|
I've a 450D and still experimenting. Have had some success with 1600 as long as I take quite a few subs and cancel out much of the increased noise. 800 ISO seems the best compromise. Trouble is you double the exposure time and hence increase the dark current and dark noise. But sometimes you need a 10 min exposure at 1600 just to record faint objects. If you use ISO 800, you need a 20 min exposure. I think 10 mins is about the limit for a DSLR unless its cooled.
|