Sunpak¿s Circular Polarized Filter increases color saturation and contrast by reducing reflections from non-metallic surfaces and by cutting through haze, Deepens sky color and generally requires through-the-lens viewing. Sunpak is one of the world's largest manufacturers of electronic flash equipment. It has earned a reputation for advanced technical achievement and superior quality. Sunpak electronic flashes are produced for professionals, advanced amateurs, enthusiasts, and casual photographers. They are designed to work with today's auto focus cameras having dedicated flash capabilities. All Sunpak flash units offer advanced features, which provide the widest range of creative control. They are supported by a wide spectrum of system accessories, such as dedicated modules, filters, adapters, batteries and more.