These filters have a new design that suits the high optical performance
of all new Global Vision products to prevent vignetting or the decrease
in peripheral light quantities especially when the thinner wide type
filters are used with Sigma lenses. By incorporating Sigma?s Super
Multi-Layer Coating, the filter reduces flare and hosting; black rimmed
glass eliminates unnecessary internal reflections, and provides high
performance for both digital cameras and film cameras.
In addition, to ensure versatility, Sigma?s WR filters feature excellent
water and oil repellent as well as an antistatic function, and the two
types of ?Protector? can protect the lens surface effectively.
Circular PL filter removes the reflection of water surface and glass
windows, and increases the contrast in landscape photography.