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12-40mm nodal point

Discussion in 'Native Lenses' started by walter_j, Aug 2, 2016.

  1. walter_j

    walter_j Mu-43 Veteran

    364
    Sep 10, 2013
    Hagwilget, B.C., Canada
    Walter
    Does the 12-40mm nodal point change when focal length changes? Where is the nodal point on this lens?
     
  2. Carbonman

    Carbonman Mu-43 All-Pro

    Jul 10, 2014
    Vancouver BC
    Graham
    Walter, I've never considered it, but would expect it to shift according to the focal length. Isn't the location of one of the nodes what defines the focal length? I'm not sure what the other node defines except maybe what's in focus at the sensor plane.
     
  3. christofp

    christofp Mu-43 Regular

    138
    Jul 21, 2012
    1) Yes.

    2) It depends on the focal length.

    At 12mm, it is some mm behind the front lens. I have marked the nodal point at 12mm on my macro slide.

    For other focal length (which I don't use often for panos) I have to determine the nodal point on the fly. It is easier than you might think, you need two subjects (one ver near, one very far) and you check wether the near object moves against the far subject when panning the camera. Enabling LCD magnification helps ...

    Christof
     
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