| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact variable magnification optical system and an optical device which exhibit a high variable magnification ratio, and good optical performances, and to provide a manufacturing method for the variable magnification optical system.SOLUTION: A variable magnification optical system comprises a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, an aperture stop S, a third lens group G3 having a positive refractive power, and a rear lens group GR in this order from the object side. When magnification from a wide angle-end state to a telephoto end state, at least the rear lens group GR moves toward the object side and a distance between the first lens group G1 and the second lens group G2, a distance between the second lens group G2 and the third lens group G3, and a distance between the third lens group G3 and the rear lens group GR are changed. The entire third lens group G3 moves along an optical axis when shifting a focus from an object at infinity to an object at a short distance. At least some lenses of the rear lens group GR function as an anti-vibration lens group by moving in a direction having a component perpendicular to the optical axis. The anti-vibration lens group has a negative refractive power. |
