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G'day Dunk,
I use a 1000D, which is very similar to your 1100D, and have found ISO800 to give the best results regarding noise.
Normally I take 300sec subs and give it 10secs between shots, I guess the longer cool down the better. I just chose 10secs because I read it somewhere but haven't experimented for myself. Doubling it to 20secs only lengthens the imaging session by 10mins so I should try it.
M16 looks promising - I must have a go at it when the wind dies down a bit.
Kev
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