Sigma 77mm WR Ceramic Protector Filter
With over 10x the strength of a conventional protective filter, and 3x the strength of a chemically-hardened glass filter of the same thickness, the WR Ceramic Protector is as mighty as it gets.
The Sigma Professional Series represents the finest quality of filters available for your photographic lens, enhancing your overall experience with your camera and photography.
World’s first: Highly shock-resistant and scratch-resistant clear glass ceramic protective filter
10x the strength of a conventional protective filter and 3x the strength of a chemically hardened glass filter
Optically clear ceramic glass offers extremely high transmittance. Water-repellent (WR) coating reflects only 0.24% of visible light, thereby minimizing flare and ghosting.