Allows close-up shooting, as the minimum object distance can be shortened. Chromatic aberration on periphery is also reduced by using multiple lenses.* When using with wide-angle lens or full size DSLR, vignetting may happen. You may miss the point when you come closer to a flower or other small object to take a picture of it. Haven't you had such an experience? At such times, "Close-up lens" mounted on the lens will enable close-up shooting. The close-up lens mounted on the lens will shorten the minimum focus distance, enabling you to, in effect, come closer to an object for close-up photography. Unlike a zoom lens with a macro, it can be used in the entire zoom area. You can take a picture at any magnification by zooming even at the same distance from the object.