25" (286mm) deep including the feet that prevent the case from resting directly on the ground. The really odd part is that the SV60EDS and AT65EDQ look as if they came out of the same factory! Same focuser. Edited by Phillip Creed, 11 July 2023 -. The set up new is over $1,150 plus shipping. This Astro-Tech AT80ED refractor has: • split tube rings with detachable Vixen-style dovetail for installation on virtually any mount. The TS is maybe 80 or 90% of the BVF - PLUS it has an ED objective yet it's sold at a far lower price. This new Astro-Tech AT80EDT refractor has: • 80mm f/6 fully multicoated triplet apochromatic optics using an ED center element. 8x reducer / flattener for the 60ED. Both great scopes when coupled with the William Optics adjustable flattener. I have been considering the Astro-Tech AT60ED 60mm and the Apertura 60mm FPL-53. I figure learn what Im doing, then. 8x flattener. Lukomatico just gave the Gear 60 a great review on YouTube. Astro-Tech uses two ED (Extra-low Dispersion glass) elements in the optical design of the AT60EDP. Altair Astro Limited is a UK CompanyCurrently, I want a frustration free experience before taking up bigger challenge. The main thing I like about a triplet in this case is that it would provide a little extra weight for balancing against a 2" star diagonal and eyepiece compared to a doublet. But a 0. Does Not Apply. We've helped hundreds of thousands of people pick the right telescopes or accessories since 1979. Posted 04 October 2023 - 09:27 PM. And comes with a test report. Cloudy Nights. VAT) Altair 2 inch Magnetic Filter Holder - T2 - Version 2 £75. The sleeve between the flanges is what affords the full 360˚ rotation of the focuser. This is one premium-quality diagonal that doesn't happen to be priced like one - and it's still a hot product for many observers. The Astro-Tech AT60EDP Astrograph from Astronomics is a unique apochromatic ED Petzval refractor astrograph that has a four lens fully multicoated. William Optics RedCat 51 (Upgraded Version) + William Optics 48mm T-mount for Sony E-mount 2. 11/11/2023 09:35PM. 11/11/2023 05:45PM. 00. The ZWO EAF is a couple hundred dollars either way you go. I note that the 60ED is also described as a quad but is actually a doublet. eBay item number: 284284336129. 00. ") at 15mm. SWAS70ED-OTA, plus 0. Pending edit 1; Mounts 621 ; Filters 2238 ; Accessories 1413 ; Software 386 ; Contributors 50 ;Page 1 of 2 - PF vs. Please Log In to view the details for this classified ad. Sharpstar 400F5. Dust / Reflection Calculator. Astro-Tech College Tuition Sale; iOptron 20% Off Sale While Supplies Last; Meteorites. The Astro-Tech AT60ED might be just the compact high-quality grab-and-go or travel scope you have been searching for. At best, you can use a cropped sensor, mirrorless camera. Celestron Nexstar 102 GT computerized 4” refractor $140. The EDL has better glass. Focusing Masks For Telescopes. This scope is the ultimate doublet refractor for those not wanting the weight and cool down of a triplet optical set. Ender 3 Pro V2 Direct Drive Speedy Spider Hot End 3DQF PLA. Quick view. The Astro-Tech ATRF60 reducer/flattener threads on the 60ED focusers. I've been very pleased with my 28mm Astro-Tech UWA. Telescopes Canada grew from our personal hobby to Canada's largest dealer for many manufacturers like Celestron, Sky-Watcher, ZWO, William Optics, iOptron, Optolong,. It's a 102mm f/7 doublet refractor made with fk61 ED glass. -- John Vienna, VA iexos-100-2, Orion 80 ED, Astro-Tech 60ED, Celestron Comet Catcher, Nikon D90 astro modified, SVBONY SV165 40mm, SVBONY 905c guide camera Screenshot _25_. The AT70ED is bringing ED optics to you at a fantastic price. 5 doublet with one FPL-53ED lens with multi-layer coatings one all surfaces and a 2" dual-speed 360 degree rotating rack and pinion focuser. Thank you Jeremy #2 06-01-2016, 06:11 PM barx1963 (Malcolm) Bright the hawk's flight : Join Date: Nov 2008. Astro-Tech 60ED Unboxed Equipment Discussions. The price difference between the two not counting taxes or shipping is only about $10. Having heard many good things. The Astro-Tech 60ED is high on the list when it becomes available. 