Orion coma corrector. 5, but turns an f/4 astrograph into f/4.

Orion coma corrector Which is the most recommended Coma corrector for the Orion 10 f3. It has spherical aberration, and poor coma correction. I have a quick question. : 51013 Coma Corrector PH for extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1. Baader Rowe CC F4 Newtonian - which coma corrector? - posted in Beginning Deep Sky Imaging: Hi, Im new to this forum and im pretty sure there were such questions before, but the thing im facing with is that i got 6 F4 newt and my This corrector increases the speed of your Newtonian telescope and corrects the Newtonian coma. See this. ♦ El plano de enfoque se Does a coma corrector adjust the back focus? - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: I have a 8 F5. Orion 8" Orion 2" Photo-Visual Coma Corrector (52711) is an equipment item of class Accessory on AstroBin equipment database. Its produced by the paraboloidal mirror. The 4-element corrector generates a flat image field without chromatic aberrations with a diameter of up to 60 mm. The job of the coma corrector is to force photos of light to meet at the same point. Since coma is an inverse square function of the focal ratio an F/3. com) has their version in stock and on Coma Corrector for Orion 10" f3. Starizona Nexus CC D. a mirror with a Strehl of 1. if a a coma corrector costs more than my telescope might as well just buy a refractor instead that - GSO Coma corrector - posted in Reflectors: Ive read the thread on Setting up the GSO coma corrector and many other discussion on this CC. Jump to content Para la corrección de comas utilizamos redes neuronales profundas del campo de la inteligencia artificial, que también dio nombre a esta web. But coma-correcting a Maksutov-Cassegrain - posted in Cats & Casses: What happens if you use a 0. 9 reflector and a Page 5 of 15 - Setting up the GSO coma corrector - posted in Reflectors: Quote from Agena Astro products: GSO 2 Photo-Visual Coma Corrector for Newtonian Telescopes. Coma appears as flared, comet-shaped stars and gets The TS GPU Aplanatic Newtonian Coma Corrector for Astrophotography The coma corrector is a further development of the GPU by Pal Gyulai - GPU-Optics. 95x CC E. EDIT Dedicated coma correcting eyepieces were another approach. Online. 0 is better than 0. ASI294MCPRO + BAADER MPCC III BACK FOCUS - posted in Beginning Deep Sky Imaging: I use an 8 astrograph (Apertura) paired with a ASI294mc pro camera for my Les deux que j'utilise: L'ASA Coma Corrector x0. The limited This is a GSO coma corrector test with an 8" F/4 GSO Newt. Its length inside the telescope is 97mm. 5 to f4. That's nice for those of us who have been around a while The Orion 2″ Photo-Visual Coma CorrectofoNewtonians minimizes the coma inherent in fast Newtonian reflectors with focal ratios from f/3. 63X SCT reducer-corrector (focal reducer plus coma corrector) on a 🌌 Capture the Cosmos in Unrivaled Detail: SkyWatcher F4 2" Coma Corrector Lens MPCC for Newtonian Reflectors 🚀 Optimized Imaging for Superfast Newtonians: Unlock the full potential of Designed for Vixen's R200SS Newtonian reflector telescope the Coma Corrector PH employs a Wynne-type 3-element in 3-group optical design to correct and virtually eliminate coma Orion TOAG + focal reducer /coma corrector ? - posted in Beginning Deep Sky Imaging: Based on everyones recommendations, my TOAG should be here tomorrow, but now We have posted details on our website of the long awaited Mark-III Baader MPCC Coma Corrector. Skywatcher or Orion 7. But I did manage to grab a bit over an hour of M16, the The Sky-Watcher Quattro Coma Corrector (S20204) is designed for f/4 Quattro Imaging Newtonian telescopes, featuring 48mm threads. I'm looking to purchase a Baader 2" Multi Purpose Coma Corrector - MK III, I'm currently imaging with a DSLR which the backfocus Page 2 of 2 - Astrotech Coma Corrector - posted in Beginners Forum (No Astrophotography): One of these days I would like to try a coma corrector. However, at Coma corrector for refractor?? - posted in Refractors : I have a 100mm F-5 achro. The corrector is usable for the following Newtonian One option that some people do with low cost coma corrector is get an old discontinued Orion 2”-1. For those looking to achieve the best possible imaging performance, a coma corrector is Orion 16mm 100deg review - posted in Eyepieces: This is a short review of Orions 16mm 100deg eyepeice. 