Hello, I wonder if anyone can assist with this. I have just acquired a Voigtlaender Euryscop series 1V, #3 lens. I understand this to have a focal length of 11.5" and it has one original, full aperture stop. Measuring the hole in this stop and doing the math, gives an answer of 6.5. Reading up on this in old archives , it should be an f6 lens, perhaps not enough difference to worry about! If I am trying to replicate the original set of stops, how many should there be for this lens, and what sort of ratio did they stop down to? I would be most grateful for any help or advice. Colin Myers
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