Canon Kabushiki Kaisha

Takahiro Hatada

Shinichiro Saito

Shunji Iwamoto

Satoshi Maetaki

Suguru Inoue

Kohei Kimura

Makoto Nakahara

Takeharu Nakada

Shu Ito

An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a diaphragm, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power. A distance between adjacent lens units is changed during focusing. The second lens unit is moved to the image side during focusing from an object at infinity to a short-distance object. The first lens unit includes a positive lens closest to an object and two or more negative lenses. The second lens unit consists of a single negative lens. A predetermined condition is satisfied.

Optical system and image pickup apparatus having the same

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, and a rear unit having a positive refractive power as a whole. A distance between the first lens unit and the rear unit is changed during zooming. The rear unit includes a subunit that is moved in a direction having a component of a direction orthogonal to an optical axis during image stabilization. The first lens unit includes, in order from the object side to the image side, three or more negative lenses. A predetermined condition is satisfied.

Zoom lens and image pickup apparatus having the same

A zoom lens Lincludes a first lens group Land a rear group LR disposed in order from an object side to an image side, the first lens group Lhaving a negative refractive power and the rear group LR having a positive refractive power as a whole. The rear group LR includes a partial group LP, a partial group LN, and two or more lens groups between which distances change in zooming. When image blur is corrected, the partial group LN moves in a direction including a component of a direction perpendicular to an optical axis. A lens surface closest to the object side among lens surfaces of the partial group LN and a lens surface closest to the image side among the lens surfaces of the partial group LN are both concave surfaces.

Zoom lens and imaging apparatus including the same

An optical system with a fixed focal length includes a front lens unit closest to an object, a rear lens unit having a negative refractive power closest to an image plane, and a middle unit having a positive refractive power as a whole, including one or more lens units, and disposed between the front lens unit and the rear lens unit. A distance between adjacent lens units changes during focusing. The rear lens unit includes two or more positive lenses. A predetermined condition is satisfied.

Optical system and image pickup apparatus

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, and a subsequent unit having a positive refractive power as a whole. A distance between adjacent lens units changes during zooming. The first lens unit includes a single lens, and the subsequent unit includes a third lens unit having a positive refractive power closest to the object side in the subsequent unit and a lens unit LP having a positive refractive power closest to the image side among the zoom lenses. During zooming from a wide-angle end to a telephoto end, the second lens unit moves toward the object side. A predetermined condition is satisfied.

Zoom lens and imaging apparatus having the same

A zoom lens comprising, 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, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power an interval between adjacent lens units changing and the first to fourth lens units moving during zooming. An image blur is corrected by moving a sub-unit having a negative refractive power as a whole in the third lens unit orthogonally to an optical axis. A predetermined conditions are satisfied.

Zoom lens, imaging apparatus and imaging system having the same

Provided is a zoom lens including, in order from an object side to an image side, a positive first lens unit, a negative second lens unit, a positive third lens unit, a positive fourth lens unit and a rear lens group consisting of at least one lens unit. An interval between each pair of adjacent lens units is changed during zooming. The rear lens group includes a negative N-th lens unit configured to move during focusing. The second lens unit and the third lens unit are configured to move during zooming. A focal length of the second lens unit, a focal length of the third lens unit, a focal length of the fourth lens unit, a lateral magnification of the fourth lens unit at a wide angle end and a lateral magnification of the fourth lens unit at a telephoto end are appropriately set.

Zoom lens and image pickup apparatus

Provided is a zoom lens including a plurality of lens units, which consist of, in order from an object side to an image side: a positive first lens unit; a negative second lens unit; and a rear lens group including a plurality of lens units and having a positive refractive power as a whole, the first lens unit including a negative lens Garranged closest to the object side, and a plurality of positive lenses arranged on the image side of the negative lens, and the rear lens group includes a positive lens Grp. A lens unit arranged closest to the image side in the rear lens group includes the positive lens Grp. At this time, an Abbe number of the negative lens G, a refractive index of the positive lens Grp, and back focuses at a wide-angle end and a telephoto end, respectively, are appropriately set.

An optical system used in an imaging apparatus includes an optical element. In a case where the optical element is disposed on a magnification side with respect to an intersection point of an optical axis and a chief paraxial ray, the optical element is a negative lens, and in a case where the optical element is disposed on a reduction side with respect to the intersection point, the optical element is a positive lens. The optical element is configured to satisfy all of the following conditional expressions:30&#x2264;&#x3bd;&#x2264;401.225&#x2264;[&#x2212;(14.387/&#x3bd;)]&#x2264;1.2760.4300&#x2264;[&#x3b8;&#x2212;(2.9795/&#x3bd;)]&#x2264;0.5010,where &#x3bd;d represents an Abbe number of the optical element, &#x3b8;gF is a partial dispersion ratio of the optical element for g-line and F-line, and nd is a refractive index of the optical element for d-line.

Optical system and optical apparatus including the same

The zoom lens according to the present invention consists of, in order from an object side to an image side, a positive first lens unit, a negative second lens unit, and a positive rear unit including at least four lens units. The second lens unit moves toward the object side during zooming from a wide angle end to a telephoto end, and an interval between each pair of adjacent lens units is changed during zooming. The rear unit includes a positive lens unit LP, which is arranged closest to the image side. Focal lengths of the zoom lens at the wide angle end and at the telephoto end, focal lengths of the first lens unit and the second lens unit, and a distance from the lens surface of the lens unit LP on the image side to an image plane at the telephoto end are each set appropriately.

A lens apparatus includes an imaging optical system, a movable member holding at least one of lenses and configured to move in a direction including a component perpendicular to an optical axis of the imaging optical system, a fixed member whose movement in the direction is restricted, a coil provided at one of the movable member and the fixed member, a magnet provided at the other of the movable member and the fixed member, and a first shield member configured to cover at least a part of the coil as viewed in a direction parallel to the optical axis and as viewed in the direction perpendicular to the optical axis. At least a part of the first shield member being arranged closer to an image plane than the coil, and a predetermined conditional expression is satisfied.

Lens apparatus and imaging system including the same

A zoom lens includes a first lens unit Lhaving positive refractive power, a second lens unit Lhaving negative refractive power, and a rear lens group LB including a plurality of lens units and having positive refractive power. The rear lens group LB includes a lens unit LF configured to move during focusing and having negative refractive power, a lens unit LN disposed on the image side of the lens unit LF and having negative refractive power, and a lens unit LP disposed on the image side of the lens unit LN and having the largest positive refractive power among the lens units having positive refractive power. The lens units LP and LN move to the object side in a predetermined locus during zooming from the wide-angle end to the telephoto end, and the lens units LP and LF satisfy a predetermined conditional expression.

Zoom lens and image pickup apparatus including same

An optical system includes a negative lens satisfying the following conditional expressions:30&#x2264;&#x3bd;&#x2264;40,1.225&#x2264;[&#x2212;(14.387/&#x3bd;)]&#x2264;1.276, and0.4300&#x2264;[&#x3b8;&#x2212;(2.9795/&#x3bd;)]&#x2264;0.5010,where &#x3bd;d is an Abbe number of the negative lens, &#x3b8;gF is a partial dispersion ratio of the negative lens at a g-line and an F-line, and nd is a refractive index of the negative lens at a d-line.

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Utsunomiya, Japan

Takahiro Hatada