| 摘要 |
<p>A lens tube provided with: an optical system, the focal length of which can be changed; an actuator; a plurality of manipulation units; and a control unit. The actuator drives a zoom lens in the optical system so as to change the focal length. The plurality of manipulation units include a first manipulation unit and a second manipulation unit, each of which can be manipulated by a user to change the focal length. When the user manipulates either the first manipulation unit or the second manipulation unit, the control unit controls the actuator so as to change the focal length.</p> |
