Discussion in 'Digital SLR' started by Qbert, Jun 2, 2006.

  1. Qbert

    Qbert Guest

    I read something about the possibility to "re-chip" the lens to avoid or
    solve focusing problems.

    Does someone know anything more about that?

    May I do it by myself? How?

    Qbert, Jun 2, 2006
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  2. Qbert

    Qbert Guest

    Another reason to re-chip the lens could be to re-use old lens with new DSRL
    giving complete compatibility. But it should be expansive. Is it true?
    Qbert, Jun 2, 2006
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  3. Qbert

    Paul Furman Guest

    It is to allow auto metering on newer cameras. It tells the camera what
    the widest aperture is so the camera knows how far to pull the lever
    when stopping down.
    Paul Furman, Jun 2, 2006
  4. Qbert

    Tony Polson Guest

    The only context in which I have seen *re*-chipping mentioned is with
    Sigma lenses.

    Sigma refuses to pay license fees to camera manufacturers to use their
    proprietary electronic interfaces. Instead, Sigma reverse engineers
    the interface.

    This leads to problems when even subtle changes are made by the camera
    manufacturers. Sigma lenses often don't work on new cameras,
    especially those from Canon, and the only way to make them work is to
    replace the CPU in the lens. You cannot do this work yourself. It
    must be done for you by Sigma.

    This is known as "re-chipping", and Sigma normally does it free of
    charge - but only once. If the re-chipped lens later becomes
    incompatible with a newer camera, that's just tough.

    The other possibility is when Nikon owners have a CPU installed in an
    older, manual focus lens to make it work on newer autofocus Nikon
    bodies that are not compatible with manual focus lenses. That would
    be "chipping" rather than "re-chipping". There used to be a company
    that advertised chipping for older Nikkors but I cannot recall the
    Tony Polson, Jun 2, 2006
  5. It's not only Sigma. Before buying a Tokina lens on ebay, I
    questioned THK (Tokina's sole distributor in the US) about the lens
    working properly with my D50. "Most likely it would" was the answer
    but in theevent it did not, a re-chipping of the lens would solve the
    problem for a cost of $ 75.00.
    Peter A. Stavrakoglou, Jun 2, 2006
  6. Qbert

    Qbert Guest

    75$ could be a lot... considering the price of some second hands lens.

    Thx for your answer.
    Qbert, Jun 3, 2006
  7. It certainly is something to consider, but also consider how goo a
    deal you might get on a second-hand lens. I don't know what Sigma
    charges for a re-chipping. I know that this is much more prevalent to
    Sigma, especially for Canon-mount lenses. As another post indicated,
    Sigma reverse engineers the electronics for their Canon mount lenses
    (I don't know if they do so for the other mounts). Any change Canon
    makes to the electronics in a new camera can make a Sigma lens
    inoperable on the new camera. Sigma will re-chip a lens one time for
    free for the original owner.
    Peter A. Stavrakoglou, Jun 3, 2006
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