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  1. #1

    Join Date
    Oct 2006
    Shooter
    Medium Format
    Posts
    321

    Cooke Series V lens iris repair

    I have a Cooke Series V 18 inch 15x12 lens and all the iris blades were loose. I took it apart and cannot for the devil of me put the blades in correctly. Each blade has a metal nob at each end, either side and there is a plate with slots to hold them all. It is a nice lens and I don't want to spend the rest of my life stuck on f8....
    Should I send it off to someone clever? Anyone got a diagram, advice?
    Thanks

  2. #2

    Join Date
    Dec 2004
    Shooter
    Large Format
    Posts
    540
    "Each blade has a metal nob at each end, either side and there is a plate with slots to hold them all."

    the anchor plate would be in the barrel with a ring of holes where the blades go into first, the last 3 are always a pain.

    the ends of the blades may be slightly different, and/or the pins may be different lengths or offset, there usually is an inner and outer end.

    Good luck with it.

  3. #3

    Join Date
    Apr 2004
    Location
    Montgomery, Il/USA
    Shooter
    Multi Format
    Posts
    5,100
    The leaves will have a post at the pivot point. That's at the end of the individual leaf. That end will go in the anchor or base plate. The pin that's nearer the middle of each leaf goes into the slot in the aperture ring.
    I usually start by putting the housing on a small can just so I can increase the range of motion of my hands. If it's flat on a desk it's difficult for me to get my hands positioned.
    You will need a pair of tweezers to handle the blades.
    As phfitz mentions the difference in blades. One or two may have a bent tip. These would be the first and last blades. Assuming there are bent tips...........
    With the iris facing up the first blade you install must have the bent tip facing away from you. All of the flat blades one after the other and if there's another blade with a bent tip it will be the last blade installed.
    After the blades are in place, gently position the blade operating ring on top of the blades. This may drive you to distraction. It requires some degree of patience to do jiggling the housing, sneezing, the occasional earthquake are all common things that require starting from scratch. Speaking of scratching, if you have a cat keep it away 'til you're done.
    Heavily sedated for your protection.



 

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