Patent ID: 9684154
Date: 2017-06-20
CPC Classifications: G02B,Y10T

Claim:
1. A zooming optical system comprising, in order from an object side 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, and a fourth lens group having negative refractive power, and a fifth lens group having negative refractive power, and wherein upon zooming from a wide angle end state to a telephoto end state a distance between said first lens group and said second lens group, a distance between said second lens group and said third lens group, a distance between said third lens group and said fourth lens group, and a distance between said fourth lens group and said fifth lens group are respectively varied, wherein the following conditional expression is satisfied: where f5 denotes a focal length of the fifth lens group and fw denotes a focal length of the zooming optical system in the wide angle end state.