I want to use a Sinar Norma. The book I was given with the camera says that exposure needs to be increased because of the "bellows factor" and gives the formula Bellows Length squared/Focal Length squared = Exposure Increase. I can measure the bellows length, but I don't know what Focal Length means. Is that the number on the lens, as in 1:4.5/150? Would the Focal Length be 4.5? Thank you for your patience. I am very much a beginner, and this camera will keep me humble for a long, long time.
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