Adam AP Mach 1, Rob Miller TRI36L, Celestron 8" Edge HD Hyperion 17mm, Celestron 40mm Plossl, TMB 7mm & 9mm WO 66, Lunt LS60/B1200 PT, CG-5 Clone STF-8300m Pro Package, Honis-Modified Canon XS, Un-modded T1i, SSAG, TSOAG9, SX Lodestar
Lackawanna Astronomical Society
Equipment: 8-inch Meade LX5/2080
10-inch Meade 2120/LX-6 f6.3 Premiere Edition.
10-inch Meade LX200 Classic
Registax 6 Deep Sky Stacker Adobe Photoshop CS3 Extended Nikon Capture Photomatix Pro 3.2 http://www.flickr.com/photos/rosenow_photography
ROR Observatory Levenhuk 8" carbon fiber RC, Astro Physics CCDT67 Astro-Tech AT8IN w/Moonlite, Baader Mark III MPCC Levenhuk 80mm triplet, Astro Tech 0.8X reducer/flattener Celestron CGEM DX w/HyperTune STF-8300M SX 7 position 36mm CFW Astrodon 5nm H-alpha Little Piney Observatory
Quote:Hey everyone. I'm new here and just starting to get into astrophotography. I'm looking into getting a nice, used dslr from amazon or similar stores. Price shouldn't matter since i'm intending to buy used. From what I've read so far, CCD sensors seem to be the way to go for deep sky photography, which is my intention. When i search for the best dslr's everyone seems to have a different opinion and most cameras coming up were CMOS. So I decided to go to the pros and experienced astronomers here on CN in hopes some of you can give me tips and info on the best type of camera for deep sky imaging. Thanks in advanced guys!
Quote:i have up to a couple grand max at the moment. wasn't looking to spend it all right now. was hoping a used camera wouldn't go for more than 2 or $300. Although the mount you bring up is great advice! i think i should defiantly invest in a new one as well. I have a celestron SCT 8SE with the stock mount. Would this mount for sure need to be replaced? or is it good enough to get by for starting off astrophotography?
Quote:ISO 12,800 and actually usable up to ISO 25,600
Quote:Quote:ISO 12,800 and actually usable up to ISO 25,600 Which is pointless for AP if this is over the unity gain of the camera - quoting the ISO nearest unity gain (1 photon => 1 ADU) would be useful
Quote:It isn't pointless if you are unable to guide and the camera can do in-camera stacking to remove the excess noise.I am not saying that shooting at these ISOs is ideal for all situations. However, for the case of an ALT AZ mount like the OP has you would need as fast a scope as possible and the ability to shoot an extremely high ISO.
Quote:It isn't pointless if you are unable to guide and the camera can do in-camera stacking to remove the excess noise.
Quote:ability to shoot an extremely high ISO.
Quote:Quote:It isn't pointless if you are unable to guide and the camera can do in-camera stacking to remove the excess noise.
I don't think you understand that once the ISO amplifier is converting the signal due to 1 photon to 1 digital unit then there are absolutely no gains to be made AT ALL going beyond this. All you are doing after this is wasting dynamic range within the digital storage and filling the gaps with random noise.
Now in-camera stacking at unity gain and below IS a benefit and I'd buy into that. Sure that camera may be good - but its not because of the super high ISO
Quote:Tonk is right about this. After unity gain, there is zero benefit in raising iso. In fact, if you are calibrating in post processing, it is introducing more noise and lessening dynamic range. You would be much better off shooting at unity gain, and selectively amplifying a post calibrated image in photoshop.
But, I can think of one place that high iso may be handy. If you have no intention of post processing, stacking or calibrating then you may choose to use it. Or if you are using a DSLR for video astronomy, it may be effective.
Otherwise, you are best imaging at unity gain for your camera, then doing your calibration, then doing your post processing.
Quote:You are missing the point. Nobody is suggesting lengthening the exposure and lowering the iso. Just lowering the iso. You can do all of the amplification in post processing. The key is to begin with the purest signal. This is what unity gain provides.
Quote:I never said that what it does is not a lossy process. However, it is the only camera that can do it in-camera so that makes it very useful for people that have mount limitations.
Quote:Or am I misunderstanding and by "stacking" do you actually mean in-camera noise reduction with an automatically taken dark????