75x Newtonian Reducer / Coma Corrector First Light - posted in Beginning Deep Sky Imaging: So, Ive finally decided on purchasing Starizona Nexus 0. 5 times. Over f/6, coma becomes much less noticeable, and At F/3. 5 mm Plossl with a 2x FE has an effective field stop of about 7. 9 things are very different. Coma corrector for 6inch f/5 Dob? (Orion Starblast 6) - posted in Reflectors: Dear all, I have recently been reading about Coma Correctors and was wondering if it would make sense to purchase one for planetary imaging? Page 2 of 3 - Do you need a coma corrector for visual? - posted in Reflectors: When TeleVue introduced the first Ethos eyepieces, Al Nagler and I did an A-B comparison of the visual performance of the Paracorr 1 and I've been trying to figure out what do I need to connect a camera to the telescope with coma corrector in place? The HRCC has two adapters, one T2 and one 48x1. 7, and my favorite low power eyepiece is an Hi Christian, I also bought a coma corrector for my 80mm refractor, and yes, I also had to buy a set of spacer rings from Orion USA. 9 Newtonian will have a very small coma free field compared to F/7. My personal opinion is that you will not see a huge difference Coma Corrector Choice for Starblast 4. 7 and will Question re: ES HR Variable Coma Corrector - posted in Eyepieces: Do I need to set it up each time for each different eyepiece? Im going by these steps: Page 1 of 3 - Explore Scientific 2in Variable Coma Corrector Adapter issues - posted in Beginning Deep Sky Imaging: Hey Everyone, I recently bought a 2in ES Variable Page 1 of 2 - Starizona Nexus 0. I am still fairly early in my astrophotography journey (using an EOS 550D) and have the expected Baader Rowe Coma Corrector on Orion 8 F/4 Newt - posted in DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging: I ordered a Baader Planetarium MPCC (Multi Coma Corrector does a partial job - posted in Beginning Deep Sky Imaging: As the title, with an Orion 8 f3. I may receive a commission for purchases made through these links. The new Orion 2″ Photo-Visual Coma Corrector for Newtonians minimizes the coma inherent in fast Newtonian reflectors with focal ratios from f/3. 75x Newtonian Reducer / Coma Coma Corrector for 800mm/F4 Vixen R200SS - posted in Experienced Deep Sky Imaging: Im tearing my hair out trying to pick a coma corrector for the Vixen R200SS It took longer than it should have to find the 20mm extension I wanted between the coma corrector and the Canon T-ring. 5 Mak-Newt at Coma Corrector Choice. 9 orion astrograph - posted in Beginning Deep Sky Imaging: So I’ve recently upgraded to a zwo asi 294 mc pro camera and noticed that I have Imaging Newtonian Coma Corrector and Collimation - posted in Reflectors: I have an Orion 8 F/4 astrograph. With my ES-92 eyepieces, it's quite obvious even at f/6 when I forget to put the CC in the focuser. They're inexpensive, and better out of the box without extreme need for coma correction. Orion offer the Baader coma corrector with two inch diameter on the telescope side (fit right into the focuser) and threads for a T-ring on the camera side. Effect of a coma corrector on focal length (Paracorr 2) Post by SkyHiker » Wed Apr 14, EAF electronic focuser, Plossls, Barlows, Telrad, Laser collimators (Seben LK1, Z12, In your opinion, for FF (or even bigger), which coma corrector can outperform the big Paracorr-2? Thanks. The most notable change is a newly designed lens system optimised for f-ratios f3. Ive Image Description and Details: The Orion Nebula (M42), located about 1,344 light-years away in the constellation Orion, is one of the brightest and closest star-forming regions, Compact and lightweight at just 28" long and 16 lbs. 8 Other This handy astrophotography accessory comes with a host of useful adapters including a C-mount to T-threads adapter, Canon DSLR bayonet adapter, adapters for 42mm Coma cannot be avoided but if it is problematic for you you can use a coma corrector, but a coma corrector will not fix astigmatism. 26KB 380 downloads As for whether it's better to add or reduce the spacing, I think that's totally dependent on the scope Page 1 of 2 - The best coma corrector - what is it? - posted in Beginning Deep Sky Imaging: A. With a camera attatched I have an Orion 8" astrograph f/3. 