00 £806. Posts: 137; Joined: 04 Aug 2020; Loc: New Hampshire, NH; Posted 18 April 2021 - 08:31 PM. 8X reducer (384mm @ f/4. This has been my quick view/travel scope for a couple of years and it is an amazing little scope, packing a big punch in a small package. 5mm, 21mm, 11mm spacers > ASI294. I am currently using the AT60ED without a field flattener with a crop sensor DSLR (700D) and have found that while it is usable, you want the field flattener. The Astro-Tech AT60EDP astrograph provides an exceptionally flat field for very wide images that are sharp edge-to-edge, with no need for a separate field flattener. The Ultimate Kit for the Apertura 60 mm Doublet RefractorIncludes a Full-Frame Field Flattener and 32 mm Guidescope. So until then I am stuck using scope uncorrected. 8X Reducer/Flattener + Williams Optics Guidescope package. SWAS70ED-VISKIT. Attached Thumbnails. If are on very tight budget can get instead a decent "department-store level" phototripod equipped with a ball-head (prices around 80-120. WO Zenithstar 61 APO $478. 3. We carry all brands and products, like Meade telescopes, Celestron telescopes, and more. Astro-Tech 60ED. From my experience and knowledge I have learned the past year or two, I want a small refractor for my ZWO ASI1600mm. (I assume that the mechanics of the tube/focuser are the same on all Astro Techs, especially the 80mm scopes. Astro Tech 60ED in my Apache 3800 from Harbor Freight. 5 and F6 versions. The WO Redcat is. 8X Reducer for 60ED (ATRF60) Software Adobe Photoshop · Pleiades Astrophoto PixInsight · Steffen Hirtle GraXpert Guiding. the flattener produces wonderful flat fields as well as a 41mm image circle. Now some tubes will need a little extra felt, like the Astro-Tech 60ED. 25-inch adaptor. We carry all brands and products, like Meade telescopes, Celestron telescopes, and more. Our calculator, at typical seeing of 2-4”, uses the Nyquist formula of 1/2 and the 1/3 to stop stars becoming square so the optimal range is between 0. Astro-Tech . As a short refractor, it's meant for wide-field views and astrophotography. topic starter. California nebula Astro-Tech 60ED test Equipment Imaging Telescopes Or Lenses Astro-Tech astrotech 60mm Imaging Cameras ZWO ASI1600MM COOL Mounts iOptron. 90. • durable nylon soft carry case. $0. ASTRO-TECH AT60ED 60MM F/6 FPL-53ED AND LANTHANUM DOUBLET I am selling my Astro-Tech 60ed + . 1" F/7 ED REFRACTOR - posted in Refractors : Well just ordered me a ASTRO-TECH AT80ED 3. Stars are generally small with an even focused field across the QHY8. They have the standard 102ED for like 560. This Astrozap focusing cap with built-in Bahtinov focusing mask will fit most 80mm aperture fast focal ratio ED refractors, such as the Astro-Tech AT80EDT ED triplet apo, or any scope with an optical tube or lens shade measuring between approximately 101mm (4") and 110mm (4. After this, I chose a different base image and it began processing - but loading every image FAILED before. ASTRO-TECH AT60EDP 60MM F/5 DUAL ED PETZVAL OTA - posted in Refractors : I saw this for sale on the Astronomics website today. These have caught my eye: RVO Horizon 60ED ( £500 with flattener ) Altair 60 EDF ( £600 with flattener ) Both the RVO and Altair seem literally identical. I've been eyeing a longer focal length refractor with a bit more aperture than my AT72ED for awhile. These mount holes are 20mm apart, is this a standard size, or do I need something proprietary to mount something on the scope. I have an Astro tech 60ED scope and recently purchased an ATR8 0. 2 vs 1: Astro-Tech 102ED Initial Impressions and Casual Backyard Shoot Out - posted in Refractors : Yesterday I took delivery of a beautiful AT102ED, my first ED scope. 67 (ex. Starwave 60ED Imaging Refractor From: £379. $139. Length: 18" dewshield retracted, 21. 7- Astro Telescope 102 F/11- very nice scope, classic Fronhofer But out classed by my Altar 102ED F/1122. 8X REDUCER FIELD FLATTENER - posted in Refractors : Anyone know or care to explain the difference between the ATR8 and the ATRF72 Focal Reducers/Field Flatteners?The ATRF72 is out of stock for the foreseeable future, but the ATR8 is readily available at the same price - what gives?TIA. This scope is the ultimate doublet refractor for those not wanting the weight and cool down of a triplet optical set. Last updated on Jul 13, 2023 15:59:36 PDT View all revisions View all revisions. 