| 摘要 |
A variable magnification optical system ZL has, in order from the object side, a first lens unit G1 with a positive refractive power, a second lens unit G2 with a negative refractive power, a third lens unit G3 with a positive refractive power, a fourth lens unit G4, and a fifth lens unit G5 with a positive refractive power, and is configured to satisfy conditions of the following expressions: 2.49<|f4|/f5<4.69; and where f4 is a focal length of the fourth lens unit, f5 is a focal length of the fifth lens unit, and &bgr;5w is a lateral magnification of the fifth lens unit in the wide-angle end state.
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