Circular Polarizing Filter
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.
Neutral Density Filter
Neutral Density filters have several uses and offer the possibility to achieve otherwise unachievable results. They enable the shooter to adjust exposure without affecting color balance. ND filters appear gray and reduce the amount of light reaching the film. Determining which neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters.
Graduated Neutral Density Filter
This filter enables the shooter to adjust exposure without affecting color balance. Neutral density filters are available in 1, 2, 3, or 4 stops to suit individual situations.
Often it is necessary or desirable to balance the light intensity in one part of a scene with another. This is especially true in situations where you don't have total light control, as in bright contrasty landscapes. Exposing for the foreground will produce a washed-out, over-exposed sky while exposing for the sky will leave the foreground dark and under-exposed. This filter enables cloud detail to be kept correctly exposed in the picture.
Determining which graduated neutral density filter yields ideal results for any given lighting situation takes knowledge, experience and a collection of such filters. Choose the filter strength which adjusts the lighting to stay within the exposure latitude (greatest difference between bright/dark values) which still shows details in both of the digital or film medium in use.
Combined with the rotating and positioning filter trays in the microMatteBox, the graduation can be rotated and moved to match the horizon line.
Porta Brace Filter Case
This accordion style case holds 4 x 6" filters in five padded compartments. There's even a front accessory pocket for holding cleaning tissue and a small bottle of cleaner. There's a handy window on top that allows you to see the contents. It comes with a nifty belt loop for ease of portability. The case measures 2.75 x 6.0 x 8.0" (7.0 x 15.2 x 20.3 cm) and weighs a mere 1 lb (453 g).