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    Re: Calibrating a Camera-Lens-unit for measuring angles
    From: Bill B
    Date: 2012 Sep 09, 15:20 -0400

    On 9/9/2012 10:39 AM, Marcel Tschudin wrote:
    > Since we noticed that the subject appeared at that time not to be of
    > much interest for NavList members we continued with it off-list.
    Thank you Greg and Marcel for generously sharing your methods.
    The interest was there for me, but time constraints due to family
    matters and lack of a sophisticated DSLR demanded directed "play" be
    placed on the back burner.
    As a (former) semi-professional photographer it occurred to me given the
    quirks of various lenses (including pin cushion and barrel distortion)
    the calibration task was non trivial. (Oh for a legendary Hasselblad SWC
    with the 38mm Biogon and a digital back--yum yum.)
    As a side bar, my Nikon D7000 has programs to remove distortion from
    some lenses. Doesn't that introduce an interesting wrinkle!
    Currently I am reading and re-reading you recent posts. Hopefully I will
    be able to do some trial runs to get the technique down, then head up to
    Lake Michigan for some field trials.
    Bill B

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