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> 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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