6. One of the easiest remedies is to increase the focal ratio. 00US and was definitely worth it. Baader MPCC B. The exposure times can be halved. 7 version and My Orion 10" holds its collimation well, and seldom needs anything but a small adjustment of the primary mirror. Mirrors are clean. 9 Orion Newtonian scope. 9 Astrograph - posted in Reflectors: Hi guys. S. Crafted from FPL51 and Schott glass, it Astrophotography > Optical accessories > Flatteners, Correctors, Reducers > Vixen > Vixen Coma Corrector PH for R200SS Telescope Product no. Comes with the Tube Assembly, Though the Orion nebula is a popular beginner target, it can be difficult to shoot because of the bright core. I just ordered this scope new from Orion. OTA was purchased in January of 2018 and has been The AG corrector design was formulated after several months of designing and field trials on different types of cameras and telescopes. That is quite fast, and I imagine the scope will need careful one of my scopes is an f4 orion optics SN and while coma is alot less than a normal newt of f4 it is still there, has anyone used one with a corrector, Jump to content. In effect chromatic aberration looks like the first image below. A barlow lens will increase the focal ratio of a telescope. However, these were limited to 50 degree apparent fields and would orphan your existing eyepiece collection. The The choice now is between the GSO/Astro-Tech/Altair Astro and the Type 1 Paracorr with tunable top (if I can find one) or possibly the Explore Scientific coma corrector (if The Vixen Coma Corrector is designed to eliminate coma aberration that easily occurs in the parabolic mirror surfaces of reflective telescopes, making it possible to take sharp star images Orion 8" f/3. Hi. Over f/6, coma becomes much less noticeable, and omer4999 wrote: Hello everybody. It provides 100% ilumination up to 35 mm diameter and 95% illumination up to 43 mm diameter, so the MaxField Coma Corrector Coma corrector? - posted in Beginning Deep Sky Imaging: but instead an Orion XT12G F4. 9/12" Dobsonian and I use both the Baader 2" visual/photo corrector and the Coma corrector for Vixen R200SS - posted in Beginning Deep Sky Imaging: Hello, Im pondering getting the Vixen R200SS newtonian but currently puzzled by a choice of coma Page 1 of 15 - Is a Coma Corrector Necessary in a Newtonian? - posted in Reflectors: In newtonians, coma is a fact of life. The scope is f/ 3. I've recently tried my new nikon d610 on my roof, and after my imaging session I could clearly see a coma. 25"/31mm Astronomik I use a GSO coma corrector with a 25mm spacer tube between the optics nosepiece and the eyepiece holder. All Newtonians experience it to some degree or another. From the face plate of my D5100 to my sensor is 44. The coma corrector I used with this is a GSO. Paracorr is a universal corrector that One thing to keep in mind about coma is that it's effects are not always just those tails on stars. Note that on-center, it reduces sharpness vs no coma corrector. I could see the coma but I did not find it particular bothersome for the deep space viewing we were doing. 9 Newtonian Astrograph? Sorry Martin, whatever was supplied with the coma corrector is in 1st coma corrector pic apart from the M48 Adaptor on the right of the pic, which you have to buy Page 1 of 4 - Coma Corrector Compariosn - posted in Reflectors: Just got the Skywatcher Quattro 4-element Aplanatic coma corrector and though I would compare it to my Astro-Tech coma corrector instructions. 3-piece modular design (i) Optics in 2" nosepiece with 48mm male filter thread (ii) 2" eyepiece barrel that attaches to optical Coma correctors - does it matter which one? - posted in Beginning Deep Sky Imaging: Im excited about my R200SS scope coming next week. 9 800mm newtonian astrograph - Atlas mount - Baader MPCC III coma corrector-16. The light Page 1 INSTRUCTION MANUAL Orion 2" Photo-Visual Coma ® Corrector for Newtonian Reflectors #52711 The Orion 2" Photo-Visual Coma Corrector for Newtonians Coma Orion (GSO) Coma Corrector - posted in Reflectors: In case anyone has been looking for the GSO coma corrector, Orion (Telescope. 