4 filters-in-one reducing multiple surfaces and potential reflection from stacked filters Removes unwanted reflections ideal for shooting in beauty in hot / warm environments Saturates colors providing better contrast without affecting the overall color balance Eliminates ultraviolet rays to remove haze from outdoor shots Maintains the distinct subtle effect of Glimmerglass½ Designed for digital cameras with CMOS & CCD sensors with heightened response tothe Red channel Absorbs pollution in the Far Red (visible), Near Infrared and Far Red wavelengths IR absorbing component is proportionate to the ND value Available in ND densities 0.3, 0.6, 0.9; each density available as GG 1/2, 1, 2 Ideal for lightweight 2 stage and clip-on matte boxes with rotating stage Made from water white glass