• Variable ND Filter: The K&F CONCEPT ND2-400 filter reduces the light from 1 to 9 stops
• Material: Made from complete professional optical glasses with a double-sided, multi-layer blue coating to help make them waterproof
• Reduced Exposure: ND filters are suitable for rivers, waterfalls, and other bodies of water, especially in bright light. The longer exposure time allows for smoother water movement, shallower depth of field, and blurred motion
• Ultra-Thin: The filter frame is only 7.3mm and the ultra-light CNC ring used in construction prevents undesirable effects

Note: This filter kit is compatible with all 37mm lenses. Please verify the lens thread size of your camera before ordering. Your camera's lens thread size will be marked somewhere on the barrel or printed on the underside of the lens cover.