12.5mm c mount

Discussion in 'Adapted Lenses' started by manzoid, Aug 29, 2011.

  1. manzoid

    manzoid Mu-43 Regular

    Jun 9, 2011
    Hi all

    I recently bought a 12.5mm cosmicar c mount lens and it does not currently focus to infinity... This didn't surprise me.

    However when I screwed it in to the mount, I noticed the lens extends inside and if I file it, it will more so. Will it be safe to use after filing? (I mean not damage the shutter and/or camera.)

    Attached Files:

  2. Sammyboy

    Sammyboy m43 Pro

    Oct 26, 2010
    Steeler Country
    The register for m43 (distance from sensor to the lens flange) is 20mm. Measure the the distance from the flange to the extreme back of the lens. If it's less than 20mm you should be safe.
  3. Andrew H

    Andrew H New to Mu-43

    Jun 26, 2011
    Be very, very careful!

    While it is true that for micro four thirds the distance from the lens flange to the photosensitive surface of the sensor is 20mm, there are items in front of this, such as the anti-aliasing filter and, presumably, some form of shutter mechanism.

  4. RobWatson

    RobWatson Mu-43 Hall of Famer

    With the adapter mounted to the camera (no lens) measure the distance to the last baffle (the sutter is behind that baffle). You now can figure how much clearence there is behind the adapter.