The Manfrotto Essential Circular Polarizing filter 52mm improves the overall image quality in a couple of ways. Firstly it increases color contrast and saturation, for instance increases the contrast of blue skies. Secondly, it reduces reflections that are often seen when photographing water, glass and similar reflective surfaces. Manfrotto Essential Circular Polarizing filter ensures uniform light distribution; therefore maintain the sharpness and color balance in images. The Essential CPL filter is water repellent, includes 2 layers of coating and allows 68% light Coating Each Manfrotto filter has been developed with the highest level of precision. The elaborate multi-coating process effectively minimizes reflections and maximizes the light transmission, hence delivering remarkable optical quality. The anti-reflectiveness of filters increases in parallel to the increase in the number of layers of coating. Additionally, as a result of the multi-coated layers, Manfrotto filters ensure a superior level of protection against dust, moisture and scratches. Technical Specifications: Antireflective Coating; Country Of Origin Japan; Diameter 2.05 in; Filter Type CPL; Light Transmission 68%; Number Of Coating Layers 2; Protective Case; Water Repellent; Weight 0.04 lbs.