Constructed with multi-coated optical glass, high transmittance, water-proof, oil-proof, providing you clear, high-resolution images with minimal distortion and for glare. It can conveniently attached to the front of lens and allows you a wider of view, taking wide-angle photography. Housing frame part is magnesium-aluminum alloy, machining， which has high strength, good toughness, and durability. 2 .2X times magnification, which can the detail of objects, great for close-up Suitable for cameras &