High Definition (Beveled Design) +10 Close-Up Lens, High-Index / Low-Dispersion 2 Element Optical Glass, Fully Multi-Coated & Threaded, Anti-Reflection Coating, High Speed Auto-Focus / Infrared Compatible, Optics close-up lenses are for quick and easy close-up photography. The close-up lens is screwed on to the front of a lens which has a 58mm filter thread. This lens has two achromatic elements to correct chromatic aberrations. They do not degrade the high optical performance resulting from your cameras natural lens.