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  1. #11
    Senior Member

    Re: I want to buy a film camera with lenses which will attach to a Nikon D40

    What is it about those pre-ai lenses that can cause damage? That'd be good information for me to have.


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  2. #12
    Senior Member
    480sparky's Avatar

    Re: I want to buy a film camera with lenses which will attach to a Nikon D40

    Quote Originally Posted by D200freak View Post
    What is it about those pre-ai lenses that can cause damage? That'd be good information for me to have.
    It's from the way the original F-mount lenses were manufactured, and how Ai'd lenses were changed to 'key' the camera as to the lens' maximum aperture.

    Originally, Nikon made their F-mount lenses with a solid ring around the mount. Note how the black portion of the barrel in the lower right extends past the silver part of the lens mount... it's a solid ring all the way around the lens.




    When they created the Ai system (Automatic Indexing), they needed a way for the lens to 'tell' the camera what the maximum aperture is on the lens. This was done by removing most of that ring, and leaving the end in a position that was related to the lens' maximum aperture.




    They added a ring around the camera's lens mount to 'receive' this raised portion of the lens. Take a look at your camera, with the lens removed, and you'll see it at about the 1:30 position. You can take your finger and gently move it.




    The Ai lens 'keys' this ring, and how much it moves 'tells' the camera the maximum aperture of the lens.



    Todays' current crop of G lenses do not have this ridge or key. They communicate their specs electronically through the contacts inside the lens mount of the camera and the little 'BB's' or 'ball bearings' on the lens.

    A pre-Ai lens, not having this notch in the mount, will push in on the tab on the camera before you can insert the lens far enough to turn it to mount it. Here's, I've taken my pre-Ai 28mm Nikkor and just set it on the camera, not applying enough pressure to damage the ring on the camera.



    This is what will be damaged by forcing a pre-Ai lens onto a modern camera.... the Ai ring around the camera's mount.

    Some DSLR bodies do not have the indexing ring, so they can accept pre-Ai lenses without damage.
    Last edited by 480sparky; 12-16-2015 at 06:52 PM.
    Don't mind me... I'm out roaming around somewhere between Zone III and VII.


    Go forth and actuate!


    My Website.

  3. #13
    Senior Member
    Horoscope Fish's Avatar

    Re: I want to buy a film camera with lenses which will attach to a Nikon D40

    Quote Originally Posted by D200freak View Post
    What is it about those pre-ai lenses that can cause damage? That'd be good information for me to have.
    A pre-AI lens will press down on the minimum aperture switch which will damage the electrical contacts and/or chew up the switch itself as you rotate the aperture collar.

    The end result will be an un-resolvable "FEE" error (at best).
    ~ Paul
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  4. #14
    Senior Member
    480sparky's Avatar

    Re: I want to buy a film camera with lenses which will attach to a Nikon D40

    Quote Originally Posted by Horoscope Fish View Post
    A pre-AI lens will press down on the minimum aperture switch which will damage the electrical contacts and/or chew up the switch itself as you rotate the aperture collar.

    The end result will be an un-resolvable "FEE" error (at best).
    And worst case....... you send the camera & lens (now hopelessy jammed together as one) to a repair facility.
    Don't mind me... I'm out roaming around somewhere between Zone III and VII.


    Go forth and actuate!


    My Website.

  5. #15
    Senior Member

    Re: I want to buy a film camera with lenses which will attach to a Nikon D40

    Good to know. Thanks.





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