Black Frost with Canon 7d test

“Black Frost Filters flare highlights, mute colors and tone down contrast while retaining rich blacks.” (Schneider Optics literature)

Polarizer example

“Reduce glare and unwanted reflections, Saturate colors, Deepen blue skies, Improve contrast, Penetrate haze” (Schneider Optics literature)

Nuetral Density (ND)

“Neutral Density filters have several uses and offer the possibility to achieve otherwise unachievable results. ND filters appear grey and reduce the amount of light reaching the film. They have no effect on color balance. They have four main uses: 1) To enable slow shutter speeds to be used, especially with high speed films, to record movement in subjects such as waterfalls, clouds, or cars. 2) To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. 3) To decrease the effective ISO of high speed film (above ISO 400) and allow it to be used outdoors in bright situations. 4) To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which could cause overexposure.” (Schneider Optics literature)