8x Reducer Field Flattener For the 60ED Optical Tubes. It takes a telescope dealer with practical hands-on telescope experience. Astro tech 60ed . . Some of the youtube videos talk about a backfocus adjustment of 3mm, but this particular focal reducer doesn't seem to have the ability to adjust - it is a. Astro-Tech . Astro-Tech has a reducer/field flattener for the 130EDT available for $199. California nebula Astro-Tech 60ED test Equipment Imaging Telescopes Or Lenses Astro-Tech astrotech 60mm Imaging Cameras ZWO ASI1600MM COOL Mounts iOptron iEQ45 Pro Filters Astronomik Blue 31mm · Astronomik Green 31mm · Astronomik Red 31mm · Astronomik Lum 31mm · Astronomik H-Alpha 6nmAstro-tech 60ED FPL53 glass wide FOV imaging setup. The Starwave 60ED is super compact with a modular design. 8x focal reducer/flattener from Astronomics. Thank you Jeremy. . SKU: N/A Category: Discontinued Product. Star test results using an artificial star at a distance. Please stay tuned. The Astro-Tech reducer/flatteners thread into the focuser for a solid connection. For Sale. The handle will help making set up much easier as you have a solid part to grab onto and not just the tube. Would I be better off with the Flat61R on the AT60ED or the Astro-Tech . 92 (ex. I have talked to the people at astronmics. It’s $949. I am not clear how the more expensive triplet like the Sharpstar or Radian would be better, given the positive reviews of the lack of color shift in the AT telescope. Not so good for planets. 9 specification likely results from a lens cell with a slightly larger entrance pupil). Edited by Highburymark, 23 January 2023 - 03:38 PM. SV102ED, 102mm objective, f/6. The Sharpstar 60ED is a versatile telescope that is perfect for viewing celestial objects such as the moon, planets, and stars. . The 72mm, f/6 primary lens is an air-spaced ED doublet using FPL-53 optics. The prospective user can obtain optics of equal or slightly. I have talked to the people at astronmics. I mainly do imaging so the Astro-tech is a FPL-51 triplet and the APM is a FPL-53 doublet, I have a hard time figuring out which is better. 0mm) = 20. Based on the classic two-doublet Petzval. It's all a compromise between lightweight portability and light gathering ability. William Optics z61 with field flattener. Features. Click on the pics for a larger image. The Astro-Tech AT60EDP Astrograph offers fully multicoated optics and all lenses have the latest state-of-the-art antireflection multicoating’s matched to their glass types on all air-to-glass surfaces for high light transmission and excellent contrast. 5mm and extension tubes will not be required. Astro-Tech astrotech 60mm Imaging Cameras ZWO ASI1600MM COOL Mounts iOptron iEQ45 Pro Filters Astronomik Blue 31mm · Astronomik Green 31mm · Astronomik Red 31mm · Astronomik Lum 31mm · Astronomik H-Alpha 6nm Accessories Astro-Tech 0. Resolution Formula: ( Pixel Size / Telescope Focal Length ) X 206. It will cost $90 or so more than the AT with shipping, but it’s in stock and they are a great company to deal with. Its apochromatic refractor design ensures that you get high-quality, clear images with minimal chromatic aberration. Astro-Tech Product #: AT60GS . Set it up once and it will stay in focus forever! Altair GPCAM Guide Camera with an extremely sensitive GPCAM AR0130 Mono sensor connects directly to the MG32 Mini Guider. Buy telescopes and telescope accessories at Astronomics. I was initially considering the Orion 80ED, but the focal length is a little longer than I would like and I dont like the focuser. The main lesson seems to be, however, that if an apo doesn't show a textbook star test then it isn't necessarily a sign of a problem. This is markedly higher reflectivity than the 88% of a conventional aluminum diagonal or the 96-97%. For the Astro-Tech Field Flattener the optimal spacing from field flattener to film plane: 57mm +/- 4mm and Canon is supposed to be 55. Although designed primarily for use with the new Astro-Tech AT60EDT triplet apo refractor, and priced at only $119. Astro-tech 60ED with FPL53 glass (like new condition) Astro-tech . Add To Cart. 5mm and extension tubes will not be required. Posted 23 May 2019 - 11:05 AM. No nicks or marks on any part of the telescope. The flattener produces wonderful flat fields as well