Patent ID: 8085477
Filing Date: 2011-12-27
Classification: G02B

Abstract:
1. A zoom lens system comprising in order from an object side: a first lens group having a negative refracting power; a second lens group having a positive refracting power; a third lens group having a positive refracting power, and a fourth lens group, wherein: the first lens group includes one cemented lens component, and the third lens group includes one lens component, and is movable for focusing, and the fourth lens group includes one lens component having an aspheric surface, and at the time of zooming from a wide angle end to a telephoto end, the second lens group moves while following a trajectory of movement only toward the object side, and the first lens group and the third lens group move while following a trajectory of movement different from the trajectory of movement of the second lens group, and the zoom lens system satisfies the following conditional expression (1) where, the zoom lens system satisfies the following conditional expression (2) where,