Abstract: A zoom lens includes a focus lens unit that moves in focus adjustment, a magnification lens unit including lens units that move in magnification, and a relay lens unit that does not move for magnification, in this order from the object side toward the image side, and a correction lens unit that is disposed in the focus lens unit or magnification lens unit and moves in the optical axis direction to correct displacement of the in-focus position. The amounts of change in in-focus position at the wide angle and telephoto ends with the correction lens unit moved by 1 mm in the optical axis direction, the maximum absolute value of the amount of movement of the correction lens unit for correcting displacement of the in-focus position, and the maximum absolute value of the amount of movement of the lens units in the magnification lens unit are set as appropriate.

Abstract: A zoom lens includes a focus lens unit that moves in focus adjustment, a magnification lens unit including lens units that move in magnification, and a relay lens unit that does not move for magnification, in this order from the object side toward the image side, and a correction lens unit that is disposed in the focus lens unit or magnification lens unit and moves in the optical axis direction to correct displacement of the in-focus position. The amounts of change in in-focus position at the wide angle and telephoto ends with the correction lens unit moved by 1 mm in the optical axis direction, the maximum absolute value of the amount of movement of the correction lens unit for correcting displacement of the in-focus position, and the maximum absolute value of the amount of movement of the lens units in the magnification lens unit are set as appropriate.

Abstract: Provided is a zoom lens including, in order from an object side: a first lens unit not moving for zooming; a second lens unit moving during the zooming; at least one lens unit moving during the zooming; and a rear lens group. The first lens unit includes a first lens sub unit not moving for focusing, and a second lens sub unit moving during the focusing. The first lens sub unit includes a negative lens and a positive lens. A focal length of the first lens unit, a distance on an optical axis from a lens surface closest to an image side of the first lens sub unit to a rear principal point position of the first lens sub unit, and a focal length of the zoom lens at a telephoto end are appropriately set.

Abstract: A zoom lens includes, in order from an object side: a positive first lens unit that does not move for zooming and comprises a negative first sub-lens unit, a positive second sub-lens unit that moves during adjustment of a focal point, and a positive third sub-lens unit composed of at least one negative lens, and at least two positive lenses; a lens group including at least two lens units that move during zooming; an aperture stop; and a positive last lens unit that does not move for zooming. Focal lengths of the first lens unit, the first sub-lens unit, and the zoom lens at a wide angle end, imaging magnification of the last lens unit, average values of an Abbe constant for d-line of the at least one negative lens and of the at least two positive lenses are appropriately set.

Abstract: Provided is an image pickup apparatus including, in order from an object side: a first lens unit; a stop; a second lens unit having a positive refractive power; and an image pickup element. The second lens unit includes a second lens sub-unit including only at least one positive lens. A refractive index (N2a) at a d-line of every lens included in the second lens sub-unit, an Abbe constant (?2a) and a partial dispersion ratio (?2a) of the every lens, a temperature-related relative refractive index change (dn2a/dTrelative) at the d-line, a focal length (f) of the overall system, a focal length (f2a) of the second lens sub-unit, an overall length (TD) of an image pickup lens, and a distance (BF) from an image-side surface of a lens arranged closest to an image side in the image pickup lens to an image plane of the image pickup element satisfy predetermined relationships.

Abstract: Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a positive refractive power which does not move for zooming; a second lens unit having a negative refractive power which moves during zooming; and an N-th lens unit having a positive refractive power which does not move for zooming and is arranged closest to the image side. In the zoom lens, the N-th lens unit includes in order from an object side: a first sub-lens unit; and a second sub-lens unit which is movable, and a lateral magnification at a wide angle end of the N-th lens unit and a lateral magnification at a wide angle end of the second sub-lens unit of the N-th lens unit when an axial ray enters from infinity in a state in which focus is at the infinity are appropriately set.

Abstract: A zoom lens includes in order from object side to image side: a positive first lens unit that does not move for zooming; a negative second lens unit that moves during zooming; and a positive N-th lens unit that does not move for zooming, the N-th lens unit being arranged closest to the image side. The first lens unit includes, in order from object side to image side: a negative first sub-lens unit that does not move for focusing; a positive second sub-lens unit that moves along an optical axis during focusing; and a positive third sub-lens unit that does not move for focusing. Focal length of the first lens unit, focal length at wide angle end of the zoom lens, and lateral magnification at wide angle end satisfy predetermined conditions.

