Color and contrast enhancement:
Light rays which are reflected by any surface can become polarised so polarising filters are used to select which light rays enter your camera lens. CPL allows 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.

Features:
Slim Circular Polarizing Filter， no dark corners of images
Removes unwanted reflections from non-metallic surfaces such as water or glass and glare from the sun
Increases color saturation， creating deep， rich scenic images
Helps to reduce the amount of light entering the lens
Especially useful in reflective or stray light
40.5mm diameter， fits for all the same size of screw lens
Suitable for all the same size camera lens' diameter， like Canon， Nikon， Sony， Pentax etc.