I've heard that you have to take the focal length of a lens and times it by two to reach a 1:1 magnification. So I gather a 90mm lens would need 180mm bellows length. In terms of varying focal lengths is the practical difference the distance of the camera to the subject? I'm most curious if a wide angle lens forces you so close that you obscure the light source / create a shadow.
Also, if my max bellows is 330mm, any thoughts on a good lens for flowers? I know that a process lens is optimized for a flat surface.. but would something like that still work? and in a short enough focal length to make this doable?
Thanks!
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