Setting OIS with legacy lens?

Discussion in 'Adapted Lenses' started by larryc, Jun 14, 2014.

  1. larryc

    larryc New to Mu-43

    Jun 14, 2014
    New to the MFT world and enjoying it!
    I purchased an adapter to use some old MD lenses (50mm and 135mm) with my E-PM2. I've read that in order to use the optical image stabilization, I should manually set the lens length. But do I set it to the lens length, e.g, 50mm, or do I need to take into account the additional focal length added by the MD to MFT adapter?

    photo of my 135mm Ronkinon taken with my Minolta 50mm f2:
  2. verbatimium

    verbatimium Mu-43 Veteran

    Jul 17, 2013
    Toronto, Ontario
    Unless you have a more expensive MD to MFT focal reducer adapter that has glass in it, any standard inexpensive adapter without any glass with not change the focal length of the lens. So a 50mm lens is always a 50mm lens no matter what size sensor you use it on, so you will need to set your image stabilization for a 50mm lens. You do not need to consider the crop factor of the sensor.

    If your adapter is indeed a focal reducer (the adapter will have glass in it), you will need to do the calculation of what focal length your lens becomes with those adapters.
  3. larryc

    larryc New to Mu-43

    Jun 14, 2014
    Thanks, that makes sense. My adapter is just an inexpensive adapter, no glass.