Wide-angle lens system with movable lens for correcting short distance photographic faculty arranged near diaphragm

摘要

A wide-angle lens system with a movable lens for correcting the short distance photographic faculty arranged near a diaphragm, which comprises a front lens group F and a rear lens group R separated by a diaphragm space, said rear group R comprising a movable lens in the form of a positive or negative singlet or a lens having a simple construction, said movable lens being arranged near the diaphragm and adapted to be moved in response to the change of its distance from an object toward the diaphragm when it is the positive lens and away from the diaphragm when it is the negative lens, and defined by the condition 0.6 ¦fm/f¦ 3.