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    • M39x0.5 adapters

    Adapters with M39x0.5 thread

    This thread was used as a filter thread on some lenses, and may be marked as E39.

    Historically, "E" is taken from the German word "Einschraub-" meaning "threaded", and the different letter was used to distinguish it from the L39 mount thread (M39x26tpi).

    Nowadays,  many people prefer to think about this "E" as of "fine pitch", since a much more common pitch for filter threads is 0.75mm (especially for threads starting from 43mm and larger).

    Known compatible lenses:

    • Angenieux Type R2 2.2/18.5mm
    • Leica Summicron 35mm
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