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    Re: Which diameter of the sun in digital photos ?
    From: Bill B
    Date: 2009 Aug 21, 18:33 -0400

    > From: Marcel Tschudin 
    > 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'.
    Cokin, and I am sure others, make filter frames in which a square filter
    will slide, and graduated filters.  Or just use a dense filter and slide it
    in the filter mount to reduce the sun without affecting the horizon.
    Bill B.
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