I would like to do some close-up work with an old telephoto lens that I have. I've done a bit of reading about telephoto lenses and how they are different from non-telephoto lenses. I've read a bit about bellows factors and exit pupil factors and such. There is a lot of math and formulas in these posts that just confuses me more. For calculating the bellows comp factor for my non-telephoto lens, I use the QuickDisc. It's my understanding that this might not work for the telephoto lens. Is this true?
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