h better contrast and improved color saturation, such as with blue skies and white cloudsFilters also provide protection from the lens and are ideal for digital and traditional 55mm camerasND2: Reduce one gear of the aperture, average transmittance of 50%ND4: Reduce two gear of the aperture, average transmittance of 25%ND8: Reduce three gear of the aperture, average transmittance of 12.5%External