Patent ID: 11921268
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A zoom lens comprising in order from an object side to an image side:
a lens unit closest to the object side and having a positive refractive power,
an intermediate unit including at least three lens units and an aperture stop, and
a lens unit closest to the image side and having a positive refractive power,
wherein a distance between each pair of adjacent lens units changes in zooming,
wherein the lens unit closest to the object side is configured not to move for zooming, and the at least three lens units and the aperture stop are configured to move in zooming,
wherein the lens unit closest to the image side includes a first positive lens, and
wherein the following conditions are satisfied:

0.65≤θgFp1+0.0011×νp1≤0.70

0.10≤fp1/fm≤0.58, where νp1 is an Abbe number based on a d-line of the first positive lens, θgFp1 is a partial dispersion ratio with respect to a g-line and an F-line of the first positive lens, fp1 is a focal length of the first positive lens, and fm is a focal length of the lens unit closest to the image side.