Zoom lens capable of macro photography

摘要

In a zoom lens a zoom operating ring is rotatable to vary the focal length of an optical system between a first focal length and a second focal length. A distance ring is rotatable to effect focusing of the optical system with respect to an object to be photographed which is positioned in a normal photographing distance range including infinity. A macro operating ring is rotatable to effect focusing of the optical system with respect to an object to be photographed which is positioned in a macro photographing distance range including an area of a shorter distance than a close distance in the normal photographing distance range. The optical system has a maximum magnification when the focal length is equal to the first focal length. In response to rotation of the macro operating ring, the zoom operating ring is rotated when the focal length of the optical system is equal to a given focal length different from the first focal length and the macro operating ring is in a position of rotation corresponding to a shortest distance within the macro photographing distance range conforming to the given focal length.