| 摘要 |
A zoom lens ZL, which is mounted on an electronic still camera 1 or the like, is composed of, in order from the object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, a third lens unit G3 having a positive refractive power, a fourth lens unit G4 having a negative refractive power, and a fifth lens unit G5 having a positive refractive power. The first lens unit G1 has, in order from the object side, a negative meniscus lens with a convex surface on the object side, and a positive lens, and the second lens unit G2 has, in order from the object side, a negative meniscus lens with a convex surface on the object side, a biconcave lens, and a positive lens. The zoom lens satisfies a condition of the following expression: 0.005<(−f2)×f3/(f12)<0.023, where f1, f2, and f3 are the respective focal lengths of the first, second, and third lens units G1, G2, and G3.
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