Interchangeable lens attachable to image pickup apparatus that provide contrast AF, control method therefor, image pickup apparatus and control method therefor

摘要

The interchangeable lens includes a focus actuator to move a focus lens, a memory storing speed control data for the focus actuator and end position data showing infinity side and close side end positions of a movable range of the focus lens, a lens controller to control the drive speed of the focus actuator by using the speed control data. The lens controller receives, from an image pickup apparatus, timing information showing a timing relating to acquisition of focus information, performs an end reachability determination for predictively determining, by using the timing information, the speed control data and the end position data, whether or not the focus lens reaches the infinity side or close side end position by a scheduled focus information acquisition timing, and sends information showing a result of the end reachability determination to the image pickup apparatus.

主权项

1. An interchangeable lens detachably attachable to an image pickup apparatus and communicable with the image pickup apparatus, the interchangeable lens comprising:
an image pickup optical system including a focus lens; a focus actuator that moves the focus lens; a first memory that stores speed control data to be used for control of drive speed of the focus actuator; a second memory that stores end position data showing an infinity side end position and a close side end position of a movable range of the focus lens; and a lens controller configured to control the drive speed of the focus actuator using the speed control data, wherein the image pickup apparatus comprises:
an image sensor that photoelectrically converts an object image formed by the image pickup optical system into an image pickup signal; anda focus controller configured to acquire, using the image pickup signal, focus information corresponding to image contrast that changes with movement of the focus lens and to control a focusing movement of the focus lens to an in-focus position using the focus information, and wherein the lens controller is configured to:
receive, from the focus controller, timing information showing a timing relating to acquisition of the focus information;perform an end reachability determination to predictively determine, using the timing information, the speed control data, and the end position data, whether or not the focus lens reaches one of the infinity side end position or the close side end position by a scheduled focus information acquisition timing at which the focus controller is to acquire the focus information;send result information showing a result of the end reachability determination to the focus controller.