Forums - AstroBin

New to AstroBin? Discover how we help astrophotographers share and preserve their work. Learn more

Three Scopes on Comet C/2025 A6 (Lemmon) Mosaic, Evening of October 19 2025local by Dan Bartlett

Optical correctors that flatten the telescope's field of view.

Showing 1-50 of 95

	Replies	Views	Created
Celestron C8 Equipment Flattener Reflectors +2 Rainer EhlertFrequent contributor Last post: andrea tasselli	1	50	Dec 1, 2025
Question about Wanderer ETA and multi-night registration Aries Productions Astro Pixel Processor (APP)Flattener Registration +1 jpsc01 Last post: jpsc01	8	233	Aug 31, 2025
Can a corrector be wrong ? Flattener Equipment Troubleshooting +1 PierreG Last post: AstrophotoMarket.com	8	457	Jul 22, 2025
External focuser respecting the rear flange to sensor distance mentioned by Celestron ??? Celestron EdgeHD 8"Focuser Flattener Paulo de Almeida Last post: John Hayes	14	253	Jun 11, 2025
Looking for comments on DeepSkyDad OFP2... in breezy conditions. DeepSkyDad Observatory Flat Panel (OFP2)Takahashi TOA-130 Equipment +1 Jeff Herman Last post: Jeff Herman	1	80	Jun 7, 2025
Anyone using this with a 120mm f/7.5 OTA? TS-Optics TSFlat25koll Flattener Help Needed Bob ten Berge Last post: Bob ten Berge	2	128	May 26, 2025
Value of a used William Optics FLT 110 DDG Triplet APO William Optics Fluorostar 110 / FLT110 (DDG)Refractors Flattener Dcolam Last post: Tim Hawkes	10	342	Apr 7, 2025
IMAGING WITH C11-CORRECTOR SUGGESTION Celestron C11 Reducer Flattener Filippo Bonfante Last post: Filippo Bonfante	7	179	Mar 1, 2025
How can I improve star shapes? Explore Scientific ED APO 127mm f/7.5 FCD-100 CF HEX ZWO ASI1600MM COOL Flattener +1 Arpad R Last post: Karl Perera	19	495	Jan 28, 2025
Back focus issue? Stellarvue SVX130T Optolong L-Ultimate ZWO ASI2600MC Pro +2 NeilM Last post: NeilM	7	257	Jan 19, 2025
Askar 130 PHQ field Flattener Askar 130PHQ Flattener Focuser Jerry Gerber Last post: Ashraf AbuSara	9	231	Jan 13, 2025
Mixed filter thicknesses and SW esprit 100 and asi2600mm ZWO ASI2600MM Pro Equipment Filters +1 Mark Crawford Last post: Sergey Rakov	7	166	Nov 22, 2024
Need help with same smudge pattern in flats with all filters Stellarvue SVX102T Flattener Acquisition +2 Robert Lowenthal Last post: Tony Gondola	8	136	Oct 21, 2024
Achieving a flat field when using the x0.7 Reducer Celestron EdgeHD 9.25"Russell Croman Astrophotography BlurXTerminator Flattener +1 Chris Ashford Last post: Mark Fox	22	638	Sep 14, 2024
Back Focus Svbony SV550 122 EDT SVBony SV550 122mm Triplet APO Flattener Refractors Michael Leslie Last post: Herbert W Hamber	3	219	Aug 17, 2024
Does anyone have data with bad distortion, like coma in the outer edges? (doing a test) Flattener Processing Beginner +1 Oscar H.	0	96	Jun 9, 2024
56.2mm backfocus Takahashi FSQ-85EDX Refractors Flattener ZoboZodiac Last post: Willem Jan Drijfhout	5	241	Jun 9, 2024
Newbie question: Telescope --> Reducer -> Flattener -> Filter --> Camera ... Distance & backfocus mess ?!? Equipment Flattener Reducer Joerg Last post: Tim Ray	14	278	Mar 17, 2024
Stars.. is the field really flat? William Optics Redcat 71 Flattener Roberto Testi Last post: Mark Killion	16	499	Mar 8, 2024
Help Finding Field Flattener Equipment Flattener Buying Advice Alien_Enthusiast Last post: Sean Mc	17	301	Feb 25, 2024
Testing my new 115/800 with a Barlow Sky-Watcher EQ6-R Pro Equipment Refractors +2 Carlo Paschetto Last post: Carlo Paschetto	4	115	Feb 13, 2024
Filter position and back focus topic Equipment Filters Flattener Tareq Abdulla Last post: Tareq Abdulla	4	166	Feb 10, 2024
Field flattener to camera distance, positioning the filter wheel correctly & what do I need? Equipment Flattener Filter Wheel +1 shaun mckiernan Last post: shaun mckiernan	2	189	Feb 1, 2024
