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Can someone explain the math behind what magnification ratios to use for scanning film with a digital camera?
I've got an APS-C body and a vintage macro lens + ext tube which allows for magnification to be as high as 1:1, and I'm assuming the crop sensor doesn't affect that ratio¿
But 1:1 on APS-C will mean I'd be focusing on less than the entire area of the 35mm exposure, right?
I always noticed peopled mentioning needing a true 1:1 macro lens for this type of digital film scanning setup, and now it's seeming like that's not truly what I need.
