I have just bought some lenses for my spotties (50mm f2.0) At �5.50 for the cheapest and not much more for the mint. What surprises me is the design is very different on them. One the aperture ring goes left to right , the other right to left. Is there a site that is the equivalent of Boz's excellent site with info about screw thread lenses? I would like to know if the optics of these are the same or not. Alan
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