The Manfrotto Advanced Circular Polarising filter 77mm improves the overall image quality in a couple of ways. Firstly it increases colour 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 Advanced Circular Polarising filter ensures uniform light distribution; therefore maintain the sharpness and colour balance in images. The Advanced CPL filter is water repellent, scratch and oil resistant, includes 12 layers of coating and allows 68.1% light transmission.