iso1600 subs and lots of 'em.
I like to push for as much as I can get from the DSLR.
iso1600 seems to work pretty well on the 40D in my location - temperatures usually drop sharply at night in my neck of the woods so that's significant too.
1600 in summer is a P.I.T.A!!
No hard and fast as the replies indicate - experiment!
Doug
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