Patent ID: 7907350
Filing Date: 2011-03-15
Classification: G02B

Abstract:
1. A zoom lens system comprising, in order from an object along an optical axis: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; a fourth lens group having positive refractive power; and a fifth lens group having negative refractive power, upon zooming from a wide-angle end state to a telephoto end state, the second lens group and the fourth lens group being moved along the optical axis, the first lens group including, in order from the object along the optical axis, a front lens group having negative refractive power, an optical-path-bending element for bending an optical path, and a rear lens group having positive refractive power, the third lens group including a plurality of lenses, and the following conditional expression being satisfied: where fw denotes a focal length of the zoom lens system in the wide-angle end state, ft denotes a focal length of the zoom lens system in the telephoto end state, and fn