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A related question, I know that for darkening skies, there is a limited angle over which the CP is effective, and this angle also relates to the position of the sun.
However, for the other uses (reducing glare off foliage/rocks/water/etc) does the same limitation apply? Or can you get enhancing effects even when you are pointed right at the sun or right away from the sun?
I'm pretty sure, given my understanding of the physics, that the position of the sun does not matter in the second case, but I am curious if anyone is sure.
To answer your question Ben, I use my CP on ultrawide lenses. Again it does come down to the composition and the subject. If there is a big swath of clear sky then I may not use the CP, but I find often times that either due to the environmental conditions (such as cloud cover) or compositional considerations (presence of mountains, etc) much of the sky is blocked out and using the CP is fine. Also, personally I am usually not that bothered by an uneven sky in a photo- after all the brightness of the sky may still not be uniform with a wide FOV even if you took the CP off, since the closer towards the sun you point, the brighter the sky gets.