The Hoya Pro 1 Digital Series Circular Polarizing (PL) Filter allows you to remove unwanted reflections from non-metallic surfaces such as water and glass and they also improve color saturation clarity and contrast. This threaded filter is often used to increase the contrast and saturation in blue skies and white clouds for example. Hoyas polarizing filters do not affect the overall color balance of a shot and they will provide protection for your lens while shooting. Hoya Pro1 filters are optimized for use with digital SLR cameras but they are also perfect for traditional 35mm SLR applications. Key Features: DigitalMulti-Coated - These filters greatlyreduce lens flare and ghosting caused byreflectionsBlackAlmite Frame - A black matte aluminumsatin finish almite frame for reducing reflectionsBlackRimmed Glass - Black rimmed glass reduceslight reflection around the filter edgeLowProfile Frame - Ultra thin filter framesto help avoid vignetting on super wide anglelensesKnurlingEdge Frame - Equipped with a knurlingedge for easy attachment and removalUVProtected Case - Filter cases are UVprotected to further lengthen the life offilters