| 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).
Linear polarizers are used with most
manual focus cameras and are not recommended for auto-focus cameras.
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