Polarizer filters give you several key creative features. They evenly increase color saturation of all colors (except black and white), creating deep, rich scenics.They add contrast for dramatic skies and arial shots.They eliminate the whitish glare from highly reflected surfaces like glass and water.Polarizers are two part lenses that rotate, allowing you to select the degree of additional saturation, contrast and glare reduction desired.Circular -- for all types of cameras: required for beam splitting metering systems commonly found in auto-focus SLR's and in most current TTL SLR's.Polarizers are most useful for increasing general outdoor color saturation and contrast. Polarizers can darken a blue sky, a key application, on color as well as on black-and-white film, but there are several factors to remember when doing this. To deepen a blue sky, it must be blue to start with, not white or hazy. Polarization is also angle-dependent. A blue sky will not be equally affected in all directions. The areas of deepest blue are determined by the following "rule of thumb." When setting up an exterior shot, make a right angle between thumb and forefinger. Point your forefinger at the sun. The area of deepest blue will be the band outlined by your thumb as it rotates around the pointing axis of your forefinger, directing the thumb from horizon to horizon. Generally, as you aim your camera either more into or away from the sun, the effect

• Creates dramatic sky/cloud contrast.
• Saturates colors without changing color balance.
• Mount rotates to control amount of effect.
• Increases contrast equally well with black & white film.