Komura 200mm f3.5 with unidapter 47mm to exakta mount...what to do?

Discussion in '35mm Cameras and Accessories' started by trythis, Nov 19, 2013.

  1. trythis

    trythis Subscriber

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    What can I do with this lens?

    I have a pristine example of this preset style lens with a Komura 2x adapter, lens hood, and caps with a crappy but original case.

    Is there any hope of making this fit a Nikon, canon FD or Eos mount? I cant find any adapters available anywhere and few people seem to know what they are.
    Could it possibly work on a a mamiya m645? oops wrong forum...:whistling:

    I would like to try and use this on something, but its an odd duck with very few references on the web. I have one very broken Exakta camera and I do not want to buy another 35mm camera just for this.

    I am selling off a bunch of stuff as it is to pay for film.

    If no one has any ideas, I will probably just put it up for trade and see what I get.
     
  2. LiamG

    LiamG Member

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    Exakta's register (flange to film distance) is on the short side- as a rule, you can only adapt to systems with a shorter register if you want to hit infinity. Your can adapt the lens to FD, which has an even shorter register, but none of the other systems you mentioned will work (although, probably some sort of mount conversion to EOS is possible, at great cost- the difference is <1mm). Canon made an adapter for exakta lenses, if you can find one.
     
  3. trythis

    trythis Subscriber

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    The exakta adapter on the lens can be removed. Are there unidapters available anywhere?
     
  4. rthomas

    rthomas Member

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    The way I read this, you have a lens with an adapter for Exacta. Rather than look for an Exacta-to-? adapter, try to find a Nikon F or Canon FD adapter for this lens. Somewhere in my boxes of parts I have a junked 28mm Komura lens with an interchangeable Nikon mount. If I can find it I'll send you the mount for postage.

    Edit: you posted while I was typing. yes, there are used adapters; you might look for them attached to lenses instead of separate.
     
  5. trythis

    trythis Subscriber

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    Awesome, That would be great! IF you find it let me know!
     
  6. John Koehrer

    John Koehrer Subscriber

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    Izzat just a brand name for a "T" adapter?
    Those were pretty common once upon a time.
     
  7. Ian Grant

    Ian Grant Subscriber

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    I have a very early Tamron 135mm lens with a matching 2X converter that sounds similar to the OP's lens (except FL). It's Exacta mount but with an adapter, I remember T mount lenses in my youth but never knew (and still don't) what the criteria is (was).

    They were always stop down or preset.

    Ian
     
  8. Fixcinater

    Fixcinater Subscriber

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    Do you have access to a lathe? You could machine the Exacta adapter down to a distance that would allow you to bolt a cheap eBay M42/EOS (or whatever would be easiest for you to use) adapter to it. More work but would get you a usable lens.
     
  9. pen s

    pen s Member

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    I think Komura's had their own adapter system and it was not 'T' mount. Ran into the same problem with a 300mm Vemar lens I picked up. At a glance I thought it was 'T' mount but the threads were slightly larger. I thought that was strange since I have a 200mm f4.5 Vemar that is 'T' mount.
     
  10. trythis

    trythis Subscriber

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    Its time for pictures: should have started that way...
    IMG_7045.JPG
    In the above photo, you can see the whole lens with x2 adapter
    IMG_7046.JPG
    Above: x2 adapter removed. the tube between silver exakta adapter is hollow and can also be removed with yet another unkown thread type, NOT 42mm
    IMG_7047.JPG
    Above left: T mount (42mm diameter @ .75 tpm) adapter from a different lens. Above right: Unidapter 47mm Diameter to exakta mount.
    IMG_7048.JPG
    Above: whole lens with adapter removed. Black ring is T mount to exakta just to hold the silver one up.

    At 47mm T mounts are just pointless.

    I have a lathe, but it does not do metric threads....:-(
     
    Last edited by a moderator: Nov 20, 2013
  11. Fixcinater

    Fixcinater Subscriber

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    You don't need a thread, just remove the Exacta mount portion of the Exacta silver adapter and epoxy/screw the cheap F-mount or EOS mount adapter to it. I've done that with old FD lenses, cheap K-mount lenses, they all work on EOS bodies after that. I used $2-5 M42-EOS adapters and drilled holes in the adapter face to put screws into the body of the lens.

    Quite secure and reliable in use. Of course, any lens turns into fully manual diaphragm operation at that point.
     
  12. trythis

    trythis Subscriber

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    Cool idea!

    In this case the lens is a preset style and is always fully manual, so no loss there.