Vivitar K-mount *almost* compatible?

Discussion in 'Digital Cameras' started by Guest, Mar 17, 2005.

  1. Guest

    Guest Guest

    Hey all. I just got my Pentax *ist-DS and of course tried all my old 35mm
    glass on it. I've run across something rather intersting, however. An old 28-105mm
    Vivitar lens I've got has a slightly larger ridge on the mount that physically hits
    the inside of the *ist-DS. The older P-30T I'd used it with for 15 years has a
    slightly different (and more cavernous) shape inside and was never a problem. Has
    anyone ever seen this:

    http://juneau.me.vt.edu/goodlens.jpg
    http://juneau.me.vt.edu/badlens.jpg
    http://juneau.me.vt.edu/badlens_top.jpg

    It certainly looks like that larger ridge doesn't need to be there. The
    smaller ride on the other lens is plent of protection for the aperture lever. I think
    a quick removal of that piece and a bit of dremel action may be in order.

    I was just curious if anyone else had ever seen something like this.

    -Cory

    --

    *************************************************************************
    * Cory Papenfuss *
    * Electrical Engineering candidate Ph.D. graduate student *
    * Virginia Polytechnic Institute and State University *
    *************************************************************************
     
    Guest, Mar 17, 2005
    #1
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  2. Guest

    John Bean Guest

    On Thu, 17 Mar 2005 12:36:54 +0000 (UTC),
    That's for the Ricoh variant of the K mount. Be vert caretful if you try to
    mount this lens on your DS, it may lock itself to the mount due to a
    non-standard "feature" of the KR mount that may interact with the AF drive
    shaft of the camera.
     
    John Bean, Mar 17, 2005
    #2
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  3. Guest

    Guest Guest

    : Yes, this problem is well known with regards to some Vivitar lenses.
    : Many people have removed or altered this part on Vivitar lenses to get
    : them to fit on Pentax cameras. I don't know exactly which cameras have
    : problems with this aperture lever protector, having never owned one -of
    : the problematic Vivitar lenses myself, but it's been discussed many
    : times on the Pentax mailing list.

    Pentax mailing lists, eh? I hope you aren't referring to one of those
    annoying web-based forum crappolas. I'll try to search through something and get more
    info.

    I'm curious as to the potential "locking onto" the DS. I compared it to an AF
    pentax lens where the drive coupler is. All I see is a very tiny divot on the Vivitar
    lens. I'd find it hard to believe that it could catch the drive gear. I"ll look
    carefully into it.

    Thanks! Hopefully it's modifiable to use on the DS

    -Cory

    --

    *************************************************************************
    * Cory Papenfuss *
    * Electrical Engineering candidate Ph.D. graduate student *
    * Virginia Polytechnic Institute and State University *
    *************************************************************************
     
    Guest, Mar 17, 2005
    #3
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