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So you like to let aperture auto adjust, ISO float btw 80-800 and then lock the exposure ? I'll try it, but I think I will try ISO fixed and manually adjust aperture, 1st. Aperture adjustments on the Nauticam are pretty easy. If that is too cumbersome, I'll try your method.
1st things 1st though. My next dives will be with my filter.
I have considered that the lens of the LX7 is very sharp even at wide apertures so there is not a lot of value closing down manually.