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  1. #1

    Join Date
    Dec 2012
    Shooter
    35mm
    Posts
    59

    Olympus Zuiko OM 28mm 2.8 lens – slow aperture blades. Easy fix?

    I have an OM Zuiko 28mm f2.8, which has problems with the aperture blades. When I press the button on the side of the lens (depth of field button?) the blades seem to close slowly. They then stick for a bit, and then slowly open. My other Zuikos 'zip' closed and open instantly.

    Also, when adjusting the aperture dial, the blades seem to half close and then open on their own. The other Zuiko lenses I have, don't move at all when I adjust the aperture.

    I have a great repair person, but it would probably cost me as much to get him to fix this, as it would to buy a decent version online – it's not the most expensive lens in the world.

    So, despite the fact that I have never attempted a camera or lens repair myself... how hard would it be for me to open this lens up and fix this problem? Or am I asking for a world of pain?

    Thanks for any tips, step by step guides, encouragement… or otherwise.
    Last edited by Roundabout; 09-17-2013 at 06:53 AM. Click to view previous post history.

  2. #2

    Join Date
    Oct 2008
    Location
    Ottawa, Canada
    Shooter
    35mm RF
    Posts
    76
    Yeah, easy fix. The mechanism is spring tensioned, and the lever arm very likely has oil on it. If you search the web, you'll find that it is a very normal failure for the age of the lenses.

    To fix it yourself, take the screws off the rear mount. You'll see the mechanism and spring loading. Take the lever and spring off, clean it all up with lighter fluid (naptha) and put it back together. Some suggest leaving it dry; you can also use a tiny amount of shutter oil.

  3. #3

    Join Date
    Oct 2008
    Location
    Ottawa, Canada
    Shooter
    35mm RF
    Posts
    76

  4. #4

    Join Date
    Dec 2012
    Shooter
    35mm
    Posts
    59
    Thanks vysk. Much appreciated.

    I'll have a go at this when I'm more awake.

  5. #5

    Join Date
    Dec 2012
    Shooter
    35mm
    Posts
    59
    Hmmmmm. That YouTube video seems to be a bit wrong. There doesn't seem to be anything wrong with the lens.

  6. #6

    Join Date
    Oct 2014
    Shooter
    35mm
    Posts
    145
    Yes I agree, that video is about how to disassemble an otherwise perfect lense.

    I have just done however my fix for the same lense with the same sympthome.
    Takes 5 minutes to fix it. All we have to have a proper screwdriver.
    There are two black metal circular platforms when we take out the three screws and the one that fixes the back metal plate to the black back lens holder (4 screws! , the last one should not necesseraly to be taken fully out, otherwise there is a little game how to reinstate later that tiny little screw). When we have these twoes, there is an oil inbetween them, so little bit of alcohol (I had a tiny bit of palinka to be sucrifised for this purpose ) to clean it.
    Yes, there is a spring too, careful, not to loose that and not to forget to reinstate at the end.

    Cheers!

    Last edited by sagai; 05-15-2015 at 01:14 AM. Click to view previous post history. Reason: Image added

  7. #7

    Join Date
    Apr 2004
    Location
    Montgomery, Il/USA
    Shooter
    Multi Format
    Posts
    5,628
    Generally it's the easiest SLR lens to clean of slow blades.
    Once in a blue moon you may find one with oil in the blade housing. Few and Far between though.

    Just pay attention to how the rings are assembled. There's only one right way.
    Expletive Deleted!

  8. #8

    Join Date
    Oct 2014
    Shooter
    35mm
    Posts
    145
    I think it is about slow reaction to DOF due to oil between these circles.
    Blades are however could be more complicated to be cleaned.
    http://olympus.dementix.org/Hardware/PDFs/28mm_f2.8.pdf



 

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