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I agree a fair bit of experimentation is required but the tables Paul mentioned were the sort of ball park figure I was looking for to base this experimentation on.
As for shooting using ISO800 and above, until today I would have disagreed, unless you were using a Canon 5D camera.
A lot of the 350D and 20D photos I've seen are slightly marred by excessive noise (in my opinion). I certainly mean no disrespect to the photographers of these otherwise excellent images, I only hope I will be able to do half as well.
I thought using a lower ISO and longer exposure would be the go. That was until I saw Octane's wide field view of Scorpius today.
Maybe it's because most of the noise I've is in the red channel and Octane was using an unmodified camera?
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