Originally Posted by
abruzzi
I recently bought a Nikkor-T with 360 and 500 mm rear elements. I wasn’t too worried that it didn’t have the 720 element, given that I can’t really use it. But I was wondering, the 720 shows a flange distance of 469mm. My Technikardan officially has 485mm of extension. Obviously 19mm, if I even have those 19mm, isn’t going to focus much closer than infinity. But say I put the lens on a 50mm top hat board, so I have just shy of 70mm on a 720mm lens. So the question is can you calculate how close that 70mm would get me? I’m sure there is a relatively simple formula to determine this, but I don’t know what it is.
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