New Hoya 77mm Digital Circular Polarizer CPL-PL 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 is often used to increase the contrast and saruration in blue skirs and white clouds . A Circular Polarizing filters do not affect the overall color balance of a shot.
　

Eliminates reflections from nonmetallic surfaces such as water , glass, etc. Also increases contrast and colour saturation. Recommended for TTL & AF cameras and video camcorders.

This is brand new, and sealed in original box.

Note: Above picture is just for reference.

 CIR-PL (Circular Polarising) filters have the same effect, but it is important that you choose the correct version for your camera. They allow you to remove unwanted reflections from non-metallic surfaces such as water, glass etc. They also enable 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. HOYA's polarising filters do not affect the overall color balance of a shot.

How to select the correct Polarizing filter:
Many of today's cameras use semi-silvered mirrors or prisms to split the light entering the viewfinder in order to calculate exposure and focusing distance. PL (Linear Polarising) filters can sometimes interact with these items to give unpredictable exposure or focusing. So we recommend that you choose a PL-CIR filter unless you have a manual focus camera which has no beam splitter.