Hoya Y3VD055 55mm Variable Density FilterControl Your Exposure with Hoya 55mm Variable Density Filter The Hoya 55mm Variable Density Screw in Filter allows you to easily adjust the brightness of a scene, giving you greater control over your camera's exposure settings. Ideal for both still photography and video, this filter provides 1. 5 9 stop exposure reduction without affecting color balance. Specifications: Size: 55mm Exposure Reduction: 1. 5 9 stops (NDX3 NDX400) Frame Material: Aluminum