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I find with my Canon 400D ISO1600 and 200 seconds is the optimal.
The 350D and 400D are very similar I think.
I use to think that perhaps longer exposures in lower ISO would provide benefits, but if you Google for graphs of noise/ISO/temperature for your camera you will find I think that ISO 1600 will be optimal for your camera - shorter exposures at higher temperatures and longer when it's colder.
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