Thanks for the link Trev, rather technical but interesting...
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Yeah read that article Jase in the Aust S&T , I usually do a hour of data if I can, I should do more... 3 hours is quiet some data set and I hear that the 20da has much less noise than my 300d. maybe I need 4 hours!!
But would be interesting to see if 40 frames at iso 1600 or 20 frames at 800 iso would give in ways of noise comparision vers ambient temp. I know that the colder weather makes a real difference but more interested for the warmer summer season? I usually image the Ds stuff so noise in the image is always a problem when you push the processing..I use neatimage but I rather not use it if possible..
Cheers Gary