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  1. #1
    Aristotle80's Avatar
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    Leica screwmount thread wear?

    Hey everyone. I recently joined the Leica screwmount camera club. I shoot them on a new Voightlander body though.

    My question is about wear to the screw threads. I have more than one lens. I'm always very careful when I screw them on and off, no rushing, forcing, or overtightening. If I exercise care when mounting and unmounting a screwmount lens, should I have concern for wearing down the threads? Can I assume that the metallurgy of the threads can handle that wear, or should I keep lens changes to a barest minimum?

    Sorry if this sounds like a silly question, I am mostly used to using bayonet mount lenses.
    I confess I'm a gear nut within my price range. ;)
    Nikon FM2n, FG, FG20, N2000, Nikkormat, Olympus Stylus Epic
    Minox 35EL, Voigtlander Bessa-L
    Yashica-D TLR 6x6, Seagull TLR 6x6
    Agfa Isolette 6x6, Welmy 6x6
    Kodak Tourist 6x9 Anaston lens
    http://www.wendelstout.com/

  2. #2
    GRHazelton's Avatar
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    Somewhere I remember reading that screwmounts are much more tolerant of wear, since the final position of the lens relative to the film plane is determined by the seating of the lens as it is tightened. Wear on the face of the lens mount is unlikely. With a bayonet mount there is the chance that the segments of the mount, for lack of a better word, will over a long time, wear and thus the lens will not be tightly registered to the face of the lens mount. I've yet to read any posts anywhere commenting on either bayonet or screwmount wear. I suspect that the concern is mainly theoretical. Certainly you don't want to overtighten anything on any camera!

    Anyone else have thoughts on this?

  3. #3

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    Think about a piston in the cylinder. I'll bet it moves more times than you will ever change lenses.

  4. #4
    GRHazelton's Avatar
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    Quote Originally Posted by Tom1956 View Post
    Think about a piston in the cylinder. I'll bet it moves more times than you will ever change lenses.
    Well put! And we don't have to worry about changing oil in our cameras.

  5. #5

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    four things to consider
    - avoid cross threading do not use any force when searching for thread entry
    - clean the cameras and the lenses threads occasionally
    - when fitting lens dont knock the focus follower cam
    - some of the FSU lenses have aluminium mounts be more careful

    the screw mount should give less problems than the bayonet it is just slower

  6. #6
    Aristotle80's Avatar
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    Thanks! Terrific.
    I confess I'm a gear nut within my price range. ;)
    Nikon FM2n, FG, FG20, N2000, Nikkormat, Olympus Stylus Epic
    Minox 35EL, Voigtlander Bessa-L
    Yashica-D TLR 6x6, Seagull TLR 6x6
    Agfa Isolette 6x6, Welmy 6x6
    Kodak Tourist 6x9 Anaston lens
    http://www.wendelstout.com/

  7. #7

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    The Leica lens mounts are chromium plated brass. That being said any wear will NOT cause any focusing problems.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  8. #8
    Nathan Riehl's Avatar
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    At least plastic bits aren't a thing to worry about. I picked up a Pronea 6i body for the sake of using up a bunch of APS film I found for super cheap and the lens it came with (28-70 IX) had 2/3 of the plastic bayonet mount ripped off and somehow I didn't notice until after I bought the thing. I'm just thankful I can use the rest of my F-Mount lenses on it.
    Check out my website!

    Yashica T4, Yashica Electro 35 GTN, Yashica-D.

  9. #9

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    As others have said nothing can go out of adjustment with wear to the threads. It is the lens flange that determines the focus distance, and as this can't wear, or only minimally over many decades, so it hardly matters if the threads are sloppy (which I've never come across), just so long as they can tighten up. But the brass threads on many Leica lenses are self lubricating anyway, so even if any chrome plating wears through it doesn't matter, even at the age LTM lenses are now they will still see you out.

    Steve
    http://www.flickr.com/photos/steve_barnett/

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    landscape photographs in and around the Peak District National Park, UK.

  10. #10

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    With your Bessa there are some lenses you should not mount:

    the FSU J12 36mm
    the similar Zeiss prewar Biogon
    physical damage to shutter

    the FSU Russar dont think this fits ie mounts

    some of the Kobalux wides 21 & 28mm also may not fit and their clones ditto

    A Canon LTM body would have similar incompatibility problems.

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