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Good thread. I was meaning to post the same question myself to see what others do.
I use CCDstack and you definitely cannot stack 100 images at once. You get memory errors. So I try to stack as many as CCDstack will allow which for Trius 694 11mb files is about 20 or 30 but for 16803 files its more like 15 perhaps 20.
This may be another reason to use PI then if it can stack 100 images.
CCDstack has improved with its memory issues but its still very memory intensive.
I agree with Rick the data rejection algorithims must work better with larger samples as they are statistical maths techniques which all have the common denominator of trying to isolate the odd pixel out and reject it. Also median combine is going to work better as well.
Just how many subs before the larger stack improvement weakens to a neglible point I don't know. At a guess I imagine its around 10 to 15 subs. I'll have to ask Stan Moore about that. I doubt that needing 30 or 50 or even 100 making a difference is correct but I don't know for sure.
Greg.
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