telescope's generous, 115mm (4. Description Reveal celestial wonders like the desolate beauty of the lunar terrain, the serene structure of Saturn's rings or the brightest deep sky treasures of the Messier catalog with Explore Scientific's ED140 FPL53 140mm f/6. 5 Apochromatic Refractor. The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and integrated ED-glas. Even when observing bright planetary objects, the EvoStar ED refractor minimizes color fringing to deliver an image with tack-sharp stars. Sky-Watcher USA Esprit 150mm ED Triplet APO Refractor. The included diagonal helps me comfortable view the alignment stars while I calibrate my mount for a night of astrophotography. • ED doublet refractor optics: 102mm (4") aperture, 714mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. Levenhuk Ra R90 ED Doublet OTA Review. Custom Atsrophotography Rig. The reintroduction not only has a much lower price, but it has better mechanics as well as advancements in the optical assembly and polish. The HOYA extra-low dispersion (ED) glass is a trait found in a much more expensive refractor telescope. Available at a surprisingly low price, this Orion EON telescope is a premium ED APO triplet refractor optical tube assembly with 130 mm (5. 5x wider field of view and shortens exposure times by a factor of 2. 99 + AU $49. 5" dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. Gskyer Telescope 600x90mm Astronomical Refractor Telescope (AZ90600) 3. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. And with the two-part field corrector and Helinear Track focusing system, Sky Watcher Esprit Refractor will guarantee sturdiness. Click on image to see enlarged view (99,351 bytes). Customize Sharpstar 61EDPHII 61mm f/5. Posted October 8, 2019. This innovative telescope has an alt-azimuth. The Explore Scientific ED102 Triplet CF was built for astrophotography. The reintroduction not only has a much lower price, but it has better mechanics as well as advancements in the optical assembly and polish. Key Features. "Achromat" means "almost free of false colour". Description. Designed with the discerning astrophotographer in mind, Sky-Watcher USA’s top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more. Its fast optics and generous field of view make it an ideal instrument for studying larger clusters and star fields too (see specs below). TS ED 60 mm or Skywatcher 50 ED Evoguide? - posted in Refractors : At low power the 60 mm TS ED should have a slight advantage over the Skywatcher Evoguide with its 50 ED optics with FLP 53 glass. Use them and enjoy them. D & G refractors are far less sensitive to temperature changes and tube currents than are reflectors. VAT) Out of stock EVOSTAR-150ED DS-PRO OTA 150mm F8 ED APO Refractor £1,699. 5 apo refractor becomes an incredibly fast f/3. 72 mm apochromatic refractor with matched lens assembly with one ED Element. 72 mm apochromatic refractor with matched lens assembly with one ED Element. Technicians performing optical testing and alignment often use a pure green wavelength to test optics are adhering to their design. Buy Sky-Watcher Evostar ED APO 72mm f/5. 5 triplet with the center ED lens element being the slightly less desireable FPL-51 Hoya glass. In side by side comparisons with a Genesis refractor and a Takahashi, I could see no difference in optical performance visually. It is suitable not only for prominent nebulae, star clusters, and galaxies, but astrographing as well. Our rating. 25" accessory collars for convenience and security. 0 Apochromatic Refractor Telescope. Tube-ring attachment hardware with V-style dovetail plate. Classical long focal ratio apochromatic refractors, such as the f/7. T he Starwave ASCENT 115 ED from Altair Astro is an apochromatic refractor that will appeal to both observers and astrophotographers. The glass surface inside the tube is sealed from the atmosphere so it rarely needs cleaning. Integrated Light Pollution Filter. Meade Instruments: A world leader in the manufacturing of Telescopes, Solar Telescopes, Microscopes, Optics, Binoculars, for amateur astronomers and hobbyists. Orion EON 110mm ED f/6. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. Weight: 6 lbs 3. VAT) Out of stock EVOSTAR-72ED DS-PRO OTA 72mm F5. Quadruplet optics made up of front FPL - 53 triplet for perfect color correction plus integrated field flattener. By: Vlad Fedosov. ♦ Improved 2. Esprit 120mm ED Triplet APO Refractor. 0 inches) Type: triplet apochromatic refractor (Hoya FCD1 ED glass) Focal length/focal ratio: 952mm, f/7. The pinnacle of Celestron's ED scopes, Celestron 80ED Refractor Spotting Scope is packed with great features and excellent optics. With a clear aperture of 140mm (about 5. Sky-Watcher Evostar 80mm Doublet APO Refractor. Celestron FirstScope 90EQ 90mm Refractor Telescope. The scope also features a premium 3" dual-speed 10:1 rack-and-pinion focuser with 58mm of travel that handles most full-frame astronomy. 