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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?

Marcel

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