Product Description SPECIFICATIONS Measures 2.9 inches in diameter and 2.4 inches long and weighs 11.6 ounces Built-in filter holder accommodates up to 3 gel filters at once Ultra-wide 180-degree angle of view for capturing entire scene 15mm fisheye lens with f/2.8 maximum aperture for Canon SLR cameras Minimum focusing distance of 8 inches for enhanced close-up shots 15mm fisheye lens with f/2.8 maximum aperture for Canon SLR cameras Ultra-wide 180-degree angle of view for capturing entire scene Minimum focusing distance of 8 inches for enhanced close-up shots Built-in filter holder accommodates up to 3 gel filters at once Measures 2.9 inches in diameter and 2.4 inches long; weighs 11.6 ounces