Abstract: Provided is a zoom lens including, in order from an object side: a first lens unit not moving for zooming; a second lens unit moving during the zooming; at least one lens unit moving during the zooming; and a rear lens group. The first lens unit includes a first lens sub unit not moving for focusing, and a second lens sub unit moving during the focusing. The first lens sub unit includes a negative lens and a positive lens. A focal length of the first lens unit, a distance on an optical axis from a lens surface closest to an image side of the first lens sub unit to a rear principal point position of the first lens sub unit, and a focal length of the zoom lens at a telephoto end are appropriately set.

Abstract: A zoom lens includes in order from object side to image side: a positive first lens unit that does not move for zooming; a negative second lens unit that moves during zooming; and a positive N-th lens unit that does not move for zooming, the N-th lens unit being arranged closest to the image side. The first lens unit includes, in order from object side to image side: a negative first sub-lens unit that does not move for focusing; a positive second sub-lens unit that moves along an optical axis during focusing; and a positive third sub-lens unit that does not move for focusing. Focal length of the first lens unit, focal length at wide angle end of the zoom lens, and lateral magnification at wide angle end satisfy predetermined conditions.

Abstract: Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a positive refractive power which does not move for zooming; a second lens unit having a negative refractive power which moves during zooming; and an N-th lens unit having a positive refractive power which does not move for zooming and is arranged closest to the image side. In the zoom lens, the N-th lens unit includes in order from an object side: a first sub-lens unit; and a second sub-lens unit which is movable, and a lateral magnification at a wide angle end of the N-th lens unit and a lateral magnification at a wide angle end of the second sub-lens unit of the N-th lens unit when an axial ray enters from infinity in a state in which focus is at the infinity are appropriately set.

Abstract: A zoom lens includes, in order from an object side: a positive first lens unit that does not move for zooming and comprises a negative first sub-lens unit, a positive second sub-lens unit that moves during adjustment of a focal point, and a positive third sub-lens unit composed of at least one negative lens, and at least two positive lenses; a lens group including at least two lens units that move during zooming; an aperture stop; and a positive last lens unit that does not move for zooming. Focal lengths of the first lens unit, the first sub-lens unit, and the zoom lens at a wide angle end, imaging magnification of the last lens unit, average values of an Abbe constant for d-line of the at least one negative lens and of the at least two positive lenses are appropriately set.

Abstract: A three-dimensional image pickup optical system for forming two different images having a parallax alternately in time sequence on a single image pickup element, includes, in order from object side: a front system including a pair of negative 1f-lens units, a pair of an optical path deflecting units, and a combining unit for combining two optical paths on the same optical axis; and a rear system including a positive 1b-lens unit which does not move for magnification-varying, a lens unit moving for magnification-varying, and a stop, in which: the front system includes a pair of light quantity control units disposed in optical paths for the eyes on the object side of the combining unit, for switching left and right subject images alternately in a time sharing manner; and power arrangement of the 1f-lens units and the 1b-lens unit is set appropriately.

Abstract: Provided is an image pickup apparatus including, in order from an object side: a first lens unit; a stop; a second lens unit having a positive refractive power; and an image pickup element. The second lens unit includes a second lens sub-unit including only at least one positive lens. A refractive index (N2a) at a d-line of every lens included in the second lens sub-unit, an Abbe constant (?2a) and a partial dispersion ratio (?2a) of the every lens, a temperature-related relative refractive index change (dn2a/dTrelative) at the d-line, a focal length (f) of the overall system, a focal length (f2a) of the second lens sub-unit, an overall length (TD) of an image pickup lens, and a distance (BF) from an image-side surface of a lens arranged closest to an image side in the image pickup lens to an image plane of the image pickup element satisfy predetermined relationships.

Abstract: A zoom lens includes, in order from an object side: a first lens unit having positive refractive power which does not move for varying magnification; a magnification-varying lens unit including at least two lens units which move for varying magnification; an aperture stop; and an imaging lens unit having positive refractive power which does not move for varying magnification, in which: the first lens unit includes, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power; the second sub-lens unit is driven to the object side so as to perform focus adjustment to an object at a short distance; and the following expression is satisfied: 0.07<f1/f11<0.35, where f1 represents a focal length of the first lens unit, and f11 represents a focal length of the first sub-lens unit.

