Canon Kabushiki Kaisha

Shigenobu Sugita

Suguru Inoue

Yuichi Gyoda

Masakazu Kodaira

Kenji Saitsu

Kaoru Eguchi

Yuki Nagao

Yoshiaki Ida

Yuichi Kosaka

Takahito Nakamichi

An interchangeable lens apparatus attachable to an imaging apparatus configured to move an image sensor in an image stabilization includes an imaging optical system, a storage unit configured to store image circle information including a relationship between an imaging condition and position information of an image circle of the imaging optical system, and a transmission unit configured to transmit at least part of the image circle information to the imaging apparatus.

Imaging apparatus to which an interchangeable lens apparatus is attached that utilize image circle information of an imaging optical system in the interchangeable lens apparatus

A zoom lens including in order from an object side: a positive first unit including negative and positive lenses, a positive second unit, a negative third unit, a positive fourth unit, and a rear lens group, wherein at a time of zooming from a wide angle end to a telephoto end, the first unit moves to the object side, a space between the first and second units increases, and a space between the second and third units increases, and a focal length of the zoom lens at the telephoto end, a zoom lens length at the telephoto end, a change amount of the space between the first and second units during zooming from the wide angle end to the telephoto end, a change amount of the space between the second and third units during zooming from the wide angle end to the telephoto end are appropriately set.

Zoom lens and image pickup apparatus

Imaging apparatus and interchangeable lens apparatus that utilize image circle information of an imaging optical system in the interchangeable lens apparatus

An optical system includes a first lens unit that has a positive refractive power; a second lens unit that is arranged to move during focusing and has a positive or negative refractive power; and a third lens unit that has a positive or negative refractive power. The first lens unit, the second lens unit, and the third lens unit are disposed in that order from an object side to an image side. During the focusing, an interval between adjacent lens units changes. In the optical system, a focal length f of the entire optical system, a distance LD along an optical axis from a lens surface of the first lens unit that is closest to the object side to an image plane, a material of positive lenses included in the first lens unit, and an arrangement of the positive lenses included in the first lens unit are appropriately set.

Optical system and image pickup apparatus including the same

A lens apparatus that includes an optical system including a positive lens, the lens apparatus including a holding member arranged to hold the positive lens, an exterior member arranged to accommodate the holding member, and an engaging mechanism arranged to engage the holding member and the exterior member to each other.

Lens apparatus and an image pickup apparatus including same

The zoom lens of the present invention includes a positive lens unit LP (LULP) disposed closest to an object side, a negative lens unit LNF (LULNF) disposed at an image side of LULP, and an aperture stop disposed at image side of LULNF. The zoom lens further includes at image side of aperture stop, successively in order from object side to image side, a positive lens unit LP, a negative lens unit LN(LULN), a positive lens unit LP(LULP), and a negative lens unit LN(LULN), in which intervals between adjacent lens units are changed during zooming. LULNmoves during focusing. The focal length and the total length of zoom lens at a telephoto end, the changing amount from interval between LULPand LULNat a wide angle end to that at telephoto end, and the total length of zoom lens at wide angle end are appropriately set.

An optical system includes a plurality of lenses. The distance from the object side lens surface of a lens arranged an the most object side to the image plane is longer than the focal length of the entire system. The material of a positive lens Garranged on the most object side among positive lenses included in the optical system, and the arrangement and material of a negative lens Gn located on the most object side among negative lenses arranged an the image side of the positive lens Gare appropriately set.

Optical system and image pickup apparatus having the same

Provided is a zoom lens, including, in order from an object side to an image side: a negative first lens unit; a positive second lens unit; a negative third lens unit; a positive fourth lens unit; and a positive fifth lens unit, the first, second, third, fourth, and fifth lens units having an interval between each pair of adjacent lens units changed for zooming. The second, fourth, and fifth lens units are configured to move toward the object side for zooming from a wide-angle end to a telephoto end. A focal length of the fourth lens unit, a focal length of the fifth lens unit, an amount of movement of the fifth lens unit for zooming from the wide-angle end to the telephoto end, and a focal length of an entire system of the zoom lens at the wide-angle end are each appropriately set.

Zoom lens and image pickup apparatus including the same

A zoom lens of the present invention is a zoom lens including a variable stop whose aperture diameter is variable in zooming, the variable stop is a stop which determines a minimum f-number of the zoom lens at least at one of zoom positions in an entire zoom range, and the aperture diameter of the variable stop is variable in focusing at least at a telephoto end in the entire zoom range.

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; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a positive refractive power; a fifth lens unit having a negative refractive power; and a rear lens group including one or more lens units, in which the third lens unit is configured to move toward the object side during zooming from a wide angle end to a telephoto end, in which an interval between adjacent lens units is changed during zooming, in which the fourth lens unit is moved in a direction having a vertical component to an optical axis during image stabilization, and in which focal lengths of the third and fourth lens units are appropriately set.

Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; a fourth lens unit having a positive refractive power; and a rear lens group including at least one lens unit, the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the rear lens group having an interval between each pair of adjacent lens units changed for zooming. The third lens unit is configured to move for focusing, and at least a part of the fourth lens unit forms a lens system IS, which is configured to move in a direction including a component of a direction perpendicular to an optical axis for image stabilization.

In an optical system which includes a positive lens Gp and in which a distance on an optical axis from an object-side lens surface of a lens disposed closest to an object side to an image surface is shorter than a focal length of an entire system, an arrangement and a material of the positive lens Gp, and an arrangement of a focus unit are set appropriately.

In a converter device that is attached between a lens device, which is attachable to and detachable from an image capturing apparatus, and the image capturing apparatus, and that has a reimaging optical system configured to reimage a primary image formed by the lens device on an image plane as a secondary image, the imaging magnification of the reimaging optical system and imaging positions of a primary image and a secondary image are appropriately set.

Converter device and image capturing apparatus

The interchangeable lens apparatus provided with an image capturing optical system and being detachably attachable to an image capturing apparatus, the image capturing apparatus being configured to detect a defocus amount of the image capturing optical system by using a signal acquired by photoelectric conversion of an optical image formed by the image capturing optical system. The interchangeable lens apparatus includes a focus lens included in the image capturing optical system, and a memory to store information on a focus sensitivity indicating a relation between a unit movement amount of the focus lens and a displacement amount of the optical image. The information on the focus sensitivity is information for enabling acquiring the focus sensitivity different depending on an image height.

Interchangeable lens apparatus and image capturing apparatus capable of acquiring in-focus state at different image heights, and storage medium storing focusing program

Growing community of inventors

Shimotsuke, Japan

Shigenobu Sugita