Quote:
Originally Posted by luigi bertolotti
That is the problem... the above posted formulas include "magnification"... has it to be considered as the "magnification ratio" I achieve (the 1:2 of the example) or the magnification of the lens in itself, clearly related to focal length ?
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m is the ratio between object size and image size: in your example, 0.5.
As ghammer says, the formula I posted is an approximation. It's good enough for everyday "macro" work.