@heckflosse @nosle @ron
The sharpening settings are simply enhancing the underlying differences from frame to frame making them more visible.
The principal reason is the differences that exist between frames … in this case it looks it is not motion but light intensity differeces … a lot of the checkerboard artefacts dissappear if we apply the “Equalize brightness of frames” option
Something that very few users realise is how difficult it is to achive the perfect pixelshift shot (no movement - no illumination changes between frames).
Even the pixelshif mechanism looks to be inaccurate at times … motion is detected at edges at specific angles only … just like if the sensor movement was not always exactly 1 pixel moving down-left-up
Characteristik example is Dpreview’s ISO100 studio sample for Pentax K-1 … the one under “daylight simulation” suffers from checkerboarding at the resolution trumpet while the same shot but with “LowLight” (tungsten illumination and a lot longer shutter time) is perfect … exactly because the long exposure averages the fluctuations of the illumination …