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  1. #11

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    Good point. There are several different ones even for the M645. I have two of the metered prisms and they show no signs of foam degradation.
    - Bill Lynch

  2. #12
    cinejerk's Avatar
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    Yes they have separation problems too. The problem I'm talking about is from foam degradation under the hold down clamp. It shows up as a rectangle in the viewing area. I'm not sure if the newer prisms have that problem or not.
    That's the main problem. There doesn't seem to be a whole lot of information around.
    Here is an example of the problem.

    http://www.pbase.com/pganzel/image/71821169

  3. #13
    ic-racer's Avatar
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    Thank you for the picture. Clearly a problem there.

  4. #14
    cinejerk's Avatar
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    I finally got a response from the guy that was repairing the prism in the above link. He said when he got the silvering cleaned off he cut a front surface mirror and just taped it on.
    I wonder how that compared optically to the original. I suppose that doesn't matter all that much because it doesn't show up in your final image. Unless it impedes your ability to focus in the first place.

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