Allows a telephoto lens function as a macro lens Compatible with a zoom or prime lenses in the focal length range of 35 - 250mm (full frame equivalent) Best working distance: 9-22cm Mounts on any lens with a 58mm thread Includes 49mm and 52mm adapters Double optical corrective glass Apochromatic Design Muti-nano Coating Available for lenses with 58mm filter Thread -Diopters +5