ZOOM LENS AND IMAGING APPARATUS

摘要

A zoom lens includes: a first lens group having a positive refractive power which is fixed while changing magnification; a second lens group constituted by two or more magnification changing groups; an aperture stop; and a third lens group having a positive refractive power which is fixed while changing magnification, provided in this order from an object side. The magnification changing groups respectively move along an optical axis while changing magnification from a wide angle end to a telephoto end. The zoom lens satisfies the following conditional formula:;u′/u<0.5  (1);wherein u is the angle of inclination of a paraxial chief ray of light that enters the lens surface most toward the object side within the first lens group, and u′ is the angle of inclination of the paraxial chief ray of light that exits the lens surface most toward an image side within the first lens group.

主权项

1. A zoom lens, substantially consisting of:
a first lens group having a positive refractive power which is fixed while changing magnification; a second lens group constituted by two or more magnification changing groups; an aperture stop; and a third lens group having a positive refractive power which is fixed while changing magnification, provided in this order from an object side; the magnification changing groups respectively moving along an optical axis while changing magnification from a wide angle end to a telephoto end; and the zoom lens satisfying the following conditional formula:
u′/u<0.5  (1) wherein u is the angle of inclination of a paraxial chief ray of light that enters the lens surface most toward the object side within the first lens group, and u′ is the angle of inclination of the paraxial chief ray of light that exits the lens surface most toward an image side within the first lens group.