| 摘要 |
A zoom lens including, in order from an object side: a positive first lens unit not moving for zooming; a negative second lens unit moving during zooming; a negative third lens unit moving during zooming; and a fourth lens unit not moving for zooming and including an aperture stop, the fourth lens unit including first and second sub-lens units arranged on object side and image plane side of the aperture stop, respectively, in which a relationship between a maximum height of an axial ray from an optical axis in the first sub-lens unit when focusing at infinity at a wide angle end, and a maximum height of an axial ray at the aperture stop when focusing at infinity at the wide angle end and of full open aperture, and a lateral magnification of the fourth lens unit when focusing at infinity at the wide angle end are appropriately set. |
| 主权项 |
1. A zoom lens comprising, in order from, an object side to an image side:
a first lens unit having a positive refractive power that does not move for zooming; a second lens unit having a negative refractive power that moves during zooming; a third lens unit having a negative refractive power that moves during zooming; and a fourth lens unit having a positive refractive power that does not move for zooming and includes an aperture stop, the fourth lens unit including a first sub-lens unit arranged on the object side of the aperture stop, and a second sub-lens unit arranged on an image plane side of the aperture stop, wherein the following conditions are satisfied:
1.1<h41/hap<2.0−3.0<β4<−1.8where h41 represents a maximum height of an axial, ray from, an optical axis in the first sub-lens unit in a state in which focus is at infinity at a wide angle end, hap represents a maximum height of an axial ray from the optical axis at the aperture stop in a state of focusing on at infinity at the wide angle end and of full open aperture, and β4 represents a lateral magnification of the fourth lens unit in the state in which focus is at infinity at the wide angle end. |
