Size Name:67mm Description: Neutral Density filter evenly reduce the amount of light passing thru the lens without effecting color. Ideal for reducing bright light in large aperture situations when a narrow depth is field is needed. Allows for slower shutter speeds when blurring or showing of movement is desired. Allows balancing of exposure to highlight a key subject. Lets you use higher speed films in bright light. Features: To enable slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas, etc. To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. To decrease the effective ISO of high speed film (ie: above ISO400) and allow it to be used outdoors in blight situations. To allow cine and video cameras (which have fixed shutter speeds) to film subjects such as snow, sand or other bright scenes which would normally cause over-exposure. Specifications: Thread: 67mm double thread Material: high quality SCHOTT optical glass Frame Thickness: 3mm Filter Density: ND3.0 (ND1000) FStop Reduction: 10 (approx) Package Includes: 1x 67mm ND1000 Neutral Density Filter 1x Moisture-Proof Shock-Resistance Protective box