Originally posted by audiobomber I read most of the article and it's good. I don't get this statement though:
"As a rule, a shorter focal length increases magnification while decreasing working distance from the lens to the subject. Conversely, a longer focal length allows for less magnification and greater distance between the subject and the lens."
I agree about working distance, but not focal length. A 35mm lens that does 1:1 macro has equal magnification to a 200mm lens that does 1:1 macro. Focal length is irrelevant to magnification.
Thanks for the comments and I guess what I was trying to say is that for a given length of bellows extension, the shorter the lens focal length the greater the magnification
ability. If I fully extended my Asahi Pentax Auto Bellows and then placed a 50 mm lens on the end, there would be more magnification than if I placed a 135 mm lens given the same bellows length.
When I want the greatest magnification I will fully extend my bellows and use the shortest enlarging lens I own (in this case a 50mm lens - the longest enlarging lens I own is 135).