Patent ID: 11960065
Assignee: NIKON CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The zoom optical system according to claim 1, wherein
the succeeding lens group includes, in order from the object: a first focusing lens group that has a positive refractive power and moves upon focusing; and a second focusing lens group that has a positive refractive power and moves upon focusing, and
satisfies the following conditional expression:

0.20<|βTF1|/|βTF2|<5.00, where βTF1: a lateral magnification of the first focusing lens group in a case of focusing on an infinity object in a telephoto end state, and
βTF2: a lateral magnification of the second focusing lens group in a case of focusing on the infinity object in the telephoto end state.