Patent ID: 6785056
Filing Date: 2004-08-31
Classification: G02B

Abstract:
An electronic picture taking apparatus comprising a zoom lens system and an electronic image pickup device;said zoom lens system comprising a first negative lens unit, a second positive lens unit, a third positive lens unit, and a fourth positive lens unit in order from an object side, a space between said second lens unit and third lens unit increasing during a zooming operation from a wide angle end to a telephoto end while focused on an infinite object; focusing on the object nearer the zoom lens system being performed by moving said third lens unit toward the object side; said fourth lens unit consisting of a single positive lens element having an aspherical surface; and said zoom lens system satisfying the condition âˆ’1.2<exPW/exPT<0 wherein exPW and exPT designate a distance from an image plane to an exit pupil of said zoom lens system at the wide angle end and the telephoto end, respectively when said zoom lens system is focused on an infinite object.