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I'm impressed. I assumed when I looked at it you are using a KAF8300 chipped camera. That little Sony A7s looks fabulous. 20 x 2 minutes and that much detail is terrific performance.
ISO3200 may be a little conservative with that camera which I often read is quite good up to ISO52800.
Very nice and very promising. Slam it up, its got the performance there.
I suppose the cutoff is where the stars lose colour. You need some trial and error to find where that point is. It also has deep wells, even deeper than a KAI11002 chip so it could be pretty high.
Greg.,
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