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  1. #21
    Join Date
    Feb 2006
    Location
    Des Plaines, IL
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    9,560
    Well, if the aperture blades are sticky ... that would prevent movement. There is a spring that returns the aperture back to its tightest position. It also could be SPRUNG, so to speak. Usually you will see the aperture blades visibly widen when you put on the rear lens cap (provided it has the blade actuator in it).
    Last edited by DonSchap; 12-08-2009 at 04:27 PM.
    Don Schap - BFA, Digital Photography
    A Photographer Is Forever
    Look, I did not create the optical laws of the Universe ... I simply learned to deal with them.
    Remember: It is usually the GLASS, not the camera (except for moving to Full Frame), that gives you the most improvement in your photography.

    flickr & Sdi

  2. #22
    Join Date
    Dec 2009
    Posts
    8
    Quote Originally Posted by DonSchap View Post
    Well, if the aperture blades are sticky ... that would prevent movement. There is a spring that returns the aperture back to its tightest position. It also could be SPRUNG, so to speak. Usually you will see the aperture blades visibly widen when you put on the rear lens cap (provided it has the blade accutator in it.
    When I put on the rear lens cap and tighten it, the aperture blades goes visibly widen. But they stay that way, when I remove the lens cap, so there is no /is not enough force from the spring to return them back to smallest aperture.

    I hope its enough to clean the iris blades to get it functioning again. However,
    if the spring is damaged, where can I buy a new one?
    /garda from Sweden

  3. #23
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    Your picture shows the Aperture Lever in the open position. It would normally be in the closed position.
    Get one of your other lenses and move the lever to and fro to see how it feels against the resistance of the spring.
    The comparison between the two should give you a good idea of whether the spring is the problem or not.

  4. #24
    Join Date
    Dec 2009
    Posts
    8
    I have moved the lever back and forth on my other two lenses to compare with my minolta lens. It seems to be the spring on the minolta that is the problem.

    Where do you think I can find such spring?

    Is it the spring with number 2550-1420-01 that is seen on this url: http://www.pbase.com/pganzel/image/54100026 ?

  5. #25
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    That's the one. You need to see what's gone wrong with it.
    It's easy to get at on the back of the lens mount.
    Just watch out that the Drive Pin and ground spring (tiny) don't get lost.
    Last edited by Peekayoh; 12-12-2009 at 03:46 AM. Reason: typo

  6. #26
    Join Date
    Dec 2009
    Posts
    8
    Quote Originally Posted by Peekayoh View Post
    That's the one. You need to see what's gone wrong with it.
    It's easy to get at on the back of the lens mount.
    Just watch out that the Drive Pin and ground spring (tiny) don't get lost.
    Thank you for your information!

    I will borrow some tools from a friend. One thing to be clarified: To get to this spring and to remove the iris (blades to be cleaned), is it easiest that I open the lens just from one side?

    It seems easiest to open the lens from the back (the side towards the camera housing)?


    (I will follow this tutorial, by the way: http://www.pbase.com/pganzel/disasse...xxum_50mm_lens )

  7. #27
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    I'm afraid you may have to do both.
    Open the back first and fix the problem with the spring.
    If that solves it you're good to go. If not, the iris assembly comes out the front door.

  8. #28
    Join Date
    Dec 2009
    Posts
    8

    Wink

    I have opened the lens from the back. A tiny small spring was found loose. It is probably the ground spring, that was mentioned by Peekayoh further back in this thread. See pictures:
    Name:  small_spring2.jpg
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    On the second picture, the spring for minimizing the iris is fully functional (2550-1420-01), so I will open the lens from front-side to try cleaning the iris-blades. I think the loose spring has part number 2550-1424-01, as seen on this picture: http://www.pbase.com/pganzel/image/54100004 By inspection of that picture, I found where the ground spring shall be placed.

    Any feedback on the operation is welcomed.
    Last edited by garda; 12-14-2009 at 02:40 PM.

  9. #29
    Join Date
    Dec 2009
    Posts
    8
    I have successfully cleaned the irisblades and now the lens is fully functional!

    I lost the ground spring, but replaced with a bit of copper wire, as suggested in the comments of the tutorial I have previously linked to. Thanks to this thread and the tutorial, my lens is now working. Great.

  10. #30
    Join Date
    Nov 2008
    Location
    Monmouthshire, UK
    Posts
    2,152
    Well done, garda. Now post some pics.

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