I’ve been using NLP for a few weeks now and have been quite pleased with it. However, during my increasingly long scanning sessions, more and more newton rings have found their way into my scans.
My negatives are scanned on a copy stand, by placing them directly onto a Kaiser slimline plano light box (emulsion side up), with custom-made masks for the respective negative sizes (cut out of black ABS styrene sheets) on top that reveal little more than the frame I am scanning, one at a time. I blow onto the frame before each exposure with a rocket blower to remove dust as best as possible, and swipe the surface of the light box with a microfibre cleaning cloth after each film strip. Doing so helps keep my scans mostly dust-free but, unfortunately, it also means that the light box becomes charged electrostatically, making the negative stick to it. While this is great for film flatness (not that that’s an issue with this setup), it introduces a lot of newton rings.
I thought I was doing the right thing by placing an anti-newton ring glass panel between the light box and the negative (with the dull side facing the negative), but if anything, it’s only made matters worse. What might I be doing wrong here?