Quote:
Originally Posted by jaapv
As DOF is a function of magnification there is a difference in DOF between an image of the same size taken by different lenses. The magnification of fore- and background is different, even if the subject is the same size on the sensor. However, in macro work, DOF is so narrow that it does not really make a lot of difference.
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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 ?