Slide projector lens focusing problem

Discussion in '35mm Cameras' started by jo, Nov 18, 2003.

  1. jo

    jo Guest

    I have a carousel 4200 projector with an Ecktagraph 100-150mm zoom
    ff3.5 lens. The only way to get a slide in focus is to hold the lens
    abount 3-4 inches away from the projector, so the light goes thru it
    onto the wall. When I put the lens in the projecotr, it doesn't focus
    at all (I've tried from distance of 10 to 20 feet away from the wall).
    I get no image other than different color lights until I take the lens
    out of the projector - and then I get a clear picture. What could
    cause this? Before I spend money on a new lens (shorter and wide
    angle) or take the projector in to be fixed, I could use any
    suggestions. Thanks for your help!
    jo, Nov 18, 2003
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  2. jo

    Tony Spadaro Guest

    This is basically a guess but a fairly educated one. The lens might be
    designed for a long throw - 100 and more feet from the projector. By moving
    it further from the slide you are essentially forcing it to focus closer
    than it was designed to focus.
    Whether it was designed to do this or something happened to it (for
    example it might have been assembled wrong) I can't think of anything simple
    that would fix your problem.
    Tony Spadaro, Nov 18, 2003
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  3. jo

    ROBMURR Guest

    I had the same lens have that problem
    and an element in it had fallen out some
    how. I had to replace it but took it apart
    and used the back half as a nice loupe
    for my lightbox. Try another lens and
    see what happens.
    ROBMURR, Nov 18, 2003
  4. jo

    jo Guest

    I took the lens to a camera store and they told me it was probably
    broken, too. I just got another lens - a 5 inch and it works great!
    Thanks for your help.
    jo, Dec 6, 2003
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