Patent ID: 11914125
Assignee: NIKON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 17:
18. A zoom lens comprising, in order from an object, 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 negative refractive power, and a fifth lens group having positive refractive power,
respective distances between all adjacent lens groups being changed upon zooming from the wide-angle end state to the telephoto end state, and
the following conditional expressions being satisfied:

33.00<ft/(−f2)<46.00

43.00<β2t·β3t/(β2w·β3w)<65.00

where
ft denotes a focal length of the zoom lens in a telephoto end state,
f2 denotes a focal length of the second lens group,
β2t denotes magnification of the second lens group in the telephoto end state,
β3t denotes magnification of the third lens group in the telephoto end state,
β2w denotes magnification of the second lens group in a wide angle end state, and
β3w denotes magnification of the third lens group in the wide angle end state.