Ideal lens protection made of optical glass, colour neutral. MC8 coating: four layers on each side, for high light transmission and maximum anti-reflection coating. Filter front and back are coated, so there is no loss of contrast and brilliance, ghost and double images are prevented. Ultra-thin wide-angle mount: prevents vignetting, can remain permanently on lens. Hardly extends the lens stem a protected front lens saves expensive repair costs. Quality class (glass): optical glass. Filter mount made of black anodized metal and blackened inner edges prevent reflections. Edge sealing protects against soiling. Dimensional stability of the mount despite temperature fluctuations.