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Worth experimenting with ISO.. makes less difference than many people think and you definitely gain dynamic range when you need it.. I tell people this all the time on my workshops but it's only when I was standing there figuring out how to make the shot work that I decided to do it. 400 on 5DII also achieves almost identical to 3200, but maybe not quite as good as same settings on 6D.
I did some experimenting on this point last night with D800E. The results I got I PMed you. I was surprised. I think in some cases there would be a gain using a lower ISO and boosting in post processing. It may be a good strategy in light polluted areas and probably not as needed from a dark sky site is my initial conclusion but I intend to check it out more next time I am at my dark site.
In a way when you are imaging at ISO400 and boosting in post processing it would depend on how loseless of DR your post processing boost is as well. Plus the assumption is your processing will be better than the camera engineers implementation of high ISO boost incamera.
Perhaps that is true that camera engineers are limited by amplification in a way post processing is not. That would be a question for a camera engineer. Hmm , I know one so I think I will ask!
Greg.
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