Patent ID: 8908285

Claim:
A zoom lens for an image pickup apparatus, the zoom lens comprising in order from an object side to an image side: a front unit including a first lens unit having a positive refractive power and a second lens unit having a positive or negative refractive power; a reflective mirror which bends an optical path from the front unit; and a rear unit including two or more lens units, wherein: during zooming, the reflective mirror is not moved, and the first lens unit and at least two lens units included in the two or more lens units of the rear unit are moved in directions of optical axes of the front and rear units, respectively; and when the zoom lens is retracted into a body of the image pickup apparatus, at least one of (a) rotation of the reflective mirror such that a normal line to a reflective surface of the reflective mirror is brought closer to parallel to the optical axis of the rear unit and (b) axial movement of the reflective mirror in the direction of the optical axis of the rear unit is performed, and at least part of the front unit is moved into a space formed by the at least one of the rotation and the axial movement of the reflective mirror, and wherein the following conditions are satisfied: 10.5 <ft/|fn|< 30.0 0.80<( Lf−L )/ Lm< 1.30 where fn represents a focal length of a strongest negative power lens unit having a negative refractive power whose absolute value is maximum among those lens units each having a negative refractive power and included in the front unit, ft represents a focal length of the entire zoom lens at a telephoto end, Lm represents a length of the reflective mirror in a sectional plane including the optical axes of the front and rear units, Lf represents a sum of optical-axis-directional thicknesses of respective lens units included in the front unit, and L represents a shorter one of lengths in the direction of the optical axis of the front unit from an apex of a most-object side lens surface of the first lens unit to ends of the reflective mirror in the sectional plane after the zoom lens is retracted in the body of the image pickup apparatus.