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  1. #1

    Join Date
    Jul 2011
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    Third party lenses with Mamiya M645 and M645 Pro etc.

    Hi,

    I was curious about the functionality of the metering prism finders (AE and PD) with third party lenses without aperture coupling with the body. Will the metering prism still work?

    I am interested in shooting with Pentacon 6 lenses (the Sonnar and the Flektogon) mounted on the Mamiya 645 body using a generic adapter.

    I would appreciate the info since I don't have a Mamiya body, neither have I ever used one. I was thinking of getting the M645+AE prism finder, which I guess is the cheapest option.

    Thanks.

    Avi

  2. #2

    Join Date
    Oct 2009
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    Central Florida, USA
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    I just tried this with my Mamiya 645Pro with Prism finder N.

    Prism finder N was made for Super but works fine with N. Mamiya says it's OK, too. I have no idea what the difference is between the ones made for Pro and N type.

    I purposely mounted the lens incorrectly so that the pin is not caught between the prongs of the lens. No, it doesn't work as a metering prism. No matter where I set the aperture, the shutter speed reading stayed the same. (which makes sense)

    Anything else you want me to try?
    Develop, stop, fix.... wait.... where's my film?

  3. #3

    Join Date
    Jul 2011
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    Thanks a lot. Nopes...that is the main thing I wanted to confirm.

    I am disappointed that the prism won't meter with third party lenses.....a minor blemish on what appears to be a excellent mf kit..

    Avi

  4. #4

    Join Date
    Oct 2009
    Location
    Central Florida, USA
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    You can always pickup a non-metering prism and a second hand light meter.... The metering prism on these things are pretty primitive. Since you shoot LF, I'm guessing you already have a light meter, no?
    Develop, stop, fix.... wait.... where's my film?



 

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