Quote:
Originally Posted by mynameiscd
My question, is 10x3 minute the same data as 30x1 minutes?
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A question that gets asked quite often. Unfortunately, the answer is a little complicated. If you capture enough data in every pixel so that the shot noise from the signal overwhelms the read noise of the camera in a 1 minute sub then 30x1 mins is going to give you a result that's as good as 10x3 mins.
Whether a 1 minute sub is sky limited will depend on your aperture, focal length, the amount of central obstruction (if there is a secondary mirror), the amount of vignetting, the sky brightness, and the QE and read noise of the camera. It's possible to do some measurements and figure out how long your subs need to be but you need some basic maths chops and you need to do some work to measure your camera parameters.
Here's a link that explains some of this:
http://www.iceinspace.com.au/forum/s...d.php?t=117010
Cheers,
Rick.