Super stiff aperture ring for 5cm Collapsible Summicron

Discussion in 'Rangefinder Forum' started by Robert Oliver, Jul 31, 2011.

  1. Robert Oliver

    Robert Oliver Member

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    kind of a newb with the rangefinder....

    Is there a home fix for a super stiff aperture ring on my 5cm Summicron, or am I going to be sending it in.

    Tired of wearing the skin off of my fingers trying to go from f2 to f8.

    I mean it's really stiff.
     
  2. karl

    karl Subscriber

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    Just send it to someone for cleaning and re-lubrication. You'll be glad you did.
     
  3. Worker 11811

    Worker 11811 Member

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    DO NOT force it! If it takes more than fingertip pressure to move the aperture ring you are likely to break the internal parts.

    Ask me how I know this... :sad:
     
  4. rulnacco

    rulnacco Member

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    Yes! Have it serviced. Randy can no doubt relate a horror story of exploding aperture blades. It shouldn't be a terrifically expensive fix, the lens will feel wonderful after it's done, and you won't put yourself in line for an even more expensive repair which is sure to follow later.

    I had the same thing done (mine was only a bit stiff, apparently owing to a slightly bent acuator mechanism), and I'm very glad I did.
     
  5. IloveTLRs

    IloveTLRs Member

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    Aperture blades can break? I've never seen that before ...
     
  6. Worker 11811

    Worker 11811 Member

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    If the blades become misaligned they can cut into each other.

    If they become jammed the pivots can break loose or the actuator pins can break off.

    If you're lucky they'll only pop out of their sockets, in which case, is only a disassembly, clean and repair job but even if they can be reassembled, there could be minute damage that will cause them to break or jam again... Usually at the worst possible moment.
     
  7. cosmonaut1959

    cosmonaut1959 Member

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    I just fixed mine with this very same problem. Warning fix at your own risk!!!!!!!
    But the front element just screws off. Once off take a q tip a but a small amount of lighter fluid on the tracks that the apeture ring travels on and then just work the apeture and the lighter fluid will clean the tracks. There is a ring that will have to line back up it fits in a groove. Put it back together with the lens wide open is easier. You can do this without ever touching the blades. Go to justinlowe.com and search for Summitar repair. Your lens is built just like the Summitar.
     
    Last edited by a moderator: Sep 1, 2011