Forums - AstroBin

NGC 7635 by Kristóf Vágenhoffer

Comet-shaped star distortions at image edges.

Showing 1-50 of 80

	Replies	Views	Created
QHY163C backfocus QHYCCD QHY163C Help Needed Coma Merco Last post: Kristof Vandebeek	1	29	Jun 23, 2025
Star shapes on Samyang 135mm Samyang 135mm T2.2 VDSLR MK2 Canon EOS 6D Tilt +1 Haakon Rasmussen Last post: Haakon Rasmussen	2	108	Jun 17, 2025
Sky-Watcher Quattro 250P - Collimation Issues Sky-Watcher Quattro 250P / 10-S Collimation Troubleshooting +1 Efimenco Vladimir Last post: Jeff Coldrey	15	417	Apr 27, 2025
How easy would this app be to develop? Reflectors Collimation Coma CraigT82 Last post: Tony Gondola	6	280	Apr 3, 2025
Coma Corrector Chromatic aberration Equipment Coma Artifacts Gabriel Wiklund Last post: Gabriel Wiklund	4	78	Mar 7, 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	484	Jan 28, 2025
Back focus issue? Stellarvue SVX130T Optolong L-Ultimate ZWO ASI2600MC Pro +2 NeilM Last post: NeilM	7	249	Jan 19, 2025
EdgeHD 9.25 + .7 reducer: elongated stars in one corner only Celestron EdgeHD 9.25"Equipment Tilt +1 Eyecon Last post: Jonathan Simmons	18	896	Nov 8, 2024
Artefacts near coma-corrected stars after applying "Correct only" in BlurXterminator Russell Croman Astrophotography BlurXTerminator Processing Artifacts +1 Drahomír Michalko Last post: andrea tasselli	16	712	Oct 24, 2024
Triangular stars on WO FLT 91 with 0.79x reducer. ZWO ASI6200MC Pro Refractors Acquisition +2 Harry Karamitsos Last post: Harry Karamitsos	8	310	Sep 30, 2024
Problem with M54 extender and coma corrector. Equipment Focuser Coma Raúl M. Last post: Raúl M.	2	138	Sep 16, 2024
0.95x coma corrector internal reflection problems? TS-Optics Maxfield .95X Coma Corrector Coma Artifacts Oscar Last post: Oscar	19	637	Aug 27, 2024
Connecting zwo 120mm mini to zwo 120/f4 ZWO ASI120MM Mini Tilt Coma TiffsAndAstro Last post: Christian Großmann	18	288	Aug 16, 2024
Poor starfield. Askar 0.6x reducer for 103APO NGC6960 Coma +2 Konstantin Last post: Konstantin	4	136	Jul 27, 2024
Conflicting tilt measurements results Pleiades Astrophoto PixInsight Equipment Tilt +2 Eyecon Last post: Josh Jones	9	207	Jul 15, 2024
Help with Coma Corrector Backspacing Equipment Reflectors DSLR +1 EvanSpiesTheHeavens Last post: Christian Großmann	4	92	Jul 9, 2024
Newt Astigmatism: tilt or secondary mirror? Equipment M101 Coma +2 Eyecon Last post: AstroShed	44	1.3k	May 24, 2024
Coma corrector suggestions for SkyWatcher 150PDS Sky-Watcher Explorer 150PDS Buying Advice Coma Menelaos Last post: Peter Graf	10	627	Apr 2, 2024
V-shaped stars in wide angle lens Nikon D5300 DSLR Coma Eclipse Last post: Nick Large	3	151	Mar 29, 2024
Weird star shape Samyang 135mm T2.2 VDSLR MK2 Canon EOS 6D Help Needed +1 Haakon Rasmussen Last post: Haakon Rasmussen	6	229	Feb 24, 2024
Coma corrector over correcting at 55mm back focus (Maxfield 0.95x) Sky-Watcher Explorer 130PDS Equipment Reflectors +2 mijajlo Last post: mijajlo	2	106	Feb 19, 2024
Another case of bad Samyang 135mm F/2 coma? Samyang 135mm F2.0 ED UMC Coma Deep Sky Carl Elgario Last post: BryanHudson	50	1.8k	Dec 10, 2023
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	412	Nov 26, 2023
Good coma corrector? Equipment Reflectors Coma Menelaos Last post: Alex G	15	562	Nov 11, 2023
Back-focus with Z4 Sharpstar Z4 Flattener Coma Andrew Rambaut Last post: Leah Deckard Hallett	8	373	Oct 27, 2023
