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    Re: Saturn Lunar by DSLR Camera
    From: Greg Rudzinski
    Date: 2017 Sep 30, 10:59 -0700


    Start with a telephoto 150 mm or larger vintage lens that is non-zooming and has the focus taped at infinite focus (adaptor needed to attach to DSLR camera). Field of view will be around 8°.  This means CN is restricted to sunrise and sunset images and very low altitude Moon and planets. There is a learning curve to the best settings and lightroon 5 developing. A quick initial calibration can be done by imaging a 4° distant horizontal angle at infinite focus then compare to a metal sextant reading of the same horizontal angle.  Work up the minutes of arc per pixel and then test on a filtered sunset capture with a visible natural horizon. Dip will need to be applied to the camera angle Hs to get a working Ho for sight reduction. Calibrating wider angle lens is much more difficult and will test the photogragher/navigator's patience. Lots in the archives on this.

    Greg Rudzinski

    From: Andrés Ruiz
    Date: 2017 Sep 30, 12:09 +0200

    Thanks for the information Greg,
    very interesting, indeed.
    I will dive in all the post about this issue in NavList, my interest is growing with your good results.
    And, with other lens, how is your calibration process?
    I tried some sights by camera, but my results was very poor, I suppose because the calibration was not good enough!

    Andrés Ruiz
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