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leinad,
I sue ISO800 and with an interval of 8 seconds between images. Unfortunate what I think you are looking for is someones experiences with an uncooled 40D or similar camera. My camera has been modified by Central DS with a peltier cooling unit. The chip is usually around 19 degrees below ambient and as such has little if any noise. I cannot really help you with an uncooled unit on such long subs. Although one of the other chaps that was there last night was using such a camera and doing 30 minute subs. He had prepared his darks the night before and just applied them when processing. So you can take long subs with an unmodded camera, but lots of darks are necessary to remove the noise.
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