I recently purchased my first enlarger, an Omega D2 with a 135 mm Raptar. I'm h aving some difficulty focusing negatives (4x5) at smaller enlargement, i.e., 5x7 , 8x10. What is the relationship bewteen the focal length of the enlarging lens and the minimum enlargement? Do I have some other problem? Thanks in advance; your help is invaluable to us beginners.
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