SLR Magic's uniquely designed variable neutral density filter provides the equivalent brightness range from 21/3 to 6(0.4 to 1.8) f-stop reduction with full practical range. Color shift and cross-like vignette effect commonly found on variable ND filters are avoided through use of special glass and treatment.
The versatility of the SLR Magic variable ND filter replaces the need for a set of ND filters and also prevents vignette that may occur when multiple ND filters are used. Digital multi-coating is used to reduce lens flares and ghosting effect caused by reflections. Calibrated markings on filter allow for repeatable positions.