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MD mount issues

Discussion in 'Adapted Lenses' started by ke7dbx, Jul 28, 2011.

  1. ke7dbx

    ke7dbx Mu-43 Regular

    76
    May 11, 2011
    I am having an issue. I have 2 lenses, both labeled MC. But only one will mount meth my adaptor. It is a Rainbow MD to micro 4/3. then I also have a lens labeled MD and that will not mount ether. I don't have this issue with my om adapter. Help!
     
  2. Alanroseman

    Alanroseman Super Moderator Emeritus

    Dec 21, 2010
    New England
    Hi, are these Rokkor lenses? As in MD Rokkor - MC Rokkor?
     
  3. ke7dbx

    ke7dbx Mu-43 Regular

    76
    May 11, 2011
    No clue. The two lenses are labeled MC. One mounts, the other does not. As I understand it there is no other type with that use MD and MC on mounts.
     
  4. addieleman

    addieleman Mu-43 All-Pro

    Aug 5, 2010
    The Netherlands
    Ad
    Often the MC designation on a third-party lens means multicoating, not Minolta MC mount, especially when MC is mentioned at the front near all the other markings of focal length, speed, serial no. etc. You often find a mount indication near the bayonet like M/MD, PK etc. Try to compare both bayonet mounts and you'll most likely see differences.

    Nitpicking, the Minolta mount used for all manual focus cameras is the SR mount. Lenses can be Auto, MC or MD, but they all use the same bayonet configuration apart from coupling lugs for light metering and focus assist (some late MD lenses).

    Another possible cause of mounting problems is too large mechanical tolerances in the adapter. Some of the 5 Minolta SR-mount adapters I have need to have the locking lever depressed while mounting the lens. This isn't supposed to, but cheap adapters aren't always manufactured to very tight tolerances. :wink:
     
    • Like Like x 1
  5. Alanroseman

    Alanroseman Super Moderator Emeritus

    Dec 21, 2010
    New England
  6. Dan Ka

    Dan Ka Mu-43 Regular

    128
    Jan 11, 2011
    Northeastern Ohio
    Take a look at this thread I posted. Do the lens mounts match, especially the offset locking notch in photo 3. From the research I did, that is the defining characteristic of a Minolta mount. Others usually have the locking notch in the center or at the end. Also see the links in the last 2 posts. HTH

    https://www.mu-43.com/f40/minolta-mount-13955/
     
    • Like Like x 1
  7. ke7dbx

    ke7dbx Mu-43 Regular

    76
    May 11, 2011
    Here is the images.

    untitled_by_mackingster-d41yard. untitled_by_mackingster-d41yak0.

    ---

    untitled_by_mackingster-d41yae7. untitled_by_mackingster-d41ya7y.
     
  8. Alanroseman

    Alanroseman Super Moderator Emeritus

    Dec 21, 2010
    New England
    From what I can see, I'd say the MC means multi-coated. there is only 1 image of the end we need to see, and from that angle it does not look like a Rokkor mount.

    I could easily be wrong, as it's difficult to get any sense of the mount from that single image.

    Alan
     
  9. ke7dbx

    ke7dbx Mu-43 Regular

    76
    May 11, 2011
    There is no other labeling to say what these two lenses are. The only other thing I could think of. Could it be a Nikon mount?
     
  10. addieleman

    addieleman Mu-43 All-Pro

    Aug 5, 2010
    The Netherlands
    Ad
    I'm 99.9 % sure that both are Nikon F mount, the first is AIS, the second one is AI. The coupling fork with the holes is a give-away. Compare it to this one, a rear view of a Nikkor 24mm 1:2.8 AIS (coupling fork removed).

    <img alt="Nikkor 24/2.8 AIS" src="http://www.smugmug.com/photos/1140469748_SG22D-M.jpg" border="1" />
     
  11. ke7dbx

    ke7dbx Mu-43 Regular

    76
    May 11, 2011
    Thanks for the ID.