10-24-2021, 10:12 PM
Indeed strange. Looks like the light is indeed hitting some mask somewhere, and diffracting along the sharp edge (at least in the first image). Not sure if that explains the last backlight image.
Maybe you manipulate that mask? (post-it, some black felt stuck on, ...) And see if it affects the image. Then you would know if it is the mask.
Maybe you manipulate that mask? (post-it, some black felt stuck on, ...) And see if it affects the image. Then you would know if it is the mask.