| 摘要 |
PROBLEM TO BE SOLVED: To provide a variable power optical system having sufficient optical performance, an optical apparatus having the variable power optical system, and a method for varying power of the variable power optical system. SOLUTION: This variable power optical system ZL to be mounted to a digital single-lens reflex camera 1 or the like comprises, sequentially from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a positive refractive power. The variable power optical system ZL is constituted such that when the lens position state varies from a wide angle end state to a telescopic end state, the distance between the first lens group G1 and the second lens group G2 increases, the distance between the second lens group G2 and the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 varies, and a part of the third lens group G3 moves in a direction perpendicular to the optical axis. COPYRIGHT: (C)2010,JPO&INPIT
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