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NGC 891 by Dominique DANIEL

Telescopes using mirrors as the primary optical element.

Showing 1-50 of 223

	Replies	Views	Created
Hairy Stars Equipment Reflectors Optics +3 Tony GondolaFrequent contributor Last post: Tony Gondola	27	444	25 days ago
Another weird cdk star halo issue! Reflectors Optics Help Needed +1 Anthony Grillo Last post: Anthony Grillo	15	222	28 days ago
OCAL 3.0 pro max VS OCAL 4.0 Reflectors Buying Advice Collimation +1 Gabriel Last post: Deepan Vishal	6	208	Aug 29, 2025
Diffraction Pattern Question Reflectors Advanced Collimation +3 Josh Jones Last post: andrea tasselli	7	210	Aug 27, 2025
Is something wrong with my reflector? Omegon ProNewton N 153/900 Reflectors Help Needed Slavic Dragovtev Last post: andrea tasselli	11	463	Aug 19, 2025
Optimized Newtonian - Is it worth it? Equipment Reflectors Help Needed +1 Tony GondolaFrequent contributor Last post: Read noise Astrophotography	20	801	Jul 28, 2025
Replacement focuser Equipment Focuser Reflectors Tony GondolaFrequent contributor Last post: Tony Gondola	10	247	Jul 17, 2025
Setup with 8 or 10 inch Newton? Avalon Instruments M-uno Harmonic Mount Reflectors Tobiasz Last post: Aris Pope	12	499	Jul 12, 2025
New Newtonian Telescope From China Equipment Reflectors Review Stephen Shen Last post: MaksPower	29	2k	Jul 7, 2025
Which newton scope for observatory Equipment Reflectors Buying Advice Vandewattyne Last post: Mau_Bard	21	531	Jul 4, 2025
Extender for Skywatcher 250p Sky-Watcher Quattro 250P / 10-S Equipment Reflectors Lalo Juarez Last post: Michael von Berner-Purgstall	7	197	Jun 29, 2025
3" Focuser Support for Orion 8" Reflector Equipment Focuser Reflectors texasastrophotography Last post: Stephen Jones	14	241	Jun 3, 2025
Contemplating a Carbonstar 150 Apertura CarbonStar 150 Imaging Newtonian ZWO ASI533MC Pro Reflectors +2 Phil Creed Last post: ScottF	19	830	May 20, 2025
Polvere e sporco sullo Specchio primario! Skywatcher Newton 10" 250/1000 mm, Sky-Watcher Quattro 250P / 10-S Reflectors Cleaning Luigi Ferrari Last post: andrea tasselli	4	106	May 15, 2025
Light Leaks Reflectors Acquisition Light Pollution +1 andrea tasselliFrequent contributor	0	157	May 10, 2025
My move from refractors to newtonians Equipment Refractors Reflectors Philippe Barraud Last post: Antonio Parisi	7	553	Apr 27, 2025
Moving a crated CDK14 Planewave CDK14 Equipment Reflectors jego Last post: Kevin Morefield	7	206	Apr 22, 2025
Schmidt Cassegrain Telescope Imaging Southern Maine Astronomers Reflectors Brett Joslin Last post: Dean Ostergaard	14	86	Apr 12, 2025
How easy would this app be to develop? Reflectors Collimation Coma CraigT82 Last post: Tony Gondola	6	281	Apr 3, 2025
Dealing with Dew - Takahashi Epsilon Takahashi Epsilon-180ED Dew Heater Reflectors Deepan Vishal Last post: daywalker	15	328	Mar 24, 2025
M40 Messier Objects Reflectors LRGB Harald Becher Last post: Gaillard Jérôme	1	101	Mar 11, 2025
TS GPU Ghosts/Reflections? TS-Optics NEWTON Coma Corrector 1.0x (TSGPU)Canon EOS 700D / Rebel T5i / Kiss X7i Sky-Watcher Explorer 150PDS +2 John Walsh Last post: John Walsh	9	240	Mar 8, 2025
Standard SCT back focus Reflectors Acquisition Optics +1 Tony GondolaFrequent contributor Last post: Himanshu Pandey	5	109	Mar 3, 2025
Operazione di "defork" del Meade 2080 8" Meade Model 2080 8" f/10 SCT Equatorial Mount Reflectors Biagio De Simone Last post: Biagio De Simone	5	107	Mar 2, 2025
In Search of Full-Frame capable Coma Corrector for Newtonians Equipment Reflectors DIY Charles HagenIOTD Staff Last post: andrea tasselli	2	133	Feb 23, 2025
