Hello Per, thanks for the hint (I don't know why I can't reply to your answer directly). After switching to 100% I see the "moire" also on my smaller display. Although the pattern looks like banding I highly doubt it as I cannot see it when openening the picture with any other apps (MAC Preview, Pixelmator Pro, Luminar Neo). I cannot image that my Olympus EM1m3 shows such ugly banding when using 1600ISO and an exposure of 1.6 s .... KR Bernd
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