E-PM1 rattle

Discussion in 'Olympus Cameras' started by AdamThirtle, Feb 18, 2012.

  1. AdamThirtle

    AdamThirtle Mu-43 Veteran

    Jun 10, 2011
    Newcastle, UK
    Hello, yesterday I noticed with my panny 20mm and oly 45mm the aperture opening and closing like they would on older models. I shoot in aperture priority and never noticed this before. I know it was never a real problem, but i was wondering if anyone else experiences this, or have I just not been paying attention until yesterday?

    Thanks, Adam
  2. Aegon

    Aegon Mu-43 Veteran

    Nov 3, 2011
    Portland, OR
    This happens most often with fast lenses in brighter light, particularly the PL25/1.4. Many people call this the "rattlesnake".

    Panasonic bodies don't have as much of a problem.

    The latest round of firmware updates haven't fixed the problem.

    As far as I understand, bright lenses can overwhelm liveview with light, so the body stops down, whereupon the body decides it could use some more light, so the body opens up, and so on.

    What Oly needs is to program a little hysteresis into their algorithm. But for some reason, they haven't yet.

    Various workarounds have been posted, including locking exposure and using other modes. Searching for rattlesnake will give you more data.
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