Patent ID: 9678317
Date: 2017-06-13
CPC Classifications: G02B,H04N

Claim:
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: where 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.