View Full Version : 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?
ic-racer
9-May-2020, 17:09
Ermanox is the first that comes to mind.
203581
Thanks but I'm at 1863/4 so far but just wondering if that was the first date?
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