With all the options out there for post-processing noise removal, do you still have it turned on in camera?
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In-camera NR on or off?
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Which noise reduction are we talking about? There's noise reduction which can be applied to JPGs, If you shoot RAW then it doesn't really matter how you have that set. Then there's what OM call Noise Reduction which is more generally known as dark frame subtraction. That latter, as far as I know, requires the mechanical shutter as the camera takes the image then takes a second one with the shutter closed which (hopefully) captures the sensor noise. This noise is then subtracted from the initial image but I'm unsure whether the result is stored as the RAW file or just used to create a JPG.
Best wishes
Wildwood
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