Help with screw size, Minolta 80-200

Discussion in 'Adapted Lenses' started by CharlieL, Sep 20, 2014.

  1. CharlieL

    CharlieL Mu-43 Veteran

    237
    Aug 2, 2014
    Burkburnett Tx USA
    Charlie
    I picked this lens up at the thrift store it is a Minolta 80-200mm f 3.5. It is missing a screw on the ring for the tripod mount. I cannot find a screw locally or in my junk drawers. Could somebody tell me what size screw it is or point me in the right direction on where to get one. Thanks in advance.

    P9202595.
     
  2. usayit

    usayit Mu-43 Hall of Famer

    Drill and tap... at least that's I would do if I couldn't find one locally.
     
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  3. CharlieL

    CharlieL Mu-43 Veteran

    237
    Aug 2, 2014
    Burkburnett Tx USA
    Charlie
    I have been thinking about that. There is not enough room underneath the ring for me to tap threads all the way through without taking off the ring. I am not sure how to take off the ring. If I can not find a screw I might get adventurous and try tapping. I had rather buy a screw than a bottoming tap.

    Thanks for the input.
     
  4. dpaultx

    dpaultx Mu-43 Regular

    58
    Jan 19, 2014
    North TX
    It's almost certainly a metric screw size which is going to make finding one even more difficult. What function does the screw serve? Is it like a thumb/set screw to stop the tripod ring from rotating?
     
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  5. CharlieL

    CharlieL Mu-43 Veteran

    237
    Aug 2, 2014
    Burkburnett Tx USA
    Charlie
    Yes, the screw secures the ring to the body. I assume that is way it is supposed to work. The ring is a loose-ish fit on the body of the lens.
     
  6. usayit

    usayit Mu-43 Hall of Famer

    I haven't encountered a lens that the ring couldn't be removed easily as designed. In some cases, there is a slot and peg underneath the ring that requires you to position the ring in a certain way before it will slide off. Typically 180 degrees from the "normal" position in which the DOF scale markings are on top.
     
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  7. dpaultx

    dpaultx Mu-43 Regular

    58
    Jan 19, 2014
    North TX
    Yeah . . . Here's a picture of one for sale on eBay that shows the screw in place. It's definitely a thumb screw, maybe a 4mm but probably a 5mm. At least you now know what it looks like. Maybe you could email the guy and ask him to measure it.



    dp
     
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  8. CharlieL

    CharlieL Mu-43 Veteran

    237
    Aug 2, 2014
    Burkburnett Tx USA
    Charlie
    Here is an update for the really bored or curious.

    I ended up tapping the tapping the hole to a standard screw size. I could find the right diameter metric screws, but not the right pitch.

    The ring was captive on the lens I had to remove the mount, aperture ring, and retaining collar. It all went smooth other than wrestling with the pesky little detent ball for the aperture ring. It took me several tries to get it right.

    I am not sure it was all worth the effort, but I learned a little bit and stayed out trouble for awhile.

    P9232598.