Patent ID: 7362512

Claim:
A lens apparatus for mounting on a camera including an image-pickup element, comprising: a focus lens unit which is movable in an optical axis direction for focusing; a zoom lens unit which is movable in the optical axis direction for zooming; a zoom detector for detecting a zoom value of the zoom lens unit; an aperture-stop device in which an aperture which can change in size to adjust a light quantity; a stop-value detector for detecting a stop value of the aperture-stop device; a splitting optical unit disposed between the aperture-stop device and the image-pickup element; a focus-condition detection unit for detecting a focus condition based on light from the splitting optical unit; an actuator for driving the focus lens unit in the optical axis direction; a controller for controlling the actuator based on an output from the focus-condition detection unit; and a manual operation member for moving the focus lens unit in the optical axis direction by a manual operation, wherein: the controller is configured to obtain an F-number of the lens apparatus based on an output from the zoom detector and an output from the stop-value detector; and when the F-number, adjustable by the stop value of the aperture stop device, exceeds a predetermined value, the controller causes the actuator to stop movement of the focus lens unit and switches to a condition in which the focus lens unit can be driven by the manual operation member.