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

Claim 2:
3. 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<MTF1/MTF2<3.00, where MTF1: an absolute value of an amount of movement of the first focusing lens group upon focusing from an infinity object to a short-distance object in a telephoto end state, and
MTF2: an absolute value of an amount of movement of the second focusing lens group upon focusing from the infinity object to the short-distance object in the telephoto end state.