Patent ID: 11899189
Assignee: NIKON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G  H

Claim 0:
1. A variable magnification optical system comprising, in order from an object side: 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, and a fifth lens group;
upon varying a magnification, distances between the neighboring respective lens groups being varied; and
the following conditional expressions being satisfied:

1.00<f3/(−f2)≤2.10

1.00<f1/(−f5)<2.50

where f3 denotes a focal length of the third lens group, f2 denotes a focal length of the second lens group, f1 denotes a focal length of the first lens group, and f5 denotes a focal length of the fifth lens group.