Originally Posted by
Dan Fromm
Magic formulas:
rear node to film plane distance = f*(m +1) where f = focal length and m = magnification
front node to subject distance = f*(m + 1)/m
film plane to subject distance = rear node to film plane distance + internodal distance + front node to subject distance
Most discussions neglect internodal distance, which is usually small. Few of us know exactly where our lenses' nodes are. For most of the lenses used in LF photography, the nodes are close to the diaphragm; this is not the case with telephoto lenses.
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