5 refractor with a short focal length, with nearly non-existent chromatic aberration, thanks to the extra-low dispersion glass of the objective lens. Review on the Meade 127 ED APO Refractor My Astronomy Experience The first telescope I owned back in the late 60s was a cheap department store 50mm refractor with a tiny metal tripod. Visionking 65-390 ED APO Refractor Astronomical Telescope Spotting Scope. 12") aperture. Regular price US$ 569. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. "ED" means "extra-low dispersion". The APM 140mm doublet ED apochromatic refractor neatly fills the gap between some very capable 5-inchers and the much more difficult-to-mount 6-inch instruments. "False colour" is also known as "chromatic aberration". OTA Weight: 22lbs. Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. Currently we don't have specifications, guide prices or an ETA. 25" (61,288 Bytes). With a clear aperture of 140mm (about 5. FCD100 is Hoya's version of the Ohara FPL53 which we use in our apo triplet refractors. • both 2" and 1. Doublet ED Lanthanum Glass Lens System. The scope also features a premium 3" dual-speed 10:1 rack-and-pinion focuser with 58mm of travel that handles most full-frame astronomy. This triplet apochromatic refractor telescope blends portability and performance into a single, sleek package. The APM 140mm doublet ED apochromatic refractor neatly fills the gap between some very capable 5-inchers and the much more difficult-to-mount 6-inch instruments. Since the tube is closed off from the outside, air currents and effects due to changing. Sky-Watcher Evostar 80mm Doublet APO Refractor. At the back end of the EON 130mm Triplet ED, you'll find a new heavy-duty 2. Standard accessories: tube mounting rings, 50mm finder, 2-inch diagonal, dovetail plate. 3096 x 2080 1/1. 5 refractor with a short focal length, with nearly non-existent chromatic aberration, thanks to the extra-low dispersion glass of the objective lens. The AT80ED is bringing ED optics to you at a fantastic price. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used for long-focus camera lenses. Even when observing bright planetary objects, the EvoStar ED refractor minimizes color fringing to deliver an image with tack-sharp stars. 5 apo refractor becomes an incredibly fast f/3. Its fast optics and generous field of view make it an ideal instrument for studying larger clusters and star fields too (see specs below). Apparently it shows two prototype ED doublet refractors, a 62 and 82mm, that will sit somewhere between Sky-Watcher's Evostar ED doublets and Esprit triplets. The reduction factor provides a 1. Integrated Light Pollution Filter. When you point an achromatic refractor, like the Celestron SLT 102 and of standard crown-and-flint glass, at a bright object, a purple halo, or false colour, is seen surrounding the object. 5 ED Triplet Apo Refractor Telescope # 61EDPHII + $0. 5 Sky-Watcher EvoStar 120mm ED refractor deliver both high contrast and tack sharp images. 5) lens, which comes from the SkyWatcher experience with the EVOSTAR series and brings a new design and several mechanical improvements, all in a powerful but still compact telescope. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies. This photo is doing the rounds on social media. Refractors equipped with a 90 degree star diagonal produce images that are upright but right-left reversed, making them useful for both terrestrial viewing and stargazing purposes. Superb f/6 astrograph or wide-field visual scope! $1,399. 5 apo refractor becomes an incredibly fast f/3. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. At one time the Vixen ED100SF cost in excess of $1200, making it. 50 mm apochromatic refractor with matched lens assembly with one ED element. For example, a doublet refractor with an ED (extra-low dispersion) lens element can often come close to the optical performance of a triplet with standard glass. EvoStar 80ED Apo Refractor. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. This is the new Apertura 60mm ED APO Doublet with the dedicated field flattener and a 58mm T-ring connected to a Cannon 7D Mark II. Explore Scientific's broad selection of refracting telescopes includes apochromatic refractors ranging in aperture from 80mm to 165mm, achromatic telescopes perfect for astronomy outreach and beginner refractors from brands like National Geographic and Discovery that are great for backyard. • ED doublet refractor optics: 80mm (3. 