ND filters (Neutral Density) reduce the amount of light reaching the film without affecting the color. Can be used to enable slower shutter speeds. Also can be used to better separate subjects from the background by allowing wider apertures, effectively decreasing depth of field. Great for portraiture and outdoor scenes. Features: ND (Neutral Density) Filters reduce the amount of light entering the film without affecting the color. Perfect for higher-quality, long exposure pictures. The addition of a lens hood can help prevent flares-those circles of light that can accompany images where a strong light source is just outside the frame. Professional tulip shape design (also known as "flower" or "petal" shape) allows for greater versatility. Perfect for standard or zoom lenses. Easy to use screw mount lens hood screws right onto your lens or filter. Specifications: Lens thread size: 52mm, 58mm (optional) Package size: 11 * 10 * 7cm / 4.3 * 3.9 * 2.8in Package weight: 76g / 2.7oz Package List: 3* ND Filter 1 * Lens Hood 1 * Filter Case