ZWO T2 Tilter with MPCC iii coma corrector and DSLR ZWO T2 Tilter Tilt Coma Menelaos Last post: Philip F.	2	114	Sep 22, 2023
Collimation Problems Sky-Watcher Explorer 150PDS Reflectors Collimation +1 Menelaos Last post: Peter Graf	6	189	Sep 21, 2023
QHY 168C and coma correctors QHYCCD QHY168C Equipment Coma Alan Hancox Last post: andrea tasselli	3	135	Sep 14, 2023
Anyone have any experience with the Nikon 200-500mm lens or perhaps camera lenses in general? Nikon D850 DSLR Acquisition +2 Benjamin DeHaven Last post: Pavel Karas	12	636	Sep 12, 2023
Coma Corrector Baader 2" MPCC Mark III Newton Coma Corrector (2458400A)Reflectors Coma Menelaos Last post: Vroobel	11	474	Sep 7, 2023
Esprit 100 & Starizona 0.65 Reducer Sky-Watcher Esprit 100ED Reducer Coma Christian Schulbert Last post: Christian Schulbert	4	650	Sep 6, 2023
Help! i can't reach focus with my telescope Equipment Reflectors Coma Fernando Last post: andrea tasselli	2	268	Aug 31, 2023
Tilt! William Optics ZenithStar 61 / ZS61 ZWO EAF Tilt +2 Mark Germani Last post: Mark Germani	13	784	Aug 19, 2023
Focus with coma corrector Equipment Focuser Coma Christian Bennich Last post: andrea tasselli	19	288	May 18, 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
Colimation, tilt or????? Sky-Watcher Explorer 200PDS Equipment Coma +1 Christian Bennich Last post: gfunkernator	9	436	May 15, 2023
Advice on Coma Corrector and reducer Equipment Reflectors Coma Christian Bennich Last post: Dale Penkala	8	656	May 7, 2023
Should i use a Barlow lens instead of drizzling in lack of focus length and aperture? Acquisition Drizzle Deep Sky +1 Haakon Rasmussen Last post: Haakon Rasmussen	2	213	May 3, 2023
Samyang 135 optical aberrations Samyang 135 f/2 Coma Tilt Giulio Ercolani Last post: Jan Erik Vallestad	12	352	Mar 24, 2023
What causes these aberrations? Stellarvue SVX102T Stellarvue SFFR.74 Acquisition +2 Maciej Karcz Last post: Georg N. Nyman	6	449	Feb 20, 2023
Problem with coma corrector Baader MPCC Mark III and GSO Newton 200/800 F4 Reflectors Coma Fernando Last post: Dariusz Kucharzewski	30	1.9k	Feb 17, 2023
Help on getting round stars with F5 GSO Newt Fast Newtonians Reflectors Coma Coolhandjo Last post: Dale Penkala	42	456	Jan 24, 2023
Help with optimizing imaging train ZWO ASI2600MC Pro Sky-Watcher Explorer 130PDS Acquisition +2 Morsing Last post: Paul Wilson	10	512	Jan 22, 2023
Need reviews of the Sky-Watcher Quattro 150P with f3.45!!! Sky-Watcher Explorer 150P Equipment Reflectors +1 Thorsten Malchow Last post: Thorsten Malchow	4	468	Jan 18, 2023
ZWO OAG+guide camera and Baader coma corrector ZWO OAG-L Guiding Coma Stefano PesciIOTD Staff Last post: Brian Fulda	5	373	Jan 8, 2023
Insanely bad coma with Tamron LD A014 18-200mm f/3.5-6.3 Di-II Lens Equipment Coma Troubleshooting Acuate187 Last post: John Hayes	3	337	Dec 31, 2022
What's up with my Canon 200 mm f2.8 USM Canon EF 200mm f/2.8L USM ZWO ASI2600MC Pro Troubleshooting +1 John Noble Last post: Luka Poropat	23	1k	Dec 6, 2022
Some problem with flattener Equipment Flattener Troubleshooting +1 Michele Campini Last post: Michele Campini	5	362	Dec 4, 2022
Find the good backfocus with my 200/800 SkyWatcher ZWO ASI1600MM COOL Equipment Reflectors +1 Valentin JUNGBLUTH Last post: ManuManu	5	414	Nov 24, 2022
Yet another backfocus question Equipment Auto-Focusing Coma gfunkernator Last post: Björn Arnold	2	185	Sep 2, 2022

Showing 1-50 of 80