Question concerning lens mount

Discussion in 'Adapted Lenses' started by Selten, Nov 10, 2013.

  1. Selten

    Selten TalkEmount Regular

    188
    Oct 22, 2012
    Rhineland, Germany
    Lusi
    Just won a lens with this particular lens mount. I cannot recognize what exactly it is and what adapter it would need! Any suggestion is very appreticated!

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  2. CGrimm

    CGrimm New to TalkEmount

    5
    Sep 2, 2013
    Without knowing anymore about the lens aside from these two pictures it would appear to be a screwmount lens, which could be M42, M39 or even a T-mount.
     
  3. quezra

    quezra TalkEmount Top Veteran

    924
    Aug 22, 2012
    Or even a C-mount...
     
  4. Selten

    Selten TalkEmount Regular

    188
    Oct 22, 2012
    Rhineland, Germany
    Lusi
    Oh. Did not think to type that - it is a CZ Jena 135mm f/4. I think it could be M42, but not sure. It does not look too typical to my unknowing eyes :/
     
  5. Gandalf

    Gandalf TalkEmount Regular

    59
    Sep 5, 2013
    You're going to have to *carefully* measure the actual threads on the mount to determine the correct identity. There are/were several threaded lens mounts that are/were so nearly the same that they are almost impossible to distinguish visually.

    The list includes:

    M42 (often called the Pentax screwmount) - 42mm X 1mm

    T-mount - usually 42mm X 0.75mm. The earliest T-mounts were 37mm X 0.75mm. I think there may be others that are also called T-mounts, if things aren't muddy enough.

    M39 (Leica Thread Mount, or LTM) - 39mm X 26tpi (turns per inch.) Soviet-era Russia produced some cameras with a 39mm X 1mm mount, good luck telling the difference.

    The C-mount is much smaller: 1" X 32tpi, so that one is easy.