| 摘要 |
A zoom lens comprising, in order from an object side to an image side, a first lens (L1) unit having a negative refractive power, a second lens unit (L2) having a positive refractive power, and a third lens unit (L3) having a positive refractive power. The second and third lens units are configured to move in an optical axis direction for a magnification variation, and the first lens unit is configured to move in the optical axis direction to reduce an image-plane fluctuation associated with the magnification variation. Expressions -0.83‰¤f1/f2‰¤0.40 and - 4.6‰¤f1/fw‰¤-2.5 are satisfied where f1 is a focal length of the first lens unit, f2 is a focal length of the second lens unit, and fw is a focal length of the entire zoom lens at a wide angle end. |
