For alpha DSLR lens diameter 49mm Suppresses unwanted reflections off glass and water Carl Zeiss T* Coating Minimizes reflections between filter and lens surface Suppresses flares and ghosts Slim design avoids vignetting .
For alpha DSLR lens diameter 49mm Suppresses unwanted reflections off glass and water Carl Zeiss T* Coating Minimizes reflections between filter and lens surface Suppresses flares and ghosts Slim design avoids vignetting