B007RLWORM Hoya 77mm Variable Density Screw-in Filter

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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