I don't use the %, generally.. I just drag the slider back to where I feel the frames are starting to deteriorate. In this case (reprocess), I was more aggressive, because I knew I would only stack 100, I dragged the slider back to 300 (out of 450 original frames).
And yeh, 5fps @ 1/25s exposure. Good thought about dropping exposure to up the gain. It used to be "as low a gain as possible" - but it seems that's not the case anymore.
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