Abstract: A zoom lens includes, in order from object side: a positive first lens unit which does not move for zooming; a zoom lens unit including at least two lens units which move for zooming; a stop; and a positive imaging lens unit which does not move for zooming, in which: the first lens unit includes, in order from object side, a positive first sub-lens unit, a negative second sub-lens unit, and a positive third sub-lens unit; the third sub-lens unit includes a movable positive sub-third sub-lens unit; the second sub-lens unit and sub-third sub-lens unit are driven to object side for focusing to a close object; and focal length f12 of the second sub-lens unit, focal length f13f of the sub-third sub-lens unit, drive amount ?×12 of the second sub-lens unit in focusing, and drive amount ?×13f of the sub-third sub-lens unit in focusing satisfy ?2.5<f12/f13f<?0.4 and 0.05<?×13f/?×12<5.0.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, and a rear group including at least one lens unit. During zooming from a wide angle end to a telephoto end, the first and third lens units move to the object side, the second lens unit moves to the image side, and the aperture stop moves to the object side along a convex path. Radii of curvature of object- and image-side lens surfaces of a lens closest to the object side in the second lens unit, focal lengths of the entire zoom lens at the wide angle end and the telephoto end, and focal lengths of the first and second lens units are set properly.

Abstract: A zoom lens includes, in order from an object side: a first lens unit having positive refractive power which does not move for varying magnification; a magnification-varying lens unit including at least two lens units which move for varying magnification; an aperture stop; and an imaging lens unit having positive refractive power which does not move for varying magnification, in which: the first lens unit includes, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power; the second sub-lens unit is driven to the object side so as to perform focus adjustment to an object at a short distance; and the following expression is satisfied: 0.07<f1/f11<0.35, where f1 represents a focal length of the first lens unit, and f11 represents a focal length of the first sub-lens unit.

Abstract: A zoom lens includes, in order from object side: a positive first lens unit which does not move for zooming; a zoom lens unit including at least two lens units which move for zooming; a stop; and a positive imaging lens unit which does not move for zooming, in which: the first lens unit includes, in order from object side, a positive first sub-lens unit, a negative second sub-lens unit, and a positive third sub-lens unit; the third sub-lens unit includes a movable positive sub-third sub-lens unit; the second sub-lens unit and sub-third sub-lens unit are driven to object side for focusing to a close object; and focal length f12 of the second sub-lens unit, focal length f13f of the sub-third sub-lens unit, drive amount ?×12 of the second sub-lens unit in focusing, and drive amount ?×13f of the sub-third sub-lens unit in focusing satisfy ?2.5<f12/f13f<?0.4 and 0.05<?×13f/?×12<5.0.

Abstract: A zoom lens including in order from an object side to an image side: a positive first lens unit which does not move for zooming; a negative second lens unit for magnification, and a rear lens group including two or more lens units, in which: the first lens unit includes a first subunit not moving for focusing and a second subunit moving for focusing, and the first subunit includes two or more negative lenses and one or more positive lenses; and an average Abbe number and an average partial dispersion ratio of materials of the negative lenses included in the first subunit, average Abbe number and average partial dispersion ratio of materials of the one or more positive lenses included in the first lens unit, combined focal length of the negative lenses included in the first subunit, and focal length of the zoom lens at telephoto end are appropriately set.

Abstract: A three-dimensional image pickup optical system for forming two different images having a parallax alternately in time sequence on a single image pickup element, includes, in order from object side: a front system including a pair of negative 1f-lens units, a pair of an optical path deflecting units, and a combining unit for combining two optical paths on the same optical axis; and a rear system including a positive 1b-lens unit which does not move for magnification-varying, a lens unit moving for magnification-varying, and a stop, in which: the front system includes a pair of light quantity control units disposed in optical paths for the eyes on the object side of the combining unit, for switching left and right subject images alternately in a time sharing manner; and power arrangement of the 1f-lens units and the 1b-lens unit is set appropriately.