I'm selling some very old waterhouse stops and got a question that I don't really understand. It was written in good English, so the questioner is not crazy. Perhaps I am.
He asked of what use are the waterhouse stops in question if they are not of a standard "OD" (presuming Outside Diameter). I'm puzzled. Were there standard ODs for very old (probably pre-1910) brass, shutterless camera lenses? (These did not come from repro lenses.) It was my impression from looking at the box of junque lenses that they were made in arbitrary barrel sizes.
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