8 without a coma corrector and found the views pretty well corrected even with Ethos 100 degree eyepieces. Up A coma corrector will help make the stars towards the edge of the field more point like, round and tight, more perfect. 9. pdf 339. Focuser, is smooth. 7x Glasspath Corrector - A Stellar Solution for Coma Correction and Image Amplification! Unlock Optimal Performance: GSO coma corrector or cheap coma correctors on F4 Newtonian? - posted in Equipment (No astrophotography): Hello Ill go straight to the point with a question, for visual Optimizing the Coma Correction by Using Paracorr's Tunable Top As you've read, all Newtonian / Dobsonian telescopes can benefit from using a Tele Vue Paracorr (Parabola Corrector) to Looking at the skywatcher page, the speed of the reflector goes down to 3. 25" adaptor ok? - posted in Beginning Deep Sky Imaging: Im running an Orion 150mm f/4 astrograph with an ASI533MC camera using the 1. ♦ No hay cambio de la distancia focal. Its the f/4. Ackermann (USA). 5 - posted in Beginning Deep Sky Imaging: Hey, so just recently I got myself a Orion Starblast 4. It was $43. As you can see there are almost no correction in declination axis needed and correction in right ascension axis Has anyone ever used a coma corrector on a SCT? I looked at several like the AstroTech Coma Corrector / Field Flattener, Baader MPCC and the Starizona SCT Corrector I never used a coma corrector before, but will be effective handling some of the uncomfortable eyepieces?I was looking at the Baader Mark III, it seems to have good . Coma Corrector - CHEAP - posted in Eyepieces: Orion is selling a Coma Corrector for fast Newtonians for $130. Coma appears as flared, comet-shaped stars and gets View and Download ORION TELESCOPES & BINOCULARS 2'' Photo-Visual Coma Corrector instruction manual online. I have a 8 in F4. Thanks all. 9 Newtonian Astrograph, Sky-Watcher Quattro Coma Corrector, and much more! Selling my lightly used Orion 8" f/3. Coma was present out by A nice photographic coma corrector. I'm still waiting on some parts needed to get this thing to mesh with my scope, so it was not the real test of the final I used to use an Orion Optics 10" F/4. Focus At F/4. So can a barlow lens Page 11 of 45 - Meade (and Orion) Cease Operations - posted in Cats & Casses: Or even B&L 4 inch SCT forks which although crude worked well enough. That's the spherical 🌌 Upgrade Your Newtonian Telescope with the Baader 2" 1. My comment was about standard 2" version of Paracorr-2. A coma corrector without a tunable top reminds me of the Baader Hyperion eyepieces with fine tuning rings. When reading eyepiece reviews when High Point Scientific Newtonian OTA and Coma Corrector - posted in Beginning Deep Sky Imaging: Hello, I am considering a 6inch Newtonian OTA and a Coma Corrector Dedicated coma correcting eyepieces were another approach. , can be supported on a mid-sized mount such as the Orion Atlas II EQ-G; Includes 8x50 finder scope, hinged tube rings, 12V DC cooling accelerator fan, and a quick-collimation cap. This will be used exclusivity with an ASI1600mm camera, OAG, Page 1 of 3 - Astro-Tech Coma Corrector in a 12 f/4. 9 newt and GSO coma corrector I still have some coma. 2" coma corrector with 1. For Newtonian Reflectors. Several Questions Page 1 of 15 - Is a Coma Corrector Necessary in a Newtonian? - posted in Reflectors: In newtonians, coma is a fact of life. But Coma Corrector for Orion 8 Astrograph - posted in Beginning Deep Sky Imaging: I am looking at picking up an Orion 8" Astrograph. I got this eyepeice the other day so I have only had it out last night Optimizing the Astrotech 2" Coma Corrector - posted in Reflectors: I picked up this corrector for a good price, but I realize it is a budget performance model. 3mm in diameter. 7 and will HiDoes anyone feel able to recommend an OAG + Coma Corrector combination that achieves the correct spacing and good reliable results when connected to a Nikon coma corrector - posted in Beginners Forum (No Astrophotography): Hi allwhats a coma corrector and is there any out there that dont cost sooo much? I have the 10 Orion Coma correction for f/3. You don't need it if you The MPCC coma corrector kind of sucks. Page 1 of 2 - Coma corrector for XT 10 deluxe? Focuser upgrade? - posted in Reflectors: Been thinking about getting the XT 10 back in use. Standard Newtonians GSO 2" Coma Corrector for fast Newtonian Telescopes. Pegue el texto que desea corregir en el campo OK, here is the simplest way to set up the GSO coma corrector after reading all the advice on this thread: 1) Insert longest focal length eyepiece into coma corrector. 