Have i purchased a bad field flattener? Optical Vision Ltd (OVL) Field Flattener Canon EOS 600D / Rebel T3i / Kiss X5 Flattener +2 Maltasar_ Last post: Valter Reis \| Observatório Astronómico dos Reis-OAR	9	413	Nov 26, 2023
Zenithstar 61 Backspacing with Cooled Camera William Optics ZenithStar 61 / ZS61 William Optics Flat61A ZWO ASI533MC +2 Mark Germani Last post: Hans-Joachim Schmid	15	556	Nov 14, 2023
Williams 71 gt with rotator back focus William Optics Gran Turismo 71 / GT71 ZWO EAF Rotator +1 Dan Kearl Last post: Pariah	5	340	Nov 14, 2023
Flat files showing "central obstruction" of Skywatcher 130PDS Sky-Watcher Explorer 130PDS ZWO ASI533MM Flattener +1 Kristof Vandebeek Last post: andrea tasselli	4	277	Nov 12, 2023
C8, Baader focuser and a Starizona SCT corrector Equipment Flattener Reducer Mike H - Sky View Observatory Last post: Lynn K	7	226	Nov 5, 2023
Back-focus with Z4 Sharpstar Z4 Flattener Coma Andrew Rambaut Last post: Leah Deckard Hallett	8	380	Oct 27, 2023
Skywatcher 0.9x coma corrector Sky-Watcher 0.9x Coma Corrector Flattener Plate Solving Alan Hancox Last post: Alan Hancox	3	213	Oct 4, 2023
Refractor and field flattener Planetary Camera Flattener Acquisition +1 Marc Last post: andrea tasselli	1	154	Oct 4, 2023
BACK FOCUS ISSUE - Williams Optics FLT91 William Optics Fluorostar 91 / FLT91 William Optics Flat6A III Flattener +2 Ivan M Last post: SemiPro	14	518	Sep 29, 2023
RC8 question Equipment Flattener Alan Hancox Last post: Reg Pratt	7	203	Sep 27, 2023
New fra400 any tips from owners? Askar FRA400 QHYCCD QHY268 M Refractors +1 RammaN Last post: Matt Simmons	3	370	Sep 24, 2023
New scope and flattener/reducer William Optics Fluorostar 91 / FLT91 ZWO ASI294MC Pro Flattener +2 Shane Last post: Sean Mc	10	427	Sep 12, 2023
Backfocus calculation William Optics ZenithStar 73 / ZS73 Refractors Flattener Ewen Charlton Last post: Taman	3	247	Aug 19, 2023
What difference would a triplet make? ZWO ASI2600MC Pro Equipment Refractors +1 Piers Palmer Last post: enta	30	1.5k	Aug 18, 2023
Zenithstar 73- Are these stars bloating or I'm too picky again? William Optics ZenithStar 73iii / ZS73iii QHYCCD QHY183C Refractors +1 Ferenc Szabo Last post: dkamen	20	1.1k	Aug 13, 2023
ZWO OAG-L + 31mm filter wheel ZWO ASI294MM Equipment Flattener noon	0	88	Jul 10, 2023
Are Reducer/flattener "universal" for any refractor with the same focale length? Sky-Watcher Esprit 120ED Reducer Flattener +1 Stephane Perroud Last post: Tony Gondola	14	691	Jun 29, 2023
What's in the box? Sky-Watcher Esprit 120ED Refractors Flattener borko Last post: Frank Alvaro	7	357	Jun 18, 2023
Tilt problem? Canon EOS 6D Flattener Acquisition +2 l.roulin Last post: l.roulin	4	293	May 20, 2023
How to achieve 'perfectly flat' field with WO Z61A field flattener and DSLR? Nikon D5300 Equipment Flattener +1 Photon_Collector Last post: Jens	4	343	May 16, 2023
SVX102T and full frame sensors Stellarvue SVX102T-R Flattener Vignetting Nick Grundy Last post: Dale Penkala	4	365	Apr 25, 2023
Separating overtightened spacers in optical trains? Equipment Flattener Tim Hawkes Last post: Arun H	19	795	Apr 17, 2023
Ts Optics (or rebranded) maxfield 0.95 coma corrector TS-Optics 2" Maxfield Newtonian Coma Corrector 0.95x (TSKomaKorr)Reflectors Flattener Dave B Last post: Werner Stumpferl	14	855	Apr 8, 2023
TS Optics Photoline 80mm F6 APO and TSFLAT2 TS-Optics TSFlat2 Equipment Flattener +1 lensflaredk Last post: Flemming Kristensen	22	914	Jan 29, 2023
Inverse Lighthouse Beam Effect on Bright Stars with Tak FSQ 85-EDX ZWO ASI6200MM Pro Equipment Flattener +1 Bruce Donzanti Last post: dkamen	19	1.4k	Jan 9, 2023
Can someone help me interpret these? ZWO ASI2600MC Pro Flattener Processing +2 Piers Palmer Last post: Piers Palmer	3	393	Dec 30, 2022
Some problem with flattener Equipment Flattener Troubleshooting +1 Michele Campini Last post: Michele Campini	5	362	Dec 4, 2022

Showing 1-50 of 95