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Author Message   Nikos Tinkerer Username: Nikos Post Number: 22 Registered: 07-2006 Rating: N/A Votes: 0 Posted on Thursday, September 20, 2007 - 11:27 pm:    The other day I was using an Exakta mount semi-automatic Biotar, mounted on my old Topcon RE Super. As there is no linkage of any kind between lens aperture and camera, I had, after focusing, to take a stop down reading. I noticed an appreciable shift of focus and I wonder whether this is a true shift of focus or just an optical illusion. So, is there a case for stop down focusing? Nikos