The DG UV filters benefit from a super multi-layer lens coating developed to counteract the highly reflective characteristics of digital image sensors reducing both flare and ghosting. Black rimmed glass eliminates unnecessary internal reflections. The Sigma EX DG range comprises UV filters, which not only reduce ultraviolet light but are ideal for protecting the lens during general photography. more info

The Original Post is Located Here: Sigma AFL940 46mm EX DG UV MultiCoated Filter