High zoom-ratio zoom lens system for use in a compact camera

Abstract

A high zoom ratio zoom lens for a compact camera is disclosed which comprises in order from the object side, a first lens group having a positive focal length, a second lens group having a positive focal length, and a third lens group having a negative focal length. When zooming is carried out from a wide angle side to a telephoto side, the first, second and third lens group are all moved toward the object side so that a distance between the first and second lens groups is increased and a distance between the second and third lens groups is decreased. The zoom lens satisfying the following conditions: (A) the second lens group being composed, in order from the object side, of a sub-component 2a having a negative focal length and a sub-component 2b having a positive focal length, (B) a stop diaphragm being disposed between the first and second lens groups and being moved in unison with said second lens group during zooming, and (C) the stop diaphragm being separatable from the second lens group and being positionally fixed during focusing.

Dependencies are inferred from the claim text.