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  1. #21
    David A. Goldfarb's Avatar
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    Quote Originally Posted by Oren Grad
    I understand, that's the way it's supposed to be. What got me wondering, though, is that if the ground glass register on a III varies enough from one body to another to require body-specific cams for the lenses, why isn't there a problem with interchanging sheet film or roll film holders as well?
    I think the groundglass can be accurate with respect to the film plane without necessarily being uniform from one body to the next with respect to the rangefinder cam and the cam with respect to the follower on the focusing track.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  2. #22

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    Quote Originally Posted by David A. Goldfarb
    I think the groundglass can be accurate with respect to the film plane without necessarily being uniform from one body to the next with respect to the rangefinder cam and the cam with respect to the follower on the focusing track.
    OK, that certainly makes sense as a logical possibility - if GG and film are consistent relative to each other, but the bearing surface against which they're both seated varies with respect to the RF mechanism.

  3. #23
    df cardwell's Avatar
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    Like Historical Literature, it's always helpful to put yourself into the spirit - and technology - of the times when we're figuring out vintage cameras.

    And that's half the fun.

    d
    "One of the painful things about our time is that those who feel certainty are stupid,
    and those with any imagination and understanding are filled with doubt and indecision"

    -Bertrand Russell

  4. #24
    Curt's Avatar
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    Sorry to butt in on the Linhof forum here I don't have one but I was interested in the the technical design of focus cams.

  5. #25
    df cardwell's Avatar
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    It IS interesting.
    "One of the painful things about our time is that those who feel certainty are stupid,
    and those with any imagination and understanding are filled with doubt and indecision"

    -Bertrand Russell

  6. #26

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    anybody know how those cams are made?

    i mean the basic premise. I guess you could measure 5 or 6 points that it would focus on and then chart those points and connect the dots and then machine one to match? or something? reallt like that rangefinder but my lenses have fungus. does anybody refinish lens elements?

  7. #27
    David A. Goldfarb's Avatar
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    Yes, I think that's how you would do it--measure several points objectively and draw a curve to connect them, probably hand finishing it with a file and a hammer to thin and spread out the metal if you file off too much.

    If the fungus is not too bad, you may only need to have the lens cleaned. Even if there is coating damage, the lens may still be quite usable. If the lens needs to be recoated, it can be done by the manufacturer or by Focal Point Lens or Superflat. I believe that Superflat only does coating, not disassembly and reassembly.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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