High Transparency Film This Filter uses a newly developed high transparency film that passes more visible light the filter while still filtering the same amount of polarized light. UV Absorbing The glass of the Clear PRO filter also has UV absorbing properties making the Clear PRO a combination CPL and UV filter. Superior Color & Contrast Enhancement CPL filters allow you to remove unwanted reflection from non-metalic surfaces such as water, glass etc. They alsoenable colors to become more saturated and appear clearer with better contrast. This effect is often used to increase the contrast and saturation in blue skies and white clouds. Kenko's CPL filter do not affect the overall color balance of a shot. High-Rate Transparency Film This filter uses a newly developed High-Rate Transparency film that passes more visible light through the filter while still filtering the same amount of polarized light. The Kenko Clear PRO circular polarizer filter transmits as much as 25% more light through the polarizing film giving the photographer about 1/3 stop more light than a standard circular polarizer. This new polarizing film is also used in the latest HD LCD TVs. UV Absorbing The glass of the Kenko Clear PRO CPL + UV Absorbing filter also has UV absorbing properties making the Clear PRO a combination UV/circular polarizing filter. The most common use for a circular polarizer filter is to darken bright blue skies in outdoor photography, but they also can reduce or eliminate reflections from non-metallic surfaces such as glass and water. By rotating the outer ring of the filter the change of effect can be seen by looking though the filter or through the viewfinder if it is mounted on a camera.