Canon Kabushiki Kaisha

Masakazu Yamagishi

Shinichiro Saito

Makoto Nakahara

Suguru Inoue

Akira Mizuma

An optical system includes a first lens unit having positive refractive power, a second lens unit, and a third lens unit having negative refractive power arranged in order from an object side to an image side. The second lens unit moves in focusing, thereby changing a distance between adjacent lens units. The first lens unit includes a positive lens, and the third lens unit includes a negative lens. A focal length of the positive lens, a focal length of the negative lens, a focal length of the third lens unit, and a back focus of the optical system are appropriately set.

Optical system and imaging apparatus including the same

An optical system is constituted of a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and moving when focusing is performed, and a third lens unit which are arranged in this order from an object side to an image side, and distances between neighboring lens units are changed when focusing is performed. In the optical system, a back focus, arrangement of the second lens unit, and the like are appropriately set.

Optical system and image capturing apparatus including the same

An optical system includes a first lens unit Bhaving a positive refractive power, a second lens unit B, and a third lens unit Bdisposed in order from an object side to an image side. The second lens unit Bmoves in focusing so that an interval between adjacent lens units among the first, second, and third lens units changes. The first lens unit Bincludes a positive lens Gdisposed closest to the object side and a negative lens Gbeing a closest negative lens with respect to the object side. The optical system satisfies a predetermined condition.

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Saitama, Japan

Masakazu Yamagishi