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  1. #1
    Field's Avatar
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    Rotar 135mm 4.5 FC lens, contax or exakta mount?

    Anyone ever heard of one of these? I can't figure it out. It has three wings, so not M bayonet mount. Not sure what it is exactly.

    When you focus the entire front of the lens elements, as 12 blade aperature (4.5-22) seem to move all at once. It is old, black, brassing. It has a metal gray hood that says "lens made in france" but may not be original.

    Any ideas? It is rather small, I thought C-mount maybe. I don't have any pictures (yet).

  2. #2
    Field's Avatar
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    Click image for larger version. 

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  3. #3
    Field's Avatar
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    Hood has nothing to do with it, it was made in Japan.

    It is TINY as you can see, for 135mm it is itsy bitsy sized.

  4. #4

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    Having owned both Exaktas and Contaxes, I can definitely say that it is an Exakta mount. Contax mounts have a reverse external bayonet pattern with an internal bayonet that activates the rangefinder mechanism. This also has the screw (pin) outside the bayonet that the clip on an Exakta will snag to lock the lens in the correct position.

  5. #5
    Field's Avatar
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    The size of it though, can it cover a 35mm film plane?

  6. #6
    Wade D's Avatar
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    It does look like an Exakta mount. Not all that small for an older 135 lens. I have an old Vivitar 135 for my Exakta that is about that size. Should cover 35mm no problem.

  7. #7
    Rol_Lei Nut's Avatar
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    As mentioned, it's not really that small.
    Remember, it's a f/4.5 and there are no auto-diaphragm mechanisms involved.
    I have several lenses of that type of around the same size, so it is very likely that it is designed for and covers 24x36mm (also given its Exakta mount).
    M6, SL, SL2, R5, P6x7, SL3003, SL35-E, F, F2, FM, FE-2, Varex IIa

  8. #8
    Field's Avatar
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    It is indeed Exakta.

  9. #9
    Ian Grant's Avatar
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    It looks the same size as my very early Tamron 135/270 in Exacta mount, it splits to add a dedicated 2x converter.

    Ian

  10. #10
    Field's Avatar
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    I don't get the impression that it splits. Also the construction is pretty different, even if the elements were the same.

    How does your Tamron perform?

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