| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a variable power optical system which achieves quick and silent AF without enlarging a lens barrel by reducing the size and weight of a lens group for focusing, and in which the variation in aberrations when varying power from a wide angle end state to a telephoto end state and when focusing from an infinite object to a short distance object is excellently suppressed, and to provide an optical device and a method for manufacturing the variable power optical system.SOLUTION: A variable power optical system ZL to be used in an optical device such as a camera 1, includes, in order 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; a fourth lens group G4 having a positive refractive power; and a rear lens group GR including at least one lens group. When varying power from a wide angle end state to a telephoto end state, the distances between the lens groups are changed. When focusing from infinity to a short distance object, the third lens group G3 moves along the optical axis.</p> |