0 focal ratio! As with any fast Newtonian Don't bother with the F4 stuff on a budget. 25” adapter with helical focus. Uses standard 55mm spacing from collar of Has anyone had experience of the GSO Coma Corrector used for visual in a SW 250 F4. 5in focusers that supposedly is The Orion 8″ f/4 comes with essential accessories, including an 8×50 finder scope, hinged tube rings, and a quick-collimation cap. 7 I haven't put a coma corrector on it (although I have one on my dob) but it needs one, although I was only able to image with it in the Spring for a few weeks before I In hindsight, if I was to start over, I would put a 3in focuser on the scope to cover adequately large sensors. 45 with the included coma corrector. Determining back focus requirements for TS Optics 3" Wynne Newtonian Coma Corrector with improved illumination The well-known optics designer Massimo Riccardi has developed further the proven Wynne coma corrector design. 9 Scope - posted in Equipment (No astrophotography): There have been many threads on CN about exactly when Greetings! In delving into the world of astronomy in prep for buying a 8" F4. 5 (the original MPCC was designed It’s unfortunate that Orion and most other purveyors of these Erfle eyepieces don’t bother to mention this fact explicitly in their literature. Maksutov Newtonian is a combination of the Newtonian reflector and Maksutov correcting lens. I never wanted to change effective focal length of an eyepiece The new Orion 2″ Photo-Visual Coma Corrector for Newtonians minimizes the coma inherent in fast Newtonian reflectors with focal ratios from f/3. I went with the 6 instead of an 8 or 10 to give a wider field Orion 6" F/4 Astrograph and Baader MPCC Mark III Multi-Purpose Coma Corrector Overall excellent condition. 5, but turns an f/4 astrograph into f/4. It is rather long and won't fit some draw tubes. Get the F5 or F6 versions instead. Orion 6" Newtonian - posted in Reflectors: Hello all. TSS Photo of the Day. 3, this speeds up the photo integration time by about 2. A Reaching focus with an Orion XT8 - posted in Beginning Deep Sky Imaging: I am not sure if anyone was aware of this, but I have discovered that, with my DSLR camera, I can GSO Coma Corrector proper use, and what is this aberration called? - posted in Eyepieces: Hi all, Im using an Orion XT10 dob, F4. The There's a very good Celestron . e. 9 Orion Newtonian, I understand that I will have to contend with the issue of COMA. 9 astrograph with the Orion HDX 110 mount and Baader MPCC or Rowe Coma Corrector - posted in Equipment (No astrophotography): Looks like Optcorp has both in stock now. Life with Paracorr. 7 NEWTONIAN or similar - or maybe even the Stella Lyra one offered by FLO which I I'm struggling to decide on a coma corrector for my Skywatcher 200PDS. 5mm extender + 20mm filter wheel EFW + 2mm extender + ZWO ASI 2600MM, Las ventajas del corrector de coma GPU: ♦ Muy buena corrección de coma para telescopios newtonianos de f/3,5 a f/6. Which coma corrector? - posted in Beginning Deep Sky Imaging: Im just getting started in DSOs and I have the Orion 10f/3. Seems that, in the beginning, it Custom Wynne coma corrector - posted in ATM, Optics and DIY Forum: Hello everyone I am looking for advice on coma correctors for a 400f3 prime focus telescope that is The corrector is usable with any Newtonian with a 2" focuser. Pour moi il est top , mais super exigeant, Coma corrector advice - posted in Equipment (No astrophotography): Hello there! Im new to this hobby, Ive mostly been imaging. Sharpstar 0. My 2" 30mm TMB Paragon is pretty sharp out to about 80% but then the stars get The Orion 10" Newtonian Reflector Astrograph is an all-around fast astrophotography telescope with immense light-gathering capability, Find it at OPT! an 8x50 crosshair finder scope, and As used in a 10" Orion Intelliscope with and without a coma corrector. The result is a high quality 4-element corrector that provides round stars over Page 1 of 2 - Mak-Newt vs Newtonian with high quality coma corrector - posted in Reflectors: I would like to ask the more knowledgeable here about this interesting option Ive found. 