Think Leica Screw Mount was 39mm.
The FTL used 42mm with a lock. Preceded the ES mount Pentax later
developed. By incorporating a lock, Olympus introduced a manner to
determine aperture setting of the lens.
Brian P. Huber
> I thought that M42 was Leica's original screw mount, that
> everyone (for free)
> used afterwards...
>
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