Patent ID: 7430079
Filing Date: 2008-09-30
Classification: G02B

Abstract:
1. A zoom lens comprising, in order from its object, a first lens group of positive refracting power, a second lens group of negative refracting power, a third lens group of positive refracting power and a fourth lens group of positive refracting power, characterized in that upon zooming from a wide-angle end to a telephoto end of the zoom lens, said first lens group, said second lens group, said third lens group and said fourth lens group each move such that an air spacing between said first lens group and said second lens group grows wide, an air spacing between said second lens group and said third lens group becomes narrow, and an air spacing between said third lens group and said fourth lens group grows wide, and said zoom lens satisfies the following conditions (1) and (2): where Mg w2 is a transverse magnification of the second lens group at the wide-angle end, f f