Patent ID: 8503099

Claim:
A zoom lens system consisting of, in order from an object along an optical axis: a first lens group having positive refractive power and an optical path bending element; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power; upon varying a focal length from a wide-angle end state to a telephoto end state, the first lens group being fixed with respect to an image plane, a distance between the first lens group and the second lens group increasing, a distance between the second lens group and third lens group decreasing, and a distance between the third lens group and the fourth lens group decreasing, the first lens group including at least one negative lens, and the following conditional expression being satisfied: 1.900 <nd 1 where nd 1 denotes a refractive index of the negative lens at d-line (wavelength λ=587.6 nm), wherein at least one of the third lens group and the fourth lens group consists of, in order from the object along the optical axis, a positive lens having a convex surface facing the object, and a cemented negative lens constructed by a positive lens having a convex surface facing the object cemented with a negative lens having a concave surface facing the image.