Astro-physics, Canon, Pentax, QSI, Rob Miller, Stellarvue, Takahashi, TEC, William Optics (Time to thin the herd) My astrophotos at http://www.flickr.com/photos/r...s/72157627136712042/
Photo: Qhy9 mono + qhy 5x2" filter wheel and Baader 2" LRGB, Ha, O3 and S2 filters , Meade DSI Pro 2 as guider, TS 9mm off-axis guider Binoculars: Nikon Action 12x50 Telescopes: Skywatcher Evostar 120ED f7.5 APO + TS 2" flattener Mounts: HEQ5 Pro Eyepieces: Nagler 11mm type6, Pentax XW 7mm, Televue 2X barlow 1.25"
C14 EdgeHD, C11 EdgeHD Zhumell 8" f/6 Newt AP1200GTO, CGEM DX, CG5-ASGT Rob Miller Tri36M tripod Canon Rebel XS, Atik 314L+, DSI pro I,II, QHY5L-II SX 7 FW with Astrodon LRGB, Ha 5nm Hutech OAG5, Rainbow Optics Grating Scorpio Observatory
Mike my flickr page: http://www.flickr.com/photos/54961839@N06/ my astrobin page: http://astrobin.com/users/mcarroll/?public&sub=acquired SBIG ST8300M, FW8, Astrodon LRGB/Ha/OIII/SII filters Canon EOS XS 1000D (modified) TPO 8" RC Astro Tech 6" RC Orion 80ED Orion SSAG with 50mm guide scope Orion Altas EQ-G mount
Best to you, Warren
Warren A. Keller
Quote:I read a very long thread the other day on here and I wanted to see if I could make some type of headway on the subject.
Quote:I have experimented with exposures and I had the data from some experimentation with exposures and just wanted to give some raw data on the current subject that has been hot on the forum. I have learned that longer seemed to be better.
Quote:Well both examples are really good but the longer exposures really show more detail. You should have really dark skies to be able to make such long exposures. I can rarely go over 5 minutes without the background to become too bright.
"Don't sweat the petty things and don't pet the sweaty things" - George Carlin deanrowe.net/astro Whats with that avatar?
Quote:John has a great set of rules for life
Quote:I read a very long thread the other day on here and I wanted to see if I could make some type of headway on the subject. I had some great skies again last night and I re-shot the Xmas tree area. I had previously shot it at 93X300sec. I shot it last night with 20min exposures. 9X1200sec. I tried to process them as good as I could. Here are the results....9X1200sec -40C 20min exposures 93X300sec 300sec exposuresI hope this might help a bit. I sure enjoy being able to shoot the 20min exposures on certain stuff.Jimmy
14.5" Starmaster with ServoCat and Argo Navis 1966 Unitron 4" Model 152 EQ Tec 140 TV NP101 f/5.4 APO Telvue .8 Focal Reducer FLI ML8300 and CFW-2-7 filter wheel Astrodon Gen2 RGBL 2" filters Baader 2" Narrow Band Filters Borg 50mm Guide Scope/ATIK Titan Guide Camera AstroPhysics AP900 Losmandy GM-8 Gemini
Check it out! I can form a full sentence! Scopes: Explore Scientific 152mm f/8 Carbon Fiber Triplet, Obsession 15" Classic Camera: SBIG ST-8300M, SBIG FW8 Filter Wheel, Astrodon LRGB and 3nm Narrowband Filters Mount: AP900 Hang out with us at Mount Lemmon Sky Center
Paramount MX AG Optical 12.5 IDK Apogee Alta 16803 AstroDon Series 2 E LRGB AstroDon Ha 5nm SII 5nm OIII 3nm SBig Sti ACP observatory control, ACP Scheduler PixInsight, Maxim DL 5, My Images http://www.remarkableheavens.com/
Quote:All I know is that the 9X20min was considerably easier to process than the 93X5min picture. I'll stick with 20min on objects like this.
http://www.astrobin.com/users/orion69/ TS 150 mm APO Triplet, Feather Touch 3.5" focuser, Micro Touch Focusing System CGEM on custom made platform Atik 383L+ mono, Atik filter wheel, Baader LRGBC + narrowband filters SX Lodestar + TSOAG9 Dew-Not heater
Quote:Frank (and others of course), I have question that has been already addressed in this and other posts but to make things more clear (at least for me): suppose I shoot somewhat dim object and I'm using NB filters. After 10x30 min subs I've got my new stacked picture. Now I'm shooting same object, with same gear, same sky quality (completely same conditions as before) only now I'm shooting 5 min subs x times. Question: is there some detail on first image that would not be visible on second image no matter how many 5 min subs I take?
Your shorter subs will show far less detail resolution and contrast no matter how many you take. That is the point of Jimmy's experiment.
Quote:Orion is shot in HDR style. I did exposures for the core to bring that out. That is a no brainer that we all know. 10min exposures worked perfect for Me on that area of sky.
Quote:It would be useful if I can get same detail with more shorter subs but I see that there are different opinions in that question...
Quote:The models seem to assume that photons arrive instantaneously, in large quantities.