The filter is made of high quality optical glass.
-The rings are made of metal.
-Rotating Frame female thread on top to allow use with other filters or hoods .
What is a CPL filter for?
-Light rays which are reflected by any surface become polarised and polarising filters are used to select which light rays enter your camara lens.
Remove unwanted reflections from non-metallic surfaces such as water, glass etc.
-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.-Do not affect the overall color balance of a shot.>