Lens apparatus, image pickup apparatus, method of controlling lens apparatus, and computer-readable storage medium

An image pickup apparatus comprising;

• a lens apparatus;
• and
• an image pickup element configured to pick up an image formed by the lens apparatus,
• wherein the lens apparatus comprises:
• a first holding member configured to hold a first lens unit and be movable, manually or by an external driving unit, in an optical axis direction;
• a second holding member configured to hold a second lens unit and be electrically driven to move in the optical axis direction;
• a transmission member supported by the second holding member to be movable in a first range in the optical axis direction with respect to the second holding member;
• a driving unit configured to move the second holding member in the optical axis direction via the transmission member;
• a biasing member configured to bias the transmission member toward an end of the first range opposite to the first lens unit;
• a controller configured to control the driving unit;
• and
• an obtaining unit configured to obtain a position of the driving unit,
• wherein a movable range of the first holding member in the optical axis direction and a movable range of the second holding member in the optