Viofo A119 V3 HDR/Not HDR, 60fps/30fps, CPL/No CPL

it is not possible to get the best performance from all aspects from the same position.
Incorrect, the correct position is always for the polariser to be aligned perfectly vertical, the only reason to adjust it would be if the camera was not mounted perfectly horizontal - you would still need the polariser to be vertical even if its frame wasn't.
 
The established trick was to place a sheet of white A4 on the dash, directly under the dashcam, and rotate the CPL till the paper was darkest.

I think that is what is being said.
 
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