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I've also been excluding as much light as possible, including room lighting, but equally problematic is the light box bouncing back from the phone front etc.
I'm convinced that background light can be reflected from the surface of the negative - especially from 'black' areas - possibly reducing the image contrast, and fooling the camera meter.
Keep in mind that my approach is very much a lash-up that owes more to wishful thinking than optical physics.
MrE
@shinkuu_kiss
i "scan" the same way and just do what @sohi said, i think it's an advantage of using digital camera + macro lens that you can work with the negs like this
i also have to cover the rest of my light source to get decent results with my current setup, but it did't make a big difference with the camera/lens i was using previously so results may vary?
this neg was scanned badly to begin with but it's a lot better just after setting the black/white points
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