as a 41mm image circle. VAT) Altair 70 EDQ-R F5 Quad APO Astrograph £1,150. Feel free to make a contribution! Learn more. . A self-storing retractable dew shield slows the. If you can't wait, or want to know more about it, its the same thing as the TS 80mm F7 doublet. Mount Type: Two 1/4-20 threaded holes on foot with spacing between holes: 30mm. This is my first impressions shortly after receiving the telescope. These mount holes are 20mm apart, is this a standard size, or do I. The difference in price is $399 for the Astro-Tech and $450 for the Orion. Win some, lose some. 8X Reducer for 60ED (ATRF60) AstroBin's equipment database is entirely maintained by the community. 8x Reducer Flattener for Astrophotography. Brands / Companies 925 ; Cameras 3311 ; Sensors 465 ; Telescopes & lenses 3753 ; Mounts 613 ; Filters 2238 ; Accessories 1410 . While the Astro Tech 66 is no competition for the hight priced / higher quality true APO’s, you will get very pleasing images both visually and with CCD / DSLR cameras. 130 mm. The images from its fully-multicoated ED (Extra-low Dispersion glass element) air-spaced doublet optics are virtually free of the annoying violet haloes of chromatic aberration (spurious color) that are typically seen around the Moon, planets, and bright stars in. 67 / 5 ) $ 770. 00 Not FPL-53. 800-422-7876. I hope you guys will like it. Astro-Tech 60ED vs. The flattener is threaded for attachment to the telescope via a 54mm metric thread. Astro-tech 60ED FPL53 glass wide FOV imaging setup. 25" brass compression ring eyepiece holders. Deep sky object photographic data courtesy: DSS/STScI. This Astro-Tech AT102ED refractor has: • 102mm f/7 fully multicoated doublet optics using FK-61 ED glass. ? Basically, as my first proper scope, is it worth to spend that $100? I also. Fun to view with. It is compact, well made with a rotating two speed Crayford focuser, a sliding dewshield and nice overall finish. Its fully multi-coated optics provide bright, clear images that are free from distortion and color. FocusKnobs. A super portable refractor telescope with FCD100 ED glass, suitable for astrophotography or visual use, day or night-time. Page 1 of 3 - Orion 80mm ED APO Refractor v. Takahashi FOA 60Q *Like New* 11/10/2023 05:03PM. My Astro-Tech AT80 arrived on Wednesday, along with the Astro-Tech 2-inch Dielectric diagonal. → Astrophotography and Sketching. Yeah, that's cutting the illumination circle a bit, but so what. Orion 2” 38mm superwide eyepiece. 8x Reducer. VAT) Sky-Watcher Esprit 100 ED PRO OTA £1,799. Alan Hancox. 60ED APO F/6 The new 60ED APO telescope from Sky Rover has excellent optics, a small and portable body, weighing less than two kilograms, so that you can travel to observe and photograph, no longer physical work, better enjoy the stars. Seeing, focus and the mount will do more for better image quality than splitting hairs to justify spending double. I am. Pocket prep for now. • dual-speed 2" Rack and Pinion focuser with built in rotator. Page 1 of 2 - Astro-Tech 102ED - posted in Refractors : So after trying many scopes for my grab and go setup i arrived to this oneThermals are no issue which i love and ready to go pretty much instant, has a good WF and can do some nice planetaryIve had it out only once but was pretty impressed so far having a peak at Jupiter, Saturn and a few. The new Astro-Tech AT102EDL is an extension of the beloved 60ED and 72EDII. Some dust on the lens front surface. Replacing the foam in an old Astro-Physics telescope case. Manufacturer. Focal lengths are 560. While this Astro-Tech #ATR8 0. Optics Type: ED FPL-53 Refractor. 80mm. buy DETAILS *Special offer while stock lasts * The Astro Fi 6" is a computerized alt-azimuth Schmidt Cassegrain telescope perfect for terrestrial and celestial viewing on the go. So, subtract the thickness of the t-ring from 9. $139. I have been very impressed with my modest optics thus far and have. $60. . 1-800-422-7876 questions@astronomics. ASTRO-TECH 60MM PHOTOGUIDE REFRACTOR "The new Astro-Tech AT60GS 60mm guidescope with upgraded helical focuser makes highly accurate autoguiding of deep space astrophotos affordable for any astrophotographer. The AT70ED's focuser can handle a binoviewer much better. Precision Locking Focuser for Auto Guiding with Starwave 60ED Refractor £99. It has dual mounting rings with nylon-tipped collimation screws (three per ring). The Astro-Tech 1. 