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My 350d has a claimed " sweet spot " of 800 however a little bit of recent research and actually looking at the noise vs signal graph shows that the noise and signal increase equally from 400 to 800. Obviously the gain with 400 is better dynamic range. From experience with playing with shorter subs is that the more feint stuff will come out, it just requires a lot more intergration time. If the result is a cleaner, more colorful image, then I think that's the way to go. I used to be restricted to 22 sec subs on my alt az mount so taking 100s of subs is not unusual to me and I achieved a lot given what I was dealing with. It's just now it's going to be 100s of minutes subs. If that's what it takes to get great images, that's what I'll do.
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