| 主权项 |
1. A telephoto lens system comprising:
a first lens group having a positive refractive power; a second lens group having a negative refractive power; and a third lens group comprising a (3-1)-th lens group having a positive refractive power, a (3-2)-th lens group having a negative refractive power, and a (3-3)-th lens group having a positive refractive power, wherein all lenses included in the first lens group satisfy the following equation 1, and the third lens group satisfies the following equation 2:14·D1R1-D2R2≥0.06,(1)6≤f3·(1f3-1+1f3-2+1f3-3),(2) where for each lens included in the first lens group, D1 is an effective diameter of a lens surface directed toward an object side, R1 is a radius of curvature of the lens surface directed toward the object side, D2 is an effective diameter of a lens surface directed toward an image side, and R2 is a radius of curvature of the lens surface directed toward the image side, and where f3 is a focal length of the third lens group, f3-1 is a focal length of the (3-1)-th lens group, f3-2 is a focal length of the (3-2)-th lens group, and f3-3 is a focal length of the (3-3)-th lens group. |
