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  1. #11

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    are the 6x9 and 4x5 cams interchangeable?

    are the 6x9 and 4x5 cams interchangeable?

  2. #12
    David A. Goldfarb's Avatar
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    Quote Originally Posted by bicycletricycle
    are the 6x9 and 4x5 cams interchangeable?
    No. The Linhof 6x9 cameras use three-lobed cams for three different lenses. You can rotate the cam to the lens you're using. On the Linhof 4x5" cameras there is one cam per lens, so you have to switch cams when you switch lenses, if you want to use the rangefinder.
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  3. #13

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    6x9 cams

    does anybody still make these cams for newer lenses?

  4. #14
    David A. Goldfarb's Avatar
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    It depends. If you have a Tech IV 4x5 or Tech V 6x9 or 4x5 or Master Tech 4x5, then Marflex or any other Linhof service (depending on what country you're in) can make cams for many modern lenses.

    Richard Ritter makes cams for the 4x5" Tech III. I asked him once if he made them for the 6x9 Tech III or IV, and he recommended just looking for one with a set of three cammed lenses, implying that it was not economical for him to make cams for the 6x9 cameras.
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  5. #15

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    Quote Originally Posted by bicycletricycle
    Also if the nature of the problem is that they are slightly different focal legth than should the rangefinder be off the same amount all the time. So you could always focus a little short and it would be fine?
    No. There are two key parameters involved in setting up the rangefinder system, infinity stop position and cam slope. Incorrect register of the ground glass results in a constant error that can be compensated by resetting the infinity stops for the lens. But change in focal length requires a different cam slope - that is, the error will be proportional to focus travel rather than constant.

    Actually, that raises a different question for you Technika III mavens: just how variable was the ground glass register? Enough to cause a problem with film plane register when swapping Rollex backs?

  6. #16
    Curt's Avatar
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    The cam on my 2x3 Busch is straight with no lobes, wouldn't you think that it would be linear? It has the original 101mm lens and a Kalart so it's original equipment. I was thinking about putting another lens on it but I had such fun with the tuneup adjustment of the existing lens I just put it aside. Besides the lensboard has four screws that are specific to the camera and I haven't got the time to find new ones. I was thinking about replacing them with four that would have knurled heads to make field changing easier. I too am not sure about other cams for other lenses. Given enough time and experimentation I could figure it out.

  7. #17
    df cardwell's Avatar
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    CURT: I don't know if I understand you.

    A Busch cam, or Graflex, is linear. A Linhof is NOT. The Linhof system is also more accurate.

    OREN: I don't have one to check, but if reason (and memory) serve, the groundglass register = film plane.
    "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

  8. #18

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    i think that i may try to make my oen, cant be to hard, can it?

    anybody tried making one? anybody know how they are made?

  9. #19
    David A. Goldfarb's Avatar
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    I think there are instructions somewhere on the net for making MPP and Super Graphic cams.

    If the point of having a Linhof with cammed lenses is to have a really accurate rangefinder, though, it's probably best to leave it up to a shop that can do it precisely and accurately with factory equipment.
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  10. #20

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    Quote Originally Posted by df cardwell
    OREN: I don't have one to check, but if reason (and memory) serve, the groundglass register = film plane.
    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?

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