I know that when a lens is at its focal length from the film plane, it is focused for infinity. IE and 90mm lens 90mms from the film plane. But how do you find out what the lens to object distance is when that lens is focused toward infinity? What got me thinking about this is the wide angle lenses on 35mm. Now a 16mm fisheye on 35mm will have everything in focus after 3 or 5 feet or something ridiculously short like that, so if the object is 5 feet from the lens, you just set the lens for that sideways 8 and your done focusing. how could i figure this out for a 90mm super angulon?
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