20. Canon 100-400 IS I vs. 8x reducer you get a fast flat field astrograph operating at f/4. It seems like it’s similar, and yet quite a different design than their. This uses the FB shoe and has a machined adapter that attaches it to the top of a 1" wide telescope mounting ring. For Sale. 8X reducer/field flattener is designed for prime focus astrophotography with the Astro-Tech AT72EDII, it will work with other variants of the same optical tube. For the Astro-Tech Reducer/Flattener the spacing is 55mm with image circle of 42mm. And since we're a family business, we plan on being. Astro-Physics. The Altair Astro Starwave ASCENT 70 ED is a solid option for travel and wide-field astrophotography. The optical tube measures 9. Page 1 of 2 - Yet another rebranded Sharpstar 60ED available now - posted in Refractors : I got an email from High Point today talking about a new Apertura 60mm f/6 FPL-53 doublet that looks exactly like the Sharpstar 60mm which is currently being sold with branding from Astro-Tech, Teleskop-Service, Altair Astro, and William. . This version has the rack and pinion focuser, and optional guide scope clamp for imaging. This finder shoe is designed to work on a variety of Astro-Tech telescopes. Product Details. • 2" and 1. Astro-Tech 60ED Unboxed Equipment Discussions. Don't have an Astromart account? Click here to create one. The new 80EDL is a doublet and F/7. The telescope-side barrel is threaded for standard 2″ filters so you can attach a light pollution filter. Formal-Garden-7412 •. AT60EDP Then I. Astro-Tech 60ED Unboxed Equipment Discussions. New Scope Review: AT102ED. " . NEW V3 with X-Rings, Top. . Focuser: 2" Rack & Pinion with 10-to-1 Microfocus. I have stacked CR2 files in sequator without problems, so that shouldnt be your problem atleast. I've never used it, but it looks like you need to use the Ocean OmniDriver to access the QEPro from LabVIEW. ASTRO-TECH AT60EDP 60MM F/5 DUAL ED PETZVAL OTA - posted in Refractors : I saw this for sale on the Astronomics website today. I am selling my Astro-Tech 60ed + . 5 Jaegers refractor. 25" (260mm) wide, and 11. 5. I would get an Erect Image Diagonal for correct terrestrial viewing. This is in superb condition having been used on only a few occasions. Askar FRA300 f/5. Canon 100-400 IS I vs. You got the $$ differences. The Astro-Tech ATRF60 0. It is not too heavy and gives you a focal length of 288mm. Sharpstar 60ED Astronomical Telescope $366 / $436 with Flattener. Altair Starwave 60ED AstroBin's equipment database is entirely maintained by the community. Leo Triplet NGC 3628, M66, M65. The Orion version uses FPL 53 glass but has a cheap focuser. 00 usd. 0. So, no DSLRs with the Evoguide and at the moment, there is no way around this. Im looking for a 300mm vintage lens or more but. It will cost $90 or so more than the AT with shipping, but it’s in stock and they are a great company to deal with. Here are some Borg 60ED images resulting from a Google search :-Gary Honis-modified Canon XS(D1000), Hutech 60ED F3. The Astro-Tech AT60EDT is a superb grab-and-go visual scope, a fine wide-field astrograph, and a daytime spotting scope. I purchased a Borg 60 ED this week which arrived today. Therefore, you need to fill in (37. 8x reducer/flattener, both of which are backordered, or should I splurge for the twice as expensive William Optics Z61 plus their 0. The 72 is half the price for only 10% less aperture. Do I need a reducer/flattener? - posted in Beginning Deep Sky Imaging: Hi there I just purchased an Astro Tech AT60ED 60MM F/6 FPL-53ED doublet to do Astrophotography with my ioptron Skyguider Pro. 95. The Starwave 60ED is super compact with a modular design. Place your astronomy ads, read the latest news articles and check out the current reviews of newest telescopes and equipment. 