Upgrading a 20 year old 8" F/2.6 astrograph Reflectors DIY Off-topic Dave Erickson	0	327	Feb 14, 2025
Tips for Sky-Watcher Starlux 190MN / BK 190MN DS Sky-Watcher Starlux 190MN / BK 190MN DS Reflectors Collimation pessorrusso Last post: Craig Dixon	12	528	Feb 13, 2025
Aperture obstructions and light transmission. Reflectors Acquisition Optics +1 ScottF Last post: Tony Gondola	10	155	Jan 31, 2025
Bobs Knobs for my Quattro 250P Sky-Watcher Quattro 250P / 10-S Equipment Reflectors +1 Eric Jeziorczak Last post: Joel Lee	3	80	Jan 29, 2025
CDK14 vs. CDK17 Planewave CDK17 Planewave CDK14 Reflectors +1 Still_Cloudy Last post: Dark Matters Astrophotography	33	1.8k	Jan 27, 2025
Is it worth upgrading to a SW quattro 150? Sky-Watcher Quattro 150P Reflectors Buying Advice Menelaos Last post: Tony Gondola	4	404	Jan 27, 2025
TS/GSO PHOTON Focuser TS-Optics PHOTON 150mm/6" f/4 Newtonian QHYCCD QHY268 M Refractors +2 NAG Last post: Tony Gondola	2	144	Jan 7, 2025
Forgetting to put marks when cleaning the main mirror Reflectors Cleaning Morian Last post: Morian	3	176	Dec 18, 2024
Weird star halos on new cdk14. Planewave CDK14 Reflectors Artifacts Anthony Grillo Last post: Anthony Grillo	48	1.4k	Dec 18, 2024
Heavy duty mount for a 40-50kg payload and other upgrades on the scope. Equipment Reflectors Dobsonian Luka Poropat Last post: Alex Nicholas	9	384	Nov 23, 2024
POLL: Would you rather shoot with a Quattro 8 inch f4 with 585mc pro or Edge 8 hd at f 10 with 2600mm pro at bin 2? Equipment Reflectors Buying Advice SolarVortex3562 Last post: SolarVortex3562	12	664	Nov 18, 2024
Collimation Issue Equipment Reflectors Collimation Ajith Everester Last post: Tony Gondola	1	77	Nov 15, 2024
HOTECH CT Collimator and Edge Hd 8 Equipment Reflectors Collimation James Last post: Dave Rust	2	166	Nov 11, 2024
Cleaning primary mirror Sharpstar SCA260 Reflectors Cleaning Tomas Kocanda Last post: surfinash	7	261	Oct 31, 2024
12" Truss Newtonian f/4 or 14" Truss RC f/5.3 for astrophotography Equipment Reflectors Observatory Radu Marinescu Last post: David Russell	13	718	Oct 21, 2024
qhy 294m and 10 f/4 newton QHYCCD QHY294M Pro Equipment Reflectors Jan_F Last post: Jan_F	5	70	Oct 10, 2024
Refurbished scope, not quite as sharp as it could be. Equipment Reflectors Troubleshooting Jens Last post: Matthew Paul	8	503	Oct 7, 2024
CEM70 with 12 inch newtonian iOptron CEM70 iOptron CEM70-NUC Equatorial Mount +1 Ori Shabtay Last post: Ori Shabtay	9	237	Sep 20, 2024
Reflections caused by EdgeHD or by the filters - do you have the same issues? Celestron EdgeHD 8"Reflectors Artifacts Christian Großmann	0	158	Sep 14, 2024
AG Optical support group? AG Optical FA12 12.5 inch F5 Reflectors Cleaning Ashraf AbuSara Last post: Patrick	16	256	Sep 2, 2024
RCOS control options? RCOS 10" f/6 Reflectors Troubleshooting drmikevt	0	33	Aug 31, 2024
Thinking of adding the Apertura CarbonStar 150 w/0.95x Comma Corrector to my collection Apertura CarbonStar 150 Imaging Newtonian Refractors Reflectors +1 peng155 Last post: Phil Bivins	15	831	Aug 27, 2024
To C11 or not to C11 Celestron C11 Equatorial Mount Reflectors Mike H - Sky View Observatory Last post: Mike H - Sky View Observatory	19	711	Aug 4, 2024
What is your F/ratio Reflectors Acquisition Optics +1 Tony GondolaFrequent contributor Last post: Tony Gondola	44	1.2k	Aug 3, 2024
Glare/diffraction aberrations from off axis/out of field very bright stars Fast Newtonians Sky-Watcher Quattro 250P / 10-S ZWO ASI2600MC Pro Reflectors +1 Anthony Quintile Last post: Anthony Quintile	11	165	Jul 29, 2024

Showing 1-50 of 223