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RAW mode is prefered as once you have a dozen or so images, you combine them with dark, flat and bias images in software to reduce the noise, and basically this is like doing maths on a large spreadsheet file except the numbers in each box are huge with lots of decimal points. RAW files from my 450D are 14bit files making the numbers possibly enormous.
My scope is out back now imaging M83 again, this time with my new light pollution filter. Just done 4 x 10minutes @ 800 iso but I can see from the images that my mount and guiding isn't up to 10 minute exposures so it's now running at 5 minutes @ iso 800. After I get a stack of those I'll try 5 minutes @ iso 1600 and see what they look like.
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