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5 minute subs means lots of shots, 5 minutes each. The longer the exposure the more detail you'll capture. The more subs you get the cleaner the image. The FAQ for deepskystacker explains the maths better.
The higher the iso you use the more noise you will need to deal with in the result. When I was using a 40D I stuck with 400iso and extended exposure if I wanted more detail. I think exposures over 15minutes proved problomatic by way of guiding and noise. I found that at 400iso, with exposures of 10minutes each, the images I got from the 40D where easier to manage, noise wise. Trial and error really.
Last edited by Tandum; 11-11-2009 at 01:55 AM.
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