Hoya 77mm Variable Density Screw in Filter

Rotating filter ring with scale indicating max. through min. settings Provides 1.5 - 9 stop exposure reduction, equal to filter factor NDX3 - NDX400 Enables slow shutter speeds to be used; Ring Material: Aluminum Allows greater control over depth of field Does not affect colour balance or detail. The precision built in double ring design allows the outer ring rotates to control amount of neutral density effect