Astrophoto: Intes Micro ALTER-M606 (6" f/6 MCT), Astrotech AT6RC (6" f/9 RC), 2x Tair-3 lenses (300mm f/4.5)
Visual: Celestron 8 SCT ('77 Orange Tube, 8" f/10), Selsi #247 Refractor (aka Towa #339, 80mm f/15), Tasco 11TE-5 Newtonian (4.5" f/7.9), Galileoscope (50mm f/10)
Mounts: Celestron CI-700, iOptron ZEQ25GT, Celestron CG5-ASGT, plus a couple old EQ2s
My Astrophotography Site: http://ap.x-wing.ca/
Thanks, Mitch... "fmhill"
"My GOD, It's Full of Stars!" For the Obser: Atlas EQ-G w/moded SN8,JMI moto-focus, flocked tube,custom mirror cell.ED80 w/ACCUFocus,SSAG,DSI,EZ Guider. Modded Canon T1i,Pentax K-5II. For the field:14" Orion 14xxi,Flocked Tubes,Custom Paint,6 Fan Cooling,LED ground board lighting. Celestron CG5GT for film/digital photos w/EZ Guider, Atlas EQ-G w/an ES102ED/AT72 Piggy backed,EZ Guider. Various 1.25 & 2" Eyepieces.
Quote:What ISO to use with T3i
Quote:I can crank up the gain higher than the 400 I was using. At 400 my histograms and images seemed weak.
"...life is but a dream." Trying to update my tutorials Be sure to add me on Google Plus (TONS of good Science and Astro people here!) Mike's homepage My Scope, Akule - the Custom 14" f/4.5 Newt
Quote:If I am reading the unity gain charts right, my 7D would gain should be at ISO 1000 ??
Televue 85/TRF-2008 field flattener, Meade LX200 10", Manfrotto 055SSB tripod/410 geared head/AstroTrac TT320X-AG/056 3D head, GM-8/Gemini, 10 Micron 1000 HPS, Canon 40D (unmodded), Canon 450D (modded w/Astronomiks clip-ins - UV/IR, OWB), Coronado SM60/Lunt B1200/WO diagonal, Baader Herschel Wedge Leeds Sky Clock Ripon Sky Clock
Quote:This is fun!http://www.dpreview.com/reviews/studio-compare#baseDir=%2Freviews_data&ca...
SCOPES: CPC1100; AT66ED; EdgeHD 8";SVR90T RAPTOR
MOUNTS: CGEM; Vixen GP2; iOptron Sky Tracker; Celestron AVX
CAMERAS: Canon 60D;Lodestar
EYEPIECES:TV N31T5;Delos14;Delos8;Pan27; PL20;PL25;PL32;TMB9
The Lord sits enthroned above the circle of the earth...He stretched out the heavens like a canopy.
Celestron 925 EdgeHD Hyperstar
Canon T1i modified by Brent Oliver
Bored? Peruse my website: http://www.samirkharusi.net/
Quote:We can assure ourselves of high stacking efficiency (Skyfog Statistics Limited Regime) by using subs that are long enough to place the Skyfog Mountain at well over 30x the Read Noise. Let us say we aim for the Skyfog peak to be at 100x the Read Noise.
Celestron C-8 SCT
Gary Honis modified Canon 450D (Baeder Mod)
MonoMods monochrome Canon 450D (Debayered, Baader filter, LPF1 removed)
ONAG On-Axis Guider
Starlight Xpress Lodestar Autoguider
Canon EF 200mm f/2.8L II USM
Olympus Zuiko 50mm f/1.8
Quote:But another reason to not run your exposures longer than productive is that something could go wrong--satellite trail, field rotation, gust of wind.....whatever. If something ugly happens in the last minute of an twenty minute sub exposure, you have wasted lots of time. If something goes wrong in the last minute of a series of exposures lasting 20 minutes, you have wasted only the time of one sub.