CPL‎:‎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 77mm 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.‎             Size‎:‎ 77mm Type‎:‎ CPL Filter   Package weight‎:‎ 0.106 kg Product size ‎(‎L x W x H‎)‎‎:‎ 7.9 x 7.9 x 0.8 cm / 3.10 x 3.10 x 0.31 inches Package size ‎(‎L x W x H‎)‎‎:‎ 9.6 x 9.6 x 1.7 cm / 3.77 x 3.77 x 0.67 inches Package contents‎:‎ 1 x 77mm CPL Filter Lens for Nikon Canon Sony DSLR Camera‎,‎ 1 x Plastic Case