0 inches) Type: triplet apochromatic refractor (Hoya FCD1 ED glass) Focal length/focal ratio: 952mm, f/7. The new 2,4" focuser has a better load. I expect it would not fare well A/B'ed against an AP180, but the Astro-Physics units aren't exactly lying about for comparison (they're also NLA. 8x Reducer / Flattener Go back to product details Includes: Sharpstar 61mm f/5. Gskyer Telescope 600x90mm Astronomical Refractor Telescope (AZ90600) 3. Orion 100mm ED (4 Inch) f9 Apochromatic Refractor Above: Orion 100mm ED Apochromatic Refractor Telescope. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Vendor. 25" accessory collars for convenience and security. Superb f/6 astrograph or wide-field visual scope! $1,399. EON 115mm optical tube. Technicians performing optical testing and alignment often use a pure green wavelength to test optics are adhering to their design. The resulting crispness and contrast of image make the refractor ideal for high resolution lunar, planetary and double star work. The Explore Scientific ED102 Triplet CF was built for astrophotography. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. Buy Sky-Watcher Evostar ED APO 72mm f/5. 5) lens, which comes from the SkyWatcher experience with the EVOSTAR series and brings a new design and several mechanical improvements, all in a powerful but still compact telescope. The compact 80 mm F/7 Extra-Low Dispersion - ED refractor from Teleskop-Service is a solid and very transportable "Allround-Telescope" for observation and astrophotography. Apparently it shows two prototype ED doublet refractors, a 62 and 82mm, that will sit somewhere between Sky-Watcher's Evostar ED doublets and Esprit triplets. Orion EON 130mm ED Triplet Apochromatic Refractor. Credit: Larry Carlino. 7" hybrid-drive RandP focuser, and now twist-tight 2" and 1. 5 refractor with a short focal length, with nearly non-existent chromatic aberration, thanks to the extra-low dispersion glass of the objective lens. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value. 72 mm apochromatic refractor with matched lens assembly with one ED Element. VAT) Out of stock EVOSTAR-72ED DS-PRO OTA 72mm F5. Orion EON 110mm ED f/6. With their three-element air spaced objective lens design, false color is completely eliminated, yielding exceptional contrast and sharpness. Faster and about the same physical length as the Orion 100mm ED, and still incredibly light weight! Above: Similar Orion 100mm ED Apochromatic Refractor Telescope. The Orion EON 130mm Triplet ED Apochromatic Refractor features exquisite optics and mechanics for the discerning observer and imager. 99 + AU $49. By "fast" we mean ED doublets with a focal ratio less than F10, and fast ED triplet refractors, say, less than F7. Visionking 65-390 ED APO Refractor Astronomical Telescope Spotting Scope. A refracting telescope (also called a refractor) is a type of optical telescope that uses a lens as its objective to form an image (also referred to a dioptric telescope). (7) Total Ratings 7, $359. Although large refracting telescopes were very popular in the second half of the. 5 Sky-Watcher EvoStar 120mm ED refractor deliver both high contrast and tack sharp images. Altair Wave Series 80mm F6 APO - $1,465. 8 Focal Ratio, Extra Low-Dispersion Lens Element, Dual-Speed 2" Crayford Focuser, Cradle-Ring Assembly, Vixen Dovetail, Hard Aluminum Carrying Case, OTA Only; Mount and Tripod Required. The EON 130mm Triplet ED Refractor features an extendable dew shield that further ensures excellent contrast and helps inhibit dew formation on the lens. "False colour" is also known as "chromatic aberration". 25" (61,288 Bytes). 3096 x 2080 1/1. Specifications: Explore Scientific 127ED Apochromatic Refractor. 30x and above? Has anybody compared them? Thomas. Buy Sky-Watcher Esprit 100 mm ED APO Triplet Refractor - (OTA only, no mount) from only $2,545. B&H # VAST80 MFR # ST80. The new 2,4" focuser has a better load. I expect it would not fare well A/B'ed against an AP180, but the Astro-Physics units aren't exactly lying about for comparison (they're also NLA. Sky-Watcher EvoStar 80 ED Refractor Telescope Overview: The Sky-Watcher EvoStar 80 ED Refractor Telescope is a modestly wide-field telescope offering bright, wide swaths of sky in a single view. The Altair Astro 80mm ED Triplet APO refractor uses a 480mm focal length lens cell with Japanese Ohara FPL53 ED glass. 8 ED APOC Refractor £335. Apparently it shows two prototype ED doublet refractors, a 62 and 82mm, that will sit somewhere between Sky-Watcher's Evostar ED doublets and Esprit triplets. