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Thread: Who first used Helical Focusing for a photo lens?

  1. 9-May-2020, 11:55 #1
    pgk
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    Who first used Helical Focusing for a photo lens?

    An odd question I know, but does anyone know who first used a helicoid to focus a photographic lens and when?
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  2. 9-May-2020, 17:09 #2
    ic-racer
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    Re: Who first used Helical Focusing for a photo lens?

    Ermanox is the first that comes to mind.
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  3. 10-May-2020, 01:57 #3
    pgk
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    Re: Who first used Helical Focusing for a photo lens?

    Thanks but I'm at 1863/4 so far but just wondering if that was the first date?
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