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The Blue Snowball Planetary Nebula - NGC 7662 by M.J. Post

Understanding optical principles, telescope design, and light behavior.

Showing 1-43 of 43

	Replies	Views	Created
How do I choose a camera sensor/barlow combination that will approximate the view given by a particular eyepiece? Equipment CCD Prime Focus +4 Rick Evans Last post: John Nedelcu	10	110	11 days ago
OOUK ODK10 mirror spacing & corrector placement Orion Optics UK ODK10 Optics Collimation Tobiasz Last post: andrea tasselli	3	59	18 days ago
Celestron C8 Equipment Flattener Reflectors +2 Rainer EhlertFrequent contributor Last post: andrea tasselli	1	50	Dec 1, 2025
Current China tariff status as of November 2025 CMOS Equipment Filter Wheel +2 Tommy Mastro Last post: Bill McLaughlin	21	588	Nov 26, 2025
Halo artifact troubleshooting on Esprit ED80 and lens cleaning safety Equipment Refractors Optics +4 lucasjacobson Last post: lucasjacobson	5	65	Nov 26, 2025
Starspikes reduction Equipment Reflectors Optics +1 Lalo Juarez Last post: Alex Nicholas	2	53	Oct 11, 2025
Are these halos caused by good seeing and diffraction patterns? Planewave CDK14 Seeing Conditions Optics +2 Anthony Grillo Last post: John Hayes	11	391	Sep 29, 2025
Secondary and spider vein reflections appearing in my telescope images Ritchey-Chrétien Calibration Optics +2 Christopher Gomez Last post: andrea tasselli	3	98	Sep 15, 2025
Hairy Stars Equipment Reflectors Optics +3 Tony GondolaFrequent contributor Last post: Tony Gondola	27	451	Sep 7, 2025
Another weird cdk star halo issue! Reflectors Optics Help Needed +1 Anthony Grillo Last post: Anthony Grillo	15	227	Sep 5, 2025
What's this? Processing Optics Deep Sky +2 Tony GondolaFrequent contributor Last post: andrea tasselli	18	507	Jul 31, 2025
A Comparison - Fast vs. Large FLI PL16803 Equipment Optics +2 andrea tasselliFrequent contributor Last post: andrea tasselli	19	1.4k	Jul 27, 2025
Airy Disk size vs. Spot Diagram optical performance: What's the catch? Takahashi TOA-130 Celestron RASA 11"Acquisition +2 John Stone Last post: John Hayes	6	174	Jul 5, 2025
How I originally got interested in optics Optics John Hayes Last post: Chris White- Overcast Observatory	15	605	Jun 23, 2025
Image inversion in the optical train ZWO ASI6200MM Pro Equipment Optics DavesView Last post: Tony Gondola	10	174	Jun 13, 2025
Astronomical Imaging Simulator Equipment Optics How-to Paolo Sirtoli Last post: Paolo Sirtoli	4	171	Mar 25, 2025
Standard SCT back focus Reflectors Acquisition Optics +1 Tony GondolaFrequent contributor Last post: Himanshu Pandey	5	111	Mar 3, 2025
Fast Scope vs Large Aperture Acquisition Optics Deep Sky Clayton Ostler Last post: Giovanni Paglioli	125	5.2k	Feb 20, 2025
Aperture obstructions and light transmission. Reflectors Acquisition Optics +1 ScottF Last post: Tony Gondola	10	157	Jan 31, 2025
Determining best backfocus distance through star testing Equipment Refractors Optics Eyecon Last post: James Peirce	13	410	Oct 7, 2024
What is your F/ratio Reflectors Acquisition Optics +1 Tony GondolaFrequent contributor Last post: Tony Gondola	44	1.2k	Aug 3, 2024
Astro Imaging Channel Tonight (7/7/24): The Quest for Aperture: Why are big telescopes better? Optics John Hayes Last post: John Hayes	32	2.1k	Jul 7, 2024
Large telescopes and seeing - what does make sense? Equipment Seeing Conditions Optics Christian Großmann Last post: Georg N. Nyman	7	467	Feb 4, 2024
BEAMSCOPE, a converging Fresnel lens to observe celestial "schlieren-optics" Seeing Conditions Optics Off-topic Danny Caes	0	141	Jan 7, 2024
Was Isaac Newton's spectral color "Violet" a misinterpretation of the first supernumerary arc at the concave inner fringe of the Primary Rainbow? Optics Off-topic Danny Caes Last post: Danny Caes	5	366	Jan 5, 2024
The light of Sirius (Alpha Canis Majoris) projected by a solar furnace's hundreds of mirrors on a white sheet of paper Optics Off-topic Danny Caes Last post: John Hayes	3	440	Jan 5, 2024
Enhanced R.G.B.-colored optical phenomena in the light of a very bright supernova (an "infinite" looking pointlike lightsource) Optics Physics Off-topic Danny Caes	0	65	Jan 4, 2024
Has anyone used a telecentric lens for astrophotography? Optics Off-topic Ryaja Last post: andrea tasselli	1	185	Nov 17, 2023
Please help: comparing two fl, f ratios, pixel scale, etc Reducer Acquisition Optics +1 Sean Last post: Sean Mc	2	176	Oct 15, 2023
Sampling rate for Color camera Planetary Camera Optics Request for feedback +1 Gianluca Last post: andrea tasselli	1	142	Oct 6, 2023
What is the lower bound for converting a classical Cassegrain to a faster f-ratio? Equipment Reflectors Optics Doug Summers Last post: Doug Summers	7	449	Aug 9, 2023
Pixel scale Q Acquisition Optics Deep Sky Sean Mc Last post: AdrianC.	11	534	Aug 2, 2023
Struggles and Progress Towards a VIS/NIR Rig for Photometry. Gear: Baader Flip Mirror Cell, Dichroic mirrors/filters, etc. Equipment Reflectors Optics Alan Brunelle Last post: Alan Brunelle	9	495	Oct 10, 2022
What is the focal length of my ESPRIT 100ED? Canon EOS 6D Equipment Refractors +1 Frédéric Auchère Last post: Luc Viatour	16	732	Aug 30, 2022
Confusion about image circles (tak fsq106 vs. others) Equipment Refractors Optics Michael E. Last post: Rouz Astro	6	339	Apr 11, 2022
"55mm" standard distance and sensor-surface distance tolerance Equipment Filters Optics Georg N. Nyman Last post: kuechlew	11	716	Apr 8, 2022
Is there a way to calculate the needed exposure time at a given f-ratio at which more data will not lead to a better picture anymore? Acquisition Optics Deep Sky Anderl Last post: Daniel Arenas	10	1.4k	Mar 23, 2022
James Webb images Equipment Optics Patrick Stevenson Last post: kuechlew	14	1k	Mar 14, 2022
Question about optics : Barlow and extension tubes Barlow Acquisition Optics +2 Jérémie Last post: Jérémie	4	97	Jan 30, 2021
FWHM--Try #2 Processing Optics Off-topic Rodd Dryfoos Last post: Sigga	16	178	Jan 25, 2021
FWHM Processing Optics Off-topic Rodd Dryfoos Last post: Doug Summers	17	413	Jan 25, 2021
Decreasing Telescope aperture Equipment Optics Ali AlhawasIOTD Staff Last post: Lomingen	6	200	Jun 14, 2019
AO Experiences Adaptive Optics Equipment Optics Deep Sky West (Lloyd) Last post: Kevin Morefield	8	254	Oct 1, 2016

Showing 1-43 of 43