| 摘要 |
A zoom lens is described. The zoom lens includes, in an order from an object side: a first lens group that comprises at least two negative lenses and a single positive lens, the first lens group having a negative refractive power; a second lens group that comprises a plurality of lenses, at least one correction lens of the second lens group being movable in a surface that crosses an optical axis to perform image-shaking correction, the second lens group having a positive refractive power; a third lens group that comprises a single negative lens, the third lens group having a negative refractive power; and a fourth lens group having a positive refractive power. |
| 主权项 |
1. A zoom lens comprising, in an order from an object side:
a first lens group that comprises at least two negative lenses and a single positive lens, the first lens group having a negative refractive power; a second lens group that comprises a plurality of lenses, at least one correction lens of the second lens group being movable in a surface that crosses an optical axis to perform image-shaking correction, the second lens group having a positive refractive power; a third lens group that comprises a single negative lens, the third lens group having a negative refractive power; and a fourth lens group having a positive refractive power, wherein intervals between the first, second, third, and fourth lens groups are changed during zooming from a wide angle position to a telephoto position, and the zoom lens satisfies the following conditions:
0.05<M4/M2<1.0, and0.8<f4/ft<5.0, where M2 denotes an amount of movement of the second lens group in a direction toward the optical axis during zooming from the wide angle position to the telephoto position, M4 denotes an amount of movement of the fourth lens group in a direction toward the optical axis during zooming from the wide angle position to the telephoto position, f4 denotes a synthesis focal length of the fourth lens group, and ft denotes an overall focal length in the telephoto position. |
