Zoom lens, and image pickup apparatus having the same

• Main Authors: Shunji Iwamoto, Takeharu Nakada
• Format: Patent
• Language: English
• Published: 03.07.2024
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

A zoom lens includes multiple lens units with, from an object to an image side, first L1, second L2, third L3 and fourth L4 lens units having negative, positive, negative and positive refractive power respectively. A distance between adjacent lens units changes during zooming from a wide-angle to a telephoto end. The first lens unit includes three or more lenses and is fixed relative to an image plane during zooming. Predetermined inequalities specifying focal length ratios -f1/f2 of the first and second lens units respectively and -f1/f4 for the first and fourth lens units respectively are satisfied. A ratio of the optical axis distance LD1 between outermost lens surfaces of the first lens unit to the optical axis distance TTL from a lens, closest to the object, surface's object side to the image plane, at the wide-angle end is also satisfied. Inequalities for ratios between an air conversion amount of a distance on the optical axis from a lens surface on the image side of the lens closest to the image plane at the wide-angle end to the image plane or back focus, to the focal length of the first lens unit or the distance TTL may be satisfied.