10" Saddle Plate for Both D-Style and V-Style Bars (DOVEDV10) $240. You can image objects like the Heart nebula, Andromeda galaxy, Veil nebula and many more. Astro-Tech Product #: AT60GS . The AT 115 is coming into the U. 975, but. ready for shipping in 24 h. Its tube is. But the William Optics costs $169 more. Those who can afford a full-frame astro camera can afford an FSQ. Edited by james7ca, 02 June 2015 - 05:54 AM. 1 lbs: Keep in mind, the weight of these configurations will vary depending on the exact camera body you are using, and does not include any extra weight such as field flatteners, filters, or guide telescopes. Both have FPL-53 glass. UPC. Astro-Tech AT60ED and AT72EDII Black Friday Sale; Universal Astro Sale; Various Used and Demo Scopes and Mounts; Astro-Tech College Tuition Sale; iOptron 20% Off Sale. Sears 60mm x 700mm "Discoverer" (Towa) achromat, circa 1968, vs. ZW Optical. When Thomas passed away, Astronomics, continued in their support of his family. 50 (ex. Bahtinov Focus Mask for Telescope - Astro Tech 60ED SLIDE ON. Telescope N 150/750 Star Discovery P1 50i SynScan WiFi GoTo. The 2 inch focuser is extremely smooth and every screw has the non-mar clamping rings so. Astro-Tech . $699 A little longer FL than the Astrotech and one less element of glass to offset the weight of a 2" diagonal. The Starwave 60ED becomes a fast astrograph at F4. I purchased one, but it is back ordered till February. 8x CCD Telecompressor for 92mm Stowaway and 105mm Traveler. 5, this telescope provides fast light-gathering. Telescope Express TS Photoline 60mm f/6 is the same scope as the AT60ED, but a different color. The back focus is 55mm from the shoulder of the reducer to the. 8X reducer/field flattener is designed for prime focus astrophotography. 00. barx1963. I was hoping to do this first light video of my Astro-Tech AT60ED after I got my flattener/reducer, however they just haven't been in stock. The important perfomance updates come in the type of ED element combination and the type of foucser the AT125EDL is built around. View. It not only has great reviews, has FPL-53ED glass, and a clear price advantage. Astro-Tech 60ED. 5 inch rack and pinion focuser addresses what was the only weak point in some of the first AT-102EDs. According to Aperturas website, the flattener should be set to 3mm for the. 8x Reducer Field Flattener For the 60ED ? Clear Skies !! Back to top #6 Jaimo! Jaimo! I'm just stunned!. VAT) Sky-Watcher Esprit 120ED PRO OTA £2,499. So, do I: --wait 3 months for. Astro-Tech AT60ED 60mm f/6 FPL-53 ED Doublet $369. It is high profile to look over the tube rings. This Astro-Tech AT60EDT ED triplet refractor has: • 60mm f/7 fully multicoated apochromatic ED triplet refractor optics. Beautiful TAKAHASHI FC-76 MC APO OTA (76/600mm) w/6x30 finder & clamshell. For visual I would go for at least 80mm, but if you have $$ 100mm ED/ APO is what you really want for visual. More focuser will be supported in the further. Posts: 711. The new Astro-Tech ATR8 2" 0. It combines solid build quality, good looks, and high-quality optics in one relatively inexpensive package. This will be my step toward eventually purchasing an EQ6 R Pro later this year. Guidescope Suitability Calculator. You can still get good images, but you would need to. Sure there is another one also out there. Celestron 2” xcel 5mm ocular $50. Takahashi FOA 60Q *Like New* 11/10/2023 05:03PM. I am selling a very nice sample of AT 60ED doublet APO. In summary, we are using Nyquist as a starting point, with a slight tweak, because we are typically sampling very small, circular, stars. 5 set up with an efl of 950mm. This is a great little portable package. Aperture: 60mm. I would get an Erect Image Diagonal for correct terrestrial viewing. The Astro-Tech handle is not only nice to look at, it is extremely useful as it performs double duty. 8x Reducer / Adjustable Field Flattener for GT71, GT81, Z81 & Z103. Contact Us. Inside the cap is a wheel that can be rotated to either line up the Bahtinov. ( 3. 8lb apertura 60mm 3. And since we're a family business, we plan on being. Astrophotography is better when you use several programs to control the mount, control the camera, perform active guiding, etc. Feel free to give us a call if you have a question about your scope if it isn’t an Astro-Tech product. I have for sale a near new, recent vintage Astro-Tech AT60ED. ·. This l. Loc: Georgia. 8X reducer/field flattener is designed for prime focus astrophotography with quality f/6 focal ratio apo refractors such as the Astro-Tech AT72ED and AT130 apo, it will also work well with Astro-Tech and other brand refractors in the f/5.