Marumi Digital High Grade filters have been specially designed with Digital Photography in mind. Each filter uses a specially developed ultra-low reflection coating to minimize internal reflection off the cameras built-in CCD & CMOS Sensors. Other anti-reflect features include a special slim frame with satin smooth finish & a black ink process on the glass edge to eliminate flare. The DHG Macro 3 shortens the focal distance of any lens & enhances its close-focus capability.