Light rays which are reflected become polarized. Polarizing filters are used to select which light rays enter your camera lens. They can remove unwanted reflections from non-metallic surfaces such as water or glass and also saturate colors providing better contrast. The effect can be seen through the viewfinder and changed by rotating the filter. The filter factor varies according to how the filter is rotated and its orientation to the sun. Filter factor is between 2.3 and 2.8 (approx. +1.3 stops).
This unique filter combines the advantages of a polarizer with the warming effect of an 81A filter.
Circular polarizers are specifically designed for use with auto-focus SLR cameras (They will also work on manual systems without problems).
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Comments about B+W 77mm Warm Circular Polarizer 81A Glass Filter:
Allows more light in and is perfect to soften those harsh, bright light conditions...
It really makes colors more vivid in my outdoor landscapes, etc
Pros
Cons
Best Uses
Comments about B+W 77mm Warm Circular Polarizer 81A Glass Filter:
I bought a Polarizer without the 81A Warming filter and some of the pictures appeared dull. The Polarizer 81A Warming filter restored the full color that my camera(Canon T1i)takes with the additional benefits of the polarizer. Be aware that if you intend to keep the filter on, you will need a push-on lens cap, as the snap-on lens covers do not work for this filter.
B+W use a higher quality glass than the cut glass of some other brands.
I'm going hiking this weekend, and I can't wait to use it!
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