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Thread: LTM Adapters affect focus?

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    Question LTM Adapters affect focus?

    I'm using a CV 35 Ultron on a Minolta CLE and a NEX-7. I see that it's not hitting the infinity mark on the NEX unless I unthread it a bit from the adapter. Will this affect the image on the M body? I was thinking of shimming it so it hits infinity at infinity - good idea?

    thanks.

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    Re: LTM Adapters affect focus?

    Quote Originally Posted by ken_vs_ryu View Post
    good idea?
    NO!

    All that tells you is there is something wrong with the NEX to LTM adapter!

    Shoot a roll and find out. If the RF is OK on the CLE, nothing to worry about.

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    Re: LTM Adapters affect focus?

    Quote Originally Posted by Vivek View Post
    NO!

    All that tells you is there is something wrong with the NEX to LTM adapter!

    Shoot a roll and find out. If the RF is OK on the CLE, nothing to worry about.
    the rokkor-m's hit infinity on the nex.

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    Re: LTM Adapters affect focus?

    If you plan on using the lenses on the RF cam, do NOT shim the lens. If there is a problem with the lens, get it fixed by someone who knows how to do it properly.

    OTOH, it is easy the shim the NEX to M adapter (not LTM as you say- I just realized that) because it is live view.

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    Re: LTM Adapters affect focus?

    Adapters must be the correct thickness for the RF, distance scale, and actual focus to all agree. If the adapter is the wrong thickness, it will affect the RF agreement and actual focus for lenses other than 50mm.

    The Voigtlander adapters and Leica adapters tend to be within specifications, I have seen several Chinese adapters that are not to spec.

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    Re: LTM Adapters affect focus?

    Brian, It appears there is no LTM adapter involved at all.

    What Ken vs ruy is talking about is how his M mount lenses fit on his NEX to M adapter!

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    Re: LTM Adapters affect focus?

    Quote Originally Posted by Brian S View Post
    Adapters must be the correct thickness for the RF, distance scale, and actual focus to all agree. If the adapter is the wrong thickness, it will affect the RF agreement and actual focus for lenses other than 50mm.

    The Voigtlander adapters and Leica adapters tend to be within specifications, I have seen several Chinese adapters that are not to spec.
    The 35 ultron with the voigt 35/135 adapter worked well on the cle but it did not trigger the 40mm frame lines. I'll try the leica 50/75 adapter.

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    Re: LTM Adapters affect focus?

    Quote Originally Posted by Vivek View Post
    Brian, It appears there is no LTM adapter involved at all.

    What Ken vs ruy is talking about is how his M mount lenses fit on his NEX to M adapter!
    The Ultron is an LTM lens, and the Rokkor is M-mount. I assumed the OP was putting an LTM-M adapter on the Ultron, and then use with an M-Mount to NEX adapter. I use a similar setup with u43. Works better with some lenses rather than the 39mm to u43.

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