Exactly, XC. I was expecting a varying degree of darkening of the sky, depending on the angle between the lens and the sunrays. Still, I thought, overall darkening should be little more pronounced. But you've got me thinking because of this remark:
Quote:
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so when the sun is overhead, the entire horizon shows high polarization.
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I've been shooting between noon and about 3:00 PM. The sun, indeed, was high and that could have made the entire scene darker, hence lowered contrast and not much of sky darkening... Still, the question of higher than normal level of noise at ISO 100 remains unsolved.