| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact variable magnification optical system and an optical device which exhibit superior 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, and a rear lens group GR having a positive refractive power in this order from the object side, is configured such that a distance between the first lens group G1 and the second lens group G2 and a distance between the second lens group G2 and the rear lens group GR are changed when magnification from a wide-angle end state to a telephoto end state, and the optical system includes at least one lens which fulfills prescribed formulae. |
