Aluminum Alloy Frame. Control the amount of light in your image so you can create longer exposures with this 72mm Okko Pro ND6 Filter. Shoot in bright light without overexposing your images. Use slower shutter speeds to create dramatic effects that emphasize movement. Master the long exposure with this 6-stop reduction filter. Videographers use the Pro ND in bright conditions for more consistent even light and color. Minimize time spent in post-production by taking better content in camera.