| 主权项 |
1. A zoom lens comprising a front unit including one lens unit having a negative refractive power, and a rear unit including an aperture stop and one or more lens units and having a positive refractive power as a whole, in an order from an object side to an image side, an interval between adjacent lens units changes during zooming such that an interval between the front unit and the rear unit decreases at a telephoto end when compared to a wide angle end,
wherein the front unit includes a negative lens G11 in a position closest to the object side, and a lens surface of the negative lens G11 on the image side has an aspherical shape by which the positive refractive power increases from a center to an edge, and wherein, when a length in an optical axis direction from a surface vertex of a lens surface of the negative lens G11 on the object side to an edge of an effective aperture of the lens surface on the image side is t11, a radius of the effective aperture of the lens surface of the negative lens G11 on the object side is y111, a focal length of the negative lens G11 is f11, a focal length of the front unit is f1, a synthetic focal length of the rear unit at the wide angle end is f2w, and a focal length of a whole system at the wide angle end is fw, conditional expressions below are met:
0.36<t11/y111<0.47−2.0<f11/fw<−1.3−0.58<f1/f2w<−0.20 |
