Does the same little pattern repeat elsewhere on the image ? Just that I saw a faint visual 'echo' on your image.
I've got a water damaged camera that still works but shows a repeating pattern over the whole sensor on long exposures.
Still ok for normal pix and movies if you know how to get round the limitations but long exposures show the pattern. And longer the exposure , the longer the pattern.
I'm guessing my camera has some electronics damage from the water. Maybe something similar on yours.
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