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    Re: Which diameter of the sun in digital photos ?
    From: Marcel Tschudin
    Date: 2009 Aug 21, 22:38 +0300

    Greg, thank you for your suggestions.
    For this exercise I'm using always the same camera having always the
    same lenses.The sun's diameter is measured in a photo-program after
    removing all colours except green and in some cases even removing all
    but blue. I fear to put an other hand-held filter in front since I
    have to measure the distance to the horizon which still must be
    visible, since the main purpose is to measure the sun's distance to
    the horizon. I have so many only faintly visible sun pictures
    confirming the obtained scale that I'm fairly confident that the value
    corresponds to what the camera 'sees'.
    Have you ever tried with the same lenses to compare the pixels per
    degree you obtained for the sun with those of landscape features?
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