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. Regular price US$ 569. Sky-Watcher USA Esprit 150mm ED Triplet APO Refractor. The EON 130mm Triplet ED Refractor features an extendable dew shield that further ensures excellent contrast and helps inhibit dew formation on the lens. 8) Dual-speed 2" Crayford-type focuser with 1. Back by popular demand with upgrades, the EON 110mm ED boasts two-element ED optics, 2. The Sky-Watcher Pro 120ED is known to be a great performer with wonderful color correction, especially for a doublet, and comes with some nice accessories such as a 2″ diagonal, 9×50 RACI finder, and a. Credit: Ed Ting. Features a 2. 420 mm focal length (f/5. Orion EON 110mm ED f/6. ♦ Adjustable lens mount. 25" Helical focuser. Classical long focal ratio apochromatic refractors, such as the f/7. Sky-Watcher EvoStar 72 APO Refractor. When this scope was available in 2008 the retail price was $549. ESATTO is the most advanced and affordable robotic microfocuser. 5" focuser, twist lock compression rings, sliding dew shield, and includes a hard case for transport. 5″ dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. 30x and above? Has anybody compared them? Thomas. • dual-speed 2. With an aperture of F/7, and focal length of 714mm, deep sky astrophotography targets such as nebulae, star cluster, and large galaxies. 5" focuser, twist lock compression rings, sliding dew shield, and includes a hard case for transport. Add to cart. 0 out of 5 star rating. VAT) Out of stock EVOSTAR-72ED DS-PRO OTA 72mm F5. Out of stock. 59 whereas the FCD100 has an Abbe number of 95. ETX80 Observer Refractor Telescope. Sky-Watcher ED APO refractors utilize the most modern optical glasses and fabricating techniques to deliver the ultimate in high-fidelity astronomical imaging. I expect it would not fare well A/B'ed against an AP180, but the Astro-Physics units aren't exactly lying about for comparison (they're also NLA. The refractor style 80-ED (APO) features a 2" rack and pinion focuser and has a bracket that can adapt to a photo tripod or attach to Celestron's Advanced GT equatorial mount. This gives you a wide range of options to choose from when deciding what kind of telescope you need. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. 67 fully multicoated triplet apochromatic optics using an FPL-53 ED element and all Ohara glass. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. Weight: 6 lbs 3. At the time, "apos" were rare and expensive to the point of being unattainable, and yet, here was an unassuming. 242 mm focal length (f/4. What about higher magnification, e. 67 fully multicoated triplet apochromatic optics using an FPL-53 ED element and all Ohara glass. Out of stock. T he Starwave ASCENT 115 ED from Altair Astro is an apochromatic refractor that will appeal to both observers and astrophotographers. 5 refractor - may lay claim to being the original bargain apochromat. When this scope was available in 2008 the retail price was $549. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. This triplet apochromatic refractor telescope blends portability and performance into a single, sleek package. ED doublet refractors are known as "semi-apochromats" or "super-achromats". The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and integrated ED-glas. Sky-Watcher Equinox-66 F/400 Pro Fluorite ED APO Product InfoThe Equinox 66 is the perfect choice for birding, nature study, and/or astrophotography. Sky-Watcher's Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. 6 astrograph. " Sir Patrick Moore CBE FRS (1923 to 2012). 7" rack-and-pinion focuser with 11:1 ratio fine focusing. 5”) the APM is an f/7 doublet design using a combination of FPL-53 and lanthanum glass. "Achromat" means "almost free of false colour". 12") aperture. Simply turn your Sky-Watcher 100/900 Evostar ED Doublet OTA to the Crescent Moon , the Apennine Mountains snap into razor-sharp focus revealing a cornucopia of jagged mountain ridges, canyons, and numerous small craters in ultra high. Levenhuk Ra R90 ED Doublet OTA Review. Sale price. Black Diamond ED Refractor The Black Diamond 80 ED is a modestly wide-field telescope offering bright, wide swaths of sky in a single view. Such is the on-paper prescription of the TS. 5x wider field of view and shortens exposure times by a factor of 2. 0 inches) Type: triplet apochromatic refractor (Hoya FCD1 ED glass) Focal length/focal ratio: 952mm, f/7. Sky Watcher Esprit 100mm ED Triplet APO Refractor has the first-rate qualities that expert astro-photographers will appreciate. 5 Apochromatic Quadruplet Refractor Telescope with Field Flattener. With the correct prescription of lens geometry and mating glass element, FPL51 is capable of producing an excellent ED refractor, but the choice of FPL53 glass wherever possible gives the optical designer far greater freedom to produce a doublet with a performance deserving of the name 'apo'. • ED doublet refractor optics: 80mm (3. 