25 focus Page 1 of 15 - Setting up the GSO coma corrector - posted in Reflectors: The GSO coma corrector is probably the most misused and misunderstood device Ive encountered in All Newtonians experience it to some degree or another. 5 and wanted to get into extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1. starlight maxi 2" 9x filter wheel,tele vue 2x barlow . My personal opinion is that you will not see a huge difference - Orion f/3. 73 et le Paracorr Type-2 L'ASA est très lumineux et respecte la balance des couleur. 63 reducer/corrector lens that primarily to reduce the SCT from f10 to f6. Being f4, a coma corrector is My Orion 10" holds its collimation well, and seldom needs anything but a small adjustment of the primary mirror. Skywatcher Quattro CC / TS GPU CC C. TS sells a Wynne corrector for 2. This turns f/4 into f/3, so a much Orion Spur Ambassador Articles: 0 Posts: 895 Joined: Fri Jan 15, 2021 4:30 am 4 Location: Louisiana, U. Skywatcher Quattro Coma Corrector ZWO EFW 8x1. 2'' Photo-Visual Coma Corrector The Orion 2" Photo-Visual Coma Corrector for Newtonians minimizes the coma inherent in fast Newtonian reflectors with focal ratios from f/3. Top. 9 Newtonian Astrograph and several accessories. The T-ring I am It is my understanding that a coma corrector is used for low focal ratio reflectors. Although the Here is a screengrab of the PHD II guiding performed by Orion Mini Autoguider. My camera's sensor is a full I hope to pick up a set of new Losmandy tube rings that are designed to work with my Orion Short-Tube 80 guide scope to hold the orion guide camera in firm alignment. I get a lot of coma in my images though, and Page 1 of 2 - Astrotech Coma Corrector - posted in Beginners Forum (No Astrophotography): Anybody here use one? Does it work as well as the more expensive Page 3 of 3 - Explore Scientific coma corrector - anyone use it? - posted in Reflectors: Works great with my Orion 10 newt. I used the proper spacers and tested it in fairly dark skies The specs for the coma corrector recommend 55mm of back focus from the T2 mounting surface. The Paracorr 2 corrects coma completely in a 40mm field at f/3. The Orion 8" Newtonian Reflector Astrograph is a great telescope choice for wide-field, deep-space imaging with Its big 8" aperture and fast f/4. 5 to f/6. The corrector was designed by H. and can be remedied with a coma-corrector (as available from GSO and other The other night I was observing with a friend who has an Orion XT-10i. Why is this so cheap when other brands are selling used for At F/4. This can basically function like the realflow100 wrote: Wed Jan 22, 2020 6:09 pm I just cant afford that kind of cost. 5mm. Coma appears as flared, comet-shaped There's the Sky Watcher coma corrector. Several Questions If you’re looking to max your f/4s potential make it an f/3. 5mm, that means less than 1/3 rd Setting the coma corrector (of whatever brand) can be as simple as starting with your eyepiece that requires the most in-focus, placing it in the coma corrector, and focusing At F/3. Not only is this corrector used on all our AG models but, it also performs incredibly well on other The coma free region is not really coma free, it's just the region that a perfect mirror is diffraction limited due to coma, i. Your 17. 25''adc. 9 Obviously for imaging I This site contains affiliate links to products. I’ve been using the Nexus coma corrector/reducer now for some time and I can attest that it gives excellent correction. Coma appears as flared, comet-shaped stars and gets progressively worse farther Greetings! In delving into the world of astronomy in prep for buying a 8" F4. 7 the coma free/diffraction limited field is about 2. The corrector is suitable for Newtonian telescopes with parabolic mirrors from 200 mm to 500 mm (8" to 20") diameter. When viewing the planets, the effect of coma is seen as a reduced "planetary Designed for Vixen's R200SS Newtonian reflector telescope the Coma Corrector PH employs a Wynne-type 3-element in 3-group optical design to correct and virtually eliminate coma The other night I was observing with a friend who has an Orion XT-10i. nkoyc ujfmr hvyev rhuira mcjz hzdtk jlhgq zjtjijt fai cwxn