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  1. #1
    winger's Avatar
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    Adapter for Pentax K mount to screwmount body?

    I haven't any mention of the existence of such a thing, but would LOVE to use some of my more recent lenses on my old H1a. I also know this was one thing my dad really wanted back in the day. Is there any way to do it DIY-style?

  2. #2
    frank's Avatar
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    Not possible based on what I know. It's like the ltm to M adaptor, only works for screw mount lens to bayonet style body, not the other way round.
    My blog / photo website: http://frankfoto.jimdo.com/

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  3. #3

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    Quote Originally Posted by winger View Post
    I haven't any mention of the existence of such a thing, but would LOVE to use some of my more recent lenses on my old H1a. I also know this was one thing my dad really wanted back in the day. Is there any way to do it DIY-style?
    Machine a K-mount flange to put on the H1a body in place of the 42mm screwmount - I measured this out and IIRC it's possible but rather impractical.
    There's a screwmount lens to K-mount body adapter, Pentax though of this while designing the K mount. But, the diameters are wrong to go the other way.

  4. #4
    adelorenzo's Avatar
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    Pentax K mount and M42 mount have the exact same flange focal distance. So you'd have figure out an adapter that kept the lens in the exact same spot.

  5. #5
    frank's Avatar
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    Quote Originally Posted by adelorenzo View Post
    Pentax K mount and M42 mount have the exact same flange focal distance. So you'd have figure out an adapter that kept the lens in the exact same spot.
    This is why my 50f1.4 Takumar screw mount lens won't focus to infinity on a k mount body.
    I guess Leica was smart to add a millimeter or 2 to this distance on their M mount bodies. Their screw mount lenses do focus to infinity with the ltm to m mount adaptor.
    My blog / photo website: http://frankfoto.jimdo.com/

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  6. #6

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    Quote Originally Posted by frank View Post
    This is why my 50f1.4 Takumar screw mount lens won't focus to infinity on a k mount body.
    Something is wrong with your equipment. A properly-made M42-to-K adapter on a K body in proper adjustment should allow focus to infinity. The adapter is intended to sit within the bayonet mount and not add anything to the flange-to-film distance.

  7. #7
    frank's Avatar
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    Quote Originally Posted by Oren Grad View Post
    Something is wrong with your equipment. A properly-made M42-to-K adapter on a K body in proper adjustment should allow focus to infinity. The adapter is intended to sit within the bayonet mount and not add anything to the flange-to-film distance.
    My adaptor definitely has a lip that adds to the flange to film plane distance. It's not a Pentax brand, just a cheap ebay purchase.
    My blog / photo website: http://frankfoto.jimdo.com/

    Openly biased and unabashedly
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  8. #8

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    Quote Originally Posted by frank View Post
    My adaptor definitely has a lip that adds to the flange to film plane distance. It's not a Pentax brand, just a cheap ebay purchase.
    My Pentax-branded one has no lip and sits perfectly flush with the K body mount.

  9. #9
    frank's Avatar
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    My adaptor bad.
    My blog / photo website: http://frankfoto.jimdo.com/

    Openly biased and unabashedly
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  10. #10

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    Quote Originally Posted by Oren Grad View Post
    My Pentax-branded one has no lip and sits perfectly flush with the K body mount.
    Yup.

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