5″ dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. Not only is the EON 115mm ED Refractor a great wide-field performer, it's also conveniently compact and measures just 28" with its sliding dew shield retracted for easy transport and storage in the included foam-lined hard carry case. Revelation 80mm "ED APO" Refractor Review. 2006 Topps Chrome Refractors #111 Ed Reed - NM-MT. • both 2" and 1. Regular price US$ 569. Refractors can also be mounted on either an equatorial or alt-azimuth mount. save $-1,999. Currently we don't have specifications, guide prices or an ETA. 8x Reducer / Flattener Go back to product details Includes: Sharpstar 61mm f/5. Designed wtih the discerning astrophotographer in mind, Sky-Watcher USA's top-of-the-line Esprit refractors deliver the kind of imaging performance one would expect from telescopes costing thousands of dollars more. I used to put it on the roof on my father's car and look at the moon. The EON 130mm Triplet ED Refractor features an extendable dew shield that further ensures excellent contrast and helps inhibit dew formation on the lens. Click on image to see enlarged view (99,351 bytes). With the Meade, you have the option of doing serious deep-sky observing. 2006 Topps Chrome Refractors #111 Ed Reed - NM-MT. 5" dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. The second element is made of the highest grade ED fluorite glass (FPL-53). 420 mm focal length (f/5. 5 refractor - may lay claim to being the original bargain apochromat. For this reason, you may see some doublet refractors referred to as APO doublets if they use ED lens elements or other premium glass, even though the term APO is usually reserved for triplets and quadruplets. Our rating. The APM 140mm doublet ED apochromatic refractor neatly fills the gap between some very capable 5-inchers and the much more difficult-to-mount 6-inch instruments. It is well suited for wide-field astronomical observation of prominent nebulae, star clusters, and galaxies from a dark-sky location, or can be used as an astrograph for sky photography. At one time the Vixen ED100SF cost in excess of $1200, making it. 6 out of 5 stars. 25" accessory collars for convenience and security. Description. 5″ dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. Currently we don't have specifications, guide prices or an ETA. Combines a reasonably fast f/7 focal ratio and triplet 3-lens ED optics for excellent performance during both visual and imaging operations. The new 102 mm f/11 ED refractor is optimized for the visual observation and photography of sun, moon and planets. EvoStar 80ED Apo Refractor. Standard accessories: tube mounting rings, 50mm finder, 2-inch diagonal, dovetail plate. This premium refractor telescope's generous, 115mm (4. Celestron FirstScope 90EQ 90mm Refractor Telescope. Out of stock. Such is the on-paper prescription of the TS. The scope also features a premium 3" dual-speed 10:1 rack-and-pinion focuser with 58mm of travel that handles most full-frame astronomy. 1") aperture, 560mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. This gives you a wide range of options to choose from when deciding what kind of telescope you need. The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and the built-in ED glas. 242 mm focal length (f/4. 8) Dual-speed 2" Crayford-type focuser with 1. 6 out of 5 stars. 5 refractor - may lay claim to being the original bargain apochromat. Doublet ED Lanthanum Glass Lens System. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. B&H # VAST80 MFR # ST80. The second element is made of the highest grade ED fluorite glass (FPL-53). This is a popular scope amongst astrophotographers, and can also be used for visual observing. Explore Scientific. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Vendor. Credit: Larry Carlino. The EvoStar ED refractor lens assembly utilizes a proprietary combination of matched lenses, designed to deliver optimum visual and photographic performance. (7) Total Ratings 7, $359. 100 Evostar ED Doublet Refractor OTA View the Solar System in HD style on a clear night with transparent skies. Doublet ED Lanthanum Glass Lens System. The APM 140mm doublet ED apochromatic refractor neatly fills the gap between some very capable 5-inchers and the much more difficult-to-mount 6-inch instruments. Buy Sky-Watcher Esprit 100 mm ED APO Triplet Refractor - (OTA only, no mount) from only $2,545. OTA Weight: 22lbs. What about higher magnification, e. With the Meade, you have the option of doing serious deep-sky observing. Sky-Watcher Equinox-66 F/400 Pro Fluorite ED APO Product InfoThe Equinox 66 is the perfect choice for birding, nature study, and/or astrophotography. The second element is made of the highest grade ED fluorite glass (FPL-53). Advertisement The telescope is offered as an optical tube assembly-only package, meaning that additional accessories are required to use the telescope, such as a star diagonal and eyepieces for observing, or a. 25" astronomy accessories for a wide variety of applications. Autofocus for Easier Observations. Posted October 8, 2019. At the back end of the EON 130mm Triplet ED, you'll find a new heavy-duty 2. 5" focuser, twist lock compression rings, sliding dew shield, and includes a hard case for transport. 1") aperture, 560mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. ED doublet refractors are known as "semi-apochromats" or "super-achromats". Out of stock. 5 Apochromatic Quadruplet Refractor Telescope with Field Flattener. This Chinese-sourced telescope raised some eyebrows at first. Quadruplet optics made up of front FPL - 53 triplet for perfect color correction plus integrated field flattener. Tube-ring attachment hardware with V-style dovetail plate. 54 − less expensive and easier to work with than FPL-52 or FPL-53 and chemically very stable. A slower f/9 telescope like an RC becomes a speedy f/5. Apparently it shows two prototype ED doublet refractors, a 62 and 82mm, that will sit somewhere between Sky-Watcher's Evostar ED doublets and Esprit triplets. When I saw a Revelation 80mm "ED APO" for sale that was priced as an achromat I had to jump at the opportunity to check it out. 5) lens, which comes from the SkyWatcher experience with the EVOSTAR series and brings a new design and several mechanical improvements, all in a powerful but still compact telescope. Doublet ED Lanthanum Glass Lens System. • collimatable lens cell. Even when observing bright planetary objects, the EvoStar ED refractor minimizes color fringing to deliver an image with tack-sharp stars. Classical long focal ratio apochromatic refractors, such as the f/7. 7" hybrid-drive RandP focuser, and now twist-tight 2" and 1. 8 Refractor Guidescope (OTA Only) featuring For Autoguiding, Imaging, Observation, 72mm Apochromatic Doublet Lens, 420mm Focal Length, f/5. 0 inches) Type: triplet apochromatic refractor (Hoya FCD1 ED glass) Focal length/focal ratio: 952mm, f/7. Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. This high-grade glass greatly reduces the chromatic aberration inherent in standard achromatic refractor telescopes. 1") aperture, 560mm focal length, f/7 focal ratio doublet optical system using an FK-61 ED (Extra-low Dispersion glass) element to reduce spurious color halos and fringing to vanishingly low levels. 100 Evostar ED Doublet Refractor OTA View the Solar System in HD style on a clear night with transparent skies. 127mm Apochromatic Refractor - FCD-1 ED Triplet Essential Series (ES-ED127075-03) Vendor. 5" dual-speed Rack-and-pinion focuser with precise 10:1 fine focus control. Available as an Optical Tube Assembly as shown above with 2" Focuser and Reducer to 1. OTA Weight: 22lbs. The Meade Series 6000 ED APO Triplet Refractor has been made with both the observer and imager in mind. Whatever your application, we're sure that Sky-Watcher Equinox refractors will meet and exceed your most. 3096 x 2080 1/1. Aluminum case. 2" SV503 102F7 ED Doublet Refractor Telescope. The well corrected optics provide an almost aberration-free image, due to the moderate f-ratio and the built-in ED glas. Sky-Watcher Equinox-66 F/400 Pro Fluorite ED APO Product InfoThe Equinox 66 is the perfect choice for birding, nature study, and/or astrophotography. These ED Refractors are built with a two-element air-spaced objective. For example, a doublet refractor with an ED (extra-low dispersion) lens element can often come close to the optical performance of a triplet with standard glass. A refractor is a classic telescope design that uses a collection of lenses to gather and focus light. The compact 80 mm F/7 Extra-Low Dispersion - ED refractor from Teleskop-Service is a solid and very transportable "Allround-Telescope" for observation and astrophotography. In Stock Unavailable. The ED80 refractor telescope sports a multi-coated 80mm aperture objective lens doublet, one element of which is crafted from Extra-Low Dispersion, or "ED" optical glass. Picture Information. The scope also features a premium 3" dual-speed 10:1 rack-and-pinion focuser with 58mm of travel that handles most full-frame astronomy. To me the Sky-Watcher range of instruments are very good indeed, and suited to amateurs of all kinds - and they are not priced out of the market! Excellent value.