Strange pattern on print
I got this weird pattern, pictures show a small crop from print. Most visible towards corners of the print and in mid tones. The average edge length of these artefacts must be 0.2-0.3 mm on the negative, if they are on the negative. Not visible through the grain focuser, nor with loupe. I've printed other negatives from the same film, but not as large and not as high contrast, and see nothing on them.
What could this be? Reticulation? Something to do with the anti-newtion glass carrier which has a texture roughly the right size?