Lens control apparatus, optical apparatus and lens control method

An optical apparatus comprising:

• an optical system configured to include a first lens unit for zooming, a second lens unit for focusing, and a light amount adjuster for adjusting a light amount;
• and
• a lens control apparatus configured to move the first lens unit and the second lens unit,
• wherein the lens control apparatus comprises:
• a focus signal generator configured to generate a focus signal indicating a contrast of an object image formed by the optical system;
• a memory configured to store data generated for each predetermined in-focus distance and indicating a relationship between a position of the first lens unit and a position of the second lens unit;
• and
• a detector configured to detect information corresponding to a degree of a defocus for a focusing target,
• wherein the controller moves the second lens unit in an infinite direction and a close direction within a movable range set based on the information detected by the detector, and
• wherein the controller changes a movement amount of a center position of the movement of the second lens unit in the infinite and close direction according to an aperture size of the light amount adjuster.

A lens control method for moving a first lens unit for zooming and a second lens unit for focusing, the method comprising:

• a focus signal generation step of generating a focus signal indicating a contrast of an object image formed by an optical system, wherein the optical system includes the first lens unit, the second lens units, and a light amount adjuster, and wherein the light amount adjuster adjusts a light amount;
• a detection step of detecting information corresponding to a degree of a defocus for a focusing target;
• and
• a control step of controlling movement of the second lens unit accompanying movement of the first lens unit based on data generated for each predetermined in-focus distance and indicating a relationship between a position of the first lens unit and a position of the second lens unit,
• wherein the control step moves the second lens unit in an infinite direction and a close direction within a movable range set based on the information detected in the detection step, and
• wherein the control step changes a movement amount of a center position of the movement of the second lens unit in the infinite and close directions according to an aperture size of the light amount adjuster.