Canon Kabushiki Kaisha

Olympus Imaging Corporation

Olympus Corporation

Masato Katayose

Kenji Ono

Kazuhito Hayakawa

Tetsuya Yanai

Junya Ichimura

Toru Matsumoto

Shunji Iwamoto

Makoto Nakahara

Hideyuki Nagaoka

Tomohiro Ino

A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, and a subsequent unit including a plurality of lens units. A distance between adjacent lens units changes during zooming. The first lens unit does not move and the second lens unit moves during zooming. The first lens unit consists of, in order from the object side to the image side, a first subunit and a second subunit. The first subunit consists of two positive lenses. The second subunit consists of a single positive lens and a single negative lens. A predetermined condition is satisfied.

Zoom lens, image pickup apparatus, and imaging system

A zoom lens L0 consists of a first lens unit L1 having negative refractive power, a middle group Lm including one or more lens units, and a last lens unit having positive refractive power. The first lens unit L1 includes a first negative lens, a second negative lens, and a third negative lens that are arranged sequentially in an order from an object side to an image side. The number of negative lenses included in the first lens unit L1 is four or less. The middle group Lm includes a plurality of cemented lenses each having a cemented surface that is convex toward the object side, and includes a lens element Ln that is disposed closest to the image side among lens elements having negative refractive power included in the middle group Lm. The zoom lens L0 satisfies a predetermined inequality.

Zoom lens and imaging apparatus including the same

A zoom lens consists of, 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 rear group including a plurality of lens units. A distance between adjacent lens units is changed during zooming. The rear group includes a diaphragm, an n-th lens unit disposed closest to an image plane and having a positive refractive power, and an (n−1)-th lens disposed on the object side of the n-th lens unit and having a negative refractive power. A predetermined condition is satisfied.

Zoom lens, extender, and image pickup apparatus

Provided is a zoom lens including, 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; a fourth lens unit having a negative refractive power; a fifth lens unit having a positive refractive power; a sixth lens unit having a negative refractive power; a seventh lens unit having a positive refractive power; and an eighth lens unit having a negative refractive power, in which an interval between each pair of adjacent lens units is changed for zooming.

Zoom lens, image pickup apparatus, and lens apparatus

A zoom lens Lincludes a first lens unit Lhaving a positive refractive power, a second lens unit Lhaving a negative refractive power, a third lens unit Lhaving a positive refractive power, an intermediate lens group LM including a plurality of lens units, and a last lens unit LR having a negative refractive power. An interval between the adjacent lens units changes during zooming. The zoom lens Lincludes an aperture stop SP. The intermediate lens group LM includes a negative lens unit LN having a negative refractive power. Both the negative lens unit LN and the last lens unit LR move to an object side during zooming from a wide-angle end to a telephoto end. The zoom lens Lsatisfies predetermined conditional inequalities.

A lens apparatus includes an imaging optical system includes an imaging optical system including a plurality of lenses, a first holding member holding at least a first lens closest to an object among the plurality of lenses, and configured to move in an optical axis direction of the imaging optical system to perform focusing, a barrel member provided on an outside of the first holding member, and a control unit configured to control a driving unit configured to move the first holding member. When focus is at infinity, an edge surface on an object side of the barrel member is positioned on the object side of a surface vertex of an object-side surface of the first lens. When focus is at infinity, an edge surface on the object side of the control unit is positioned on the object side of the surface vertex.

Lens apparatus and imaging system including the same

Provided is a zoom lens consisting of, 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 rear lens group including a plurality of lens units, and an interval between each pair of adjacent lens units is changed during zooming. When the rear lens group includes a lens unit Ln disposed closest to the image side among lens units including at least one positive lens and at least one negative lens, the first lens unit and the lens unit Ln are configured to move for zooming. The first lens unit includes, in order from the object side to the image side, a first positive lens, a second positive lens, and a first negative lens.

Zoom lens and image pickup apparatus including the same

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, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a rear unit having a plurality of lens units, a distance between adjacent lens units changing during zooming. A predetermined condition is satisfied.

Zoom lens and image pickup apparatus having the same

Provided is an optical system consisting of, in order from an object side to an image side, a front lens group (FLG), an aperture stop and a rear lens group (RLG), in which FLG includes at least one positive lens and at least one negative lens. A focal length of a positive lens Lp arranged closest to object side among the at least one positive lens, a focal length of a negative lens Ln arranged closest to image side among the at least one negative lens, a distance on an optical axis from an object-side lens surface of positive lens Lp to aperture stop, a distance on optical axis from an object-side lens surface of negative lens Ln to aperture stop, and a distance on optical axis from aperture stop to a lens surface closest to image side in RLG when focused at infinity are appropriately set.

Optical system and image pickup apparatus

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 unit including at least one lens unit. An interval between each pair of adjacent lens units is changed during zooming. The first lens unit includes, in order from the object side to the image side, a negative lens and a positive lens. A focal length f1 of the first lens unit, a focal length f2 of the second lens unit, a focal length f3 of the third lens unit, and an average value Nd1ave of refractive indices at a d-line of respective materials of the negative lens and the positive lens of the first lens unit are each appropriately set.

Zoom lens and image pickup apparatus

An optical system of this invention includes a first lens unit having a positive refractive power that is moved to an object side for focusing from infinity to a close distance. The first lens unit consists of, in order from the object side to an image side, a first lens sub-unit, an aperture stop, and a second lens sub-unit including a positive lens. A positive lens made of a material having an extraordinary dispersion characteristic &#x394;&#x3b8;gF which is largest among the positive lenses included in the second lens sub-unit is represented by positive lens Lp. An extraordinary dispersion characteristic of the material of the positive lens Lp, a focal length of the positive lens Lp, a focal length of the first lens unit, a focal length of the first lens sub-unit, and a focal length f1b of the second lens sub-unit are each appropriately set.

A zoom lens with a bent optical path includes, in order from the object side to the image side, a first lens unit including the reflecting member and having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. During zooming from the wide angle end to the telephoto end, the second lens unit moves closer to the first lens unit only toward the object side, the third lens unit moves in such a way that it becomes closest to the second lens unit at an intermediate focal length position in the course of zooming as compared to the state at the wide angle end and the state at the telephoto end, and the fourth lens unit moves. The zoom lens satisfies a certain condition.

Image pickup apparatus equipped with zoom lens with bent optical path

A zoom lens includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit including a lens. The distance between the first lens unit and the second lens unit is smaller at the telephoto end than at the wide angle end, and the distance between the second lens unit and the third lens unit changes during zooming from the wide angle end to the telephoto end. The first lens unit consists, in order from the object side, of a front sub lens unit having a negative refractive power, an optical path bending member, and a rear sub lens unit having a positive refractive power. The front sub lens unit includes a biconcave single lens, and the rear sub lens unit includes one or two single lenses.

Growing community of inventors

Utsunomiya, Japan

Masato Katayose