Wide angle lens system has negative first, and positive second, lens groups, front and rear positive sub-lens groups, and two focusing lens groups.

摘要

The negative first lens group (10) and a positive second lens (20) group are positioned in this order as seen from the object. The positive second lens group has a positive front and a positive back sub lens group positioned in sequence from the object. A first focusing lens group contains the first lens group and the positive front sub-lens group. A second lens group contains the positive back lens group. The distance between the two focusing lens groups diminishes from the image side to the object side.