Housing frame part is magnesium-aluminum alloy, which has high strength, good toughness, hard and wear-resistant, corrosion-resistant, pollution-resistant. It can conveniently attached to the front of lens and allows you a wider of view, taking wide-angle photography. Wide application, macro lens is for microcosmic such as jewelry, circuit board, for butterfly, flowers, files, stamps, antiques, parts, Constructed with multi-coated optical glass, scratch-resistant, water-proof, oil-proof, providing you clear, high-resolution images with minimal distortion and for glare. 0.45X wide-angle lens with macro portion, for cameras & camcorders with 55mm size lens filter thread.