Lenses, just like any other manufactured product have tollerances. As a practical matter it just isn't possible for any lens manufacturer to be so precise. The fact is that Nikon has never made any statement to this effect and neither has Zeiss. The first thing to do is to ruin the myth that Nikon produced 50 mm marked lenses with a 51mm focal length and Zeiss produced Sonnars and Tessars with a 53 mm focal length. There are some surprises in the data that has been collected. It seemed a good time to thoroughly examine this longstanding question to see what might shake out of it. Just like the old question about whether it is best to store a camera with the shutter discharged or cocked (best discharged), there has always been the question about the differences between the focusing mount and the focusing helical threading on the Contax and the Nikon Rangefinder cameras. Nikon Rangefinder Focusing Mount and Threading Question Solved
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January 2023
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