What's the functional difference between Nikon PK-11 & PK-11a Extension tube

Discussion in 'Nikon' started by Norm Dresner, Oct 10, 2005.

  1. Norm Dresner

    Norm Dresner Guest

    I need an extension tube to use a Nikon PB-4 bellows on a Nikon N90(s) body
    and the "recommended" one is the PK-11a but PK-11 are more plentiful and
    cheaper. Since I don't care about any AE or AF issues through the bellows,
    what, if anything, will be the functional difference between the two
    different styles of extension tubes?

    Norm Dresner, Oct 10, 2005
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  2. For an AF camera like the N90 you need the PK-11a. The older
    version will scrape and like damage the camera's AF contacts.

    Christoph Breitkopf, Oct 10, 2005
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  3. Norm Dresner

    Gordon Moat Guest

    On the PK-11A, just a bit more material is machined off the bayonet. That
    removed material prevents it from shorting out the contacts on some cameras,
    though I am not entirely sure if the N90S is one of the problem cameras. You
    should be able to find a good used PK-11A for under $30 including shipping.
    Gordon Moat, Oct 11, 2005
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