Abstract: Provided is an optical device including: first to fourth lens units; first to fourth drive units configured to move the first to fourth lens units in a direction along an optical axis, respectively; a stop member having a variable aperture diameter; and a fifth drive unit configured to change the aperture diameter. One of drive units arranged closer to an image than the stop member among the first to fourth drive units, which has the longest length in the direction along the optical axis, and the fifth drive unit are arranged in different ones of four equally divided spaces around the optical axis.

Abstract: A lens apparatus includes a fixed barrel, a first optical element, a rotary barrel configured to be rotated relative to the fixed barrel about an optical axis of the first optical element and move the first optical element; a contact member including rolling members respectively arranged at positions about the optical axis. The rolling members are in contact with the rotary barrel. The contact member is restricted in rotation relative to the fixed barrel about the optical axis. A pressing member presses the contact member toward the rotary barrel. A second optical element is different from the first optical element. An operation member is configured to be rotated relative to the fixed barrel about the optical axis and move the second optical element. A space, through which the operation member passes, is formed between two of the rolling elements in a circumference of the contact member.

Abstract: Provided is a lens apparatus, including: a fixed barrel; a first optical element; a rotary barrel configured to be rotated relative to the fixed barrel about an optical axis of the first optical element and move the first optical element; a contact member including rolling members respectively arranged at positions about the optical axis, the rolling members being into contact with the rotary barrel, the contact member being restricted in rotation relative to the fixed barrel about the optical axis; a pressing member pressing the contact member toward the rotary barrel; a second optical element being different from the first optical element; and an operation member configured to be rotated relative to the fixed barrel about the optical axis and move the second optical element, wherein a space, through which the operation member passes, is formed between two of the rolling elements in a circumference of the contact member.