canon fd 1.4 lens iris not working, any ideas?

Discussion in 'Canon' started by johnsonholding, Feb 3, 2006.

  1. Just wondering if there is a fix to this problem? I have tried the
    aperature lever in several positions to see if this help. Nothing. I
    cannot see the iris closing at all, no matter whihc lever I push. Any
    johnsonholding, Feb 3, 2006
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  2. johnsonholding

    Skip M Guest

    Mount it on the camera. It won't work dismounted...if I remember right.
    Skip M, Feb 4, 2006
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  3. It should work for reverse macro, if the pins are pressed in and the
    aperature lever is over, right?
    johnsonholding, Feb 4, 2006
  4. johnsonholding

    Tony Polson Guest

    With lenses 'of a certain age', it is very common for lubricant grease
    to find its way into the iris diaphragm and jam it. This can be cured
    by getting a qualified camera technician to service the lens (CLA).
    Tony Polson, Feb 4, 2006
  5. well, when I bought it, it was supposedly 'working' so I will take it
    back and get a refund - I am not up to paying $50-75 to repair a lens
    that should be working in the first place. thanks for the tip though.
    johnsonholding, Feb 4, 2006
  6. johnsonholding

    Doug Robbins Guest

    This is normal for an FD lens. Read the follwing from a posting by "Jim
    Phelps" made on 12-5-02.

    "You can check the functionality of the older style Canon FD lenses by
    releasing the mount lock by depressing the catch located on the back of the
    mounting ring at the top in the notch for the bayonet mount. The rear lens
    cap can be used to do this as well as a long fingernail. This ring will
    turn counter clockwise (when viewed from the back of the lens) and you need
    to turn it at least 1/8 of a turn. Then there is a lever at the bottom of
    the rear mount that you need to move to the right. This lever, if not
    moved, will normally keep the aperture wide open for composing and focusing.
    When you move this lever to the right, it will close down the aperture and
    you can cycle through the range. When you do this a lever on the left side
    should move up and down to correspond with the aperture movement. This
    lever coupled with the 'circle' in the light meter to place that circle over
    the needle for correct exposure. It also was used by the automatic metering
    modes so the camera could set the correct f-stop or know what f-stop was
    chosen. Let go of this bottom lever quickly so you can see if the diaphragm
    is sticking or not. The diaphragm should spring back very quickly, if not,
    the lens needs a cleaning."

    Mount the lens on a camera and you should see the aperture change as the
    aperture settings are changed and the shutter is tripped. It will close down
    from full aperture to the set aperture and return. If it does this instanly
    the lens is probably fine.

    Doug Robbins, Feb 4, 2006
  7. johnsonholding

    Doug Robbins Guest

    Also this posting by "Malcom Stewart" on 12-4-02:

    "Original FD series (now known as breech-lock, BL) have aperture fully open
    when off the camera. On later FD lenses (sort of bayonet-like) the aperture
    goes to a mid value when lens is taken off camera. In both types the
    aperture ring is disabled. From memory, rear lens caps differ subtly
    between the two types. "

    Doug Robbins, Feb 4, 2006
  8. I have managed to depresses the little switch under the breech lock and
    when I turn the iris on the barrel, the smaller aperature switch moves
    freely and nicely - but the iris in the camera does not open or close.
    johnsonholding, Feb 7, 2006
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