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Hi Wes,
Firstly I’m not going to pretend that I “ know “ what is causing that pattern so please take my suggestion with a grain of salt.
I did a little reading about your camera ( assuming it’s the Olympus you list in your signature ). I think the pattern has been caused at a sensor level. I have two theories. 1 is that if you’re using a really high ISO, you maybe amplifying a pattern in the sensor construction that normally wouldn’t be noticed ? My second guess would be that I noticed your camera has mechanical image stabilization for low light ? Is it switched off ? Can it be ? This pattern could be caused by the image shift of the stabilization? I have picked my own holes in my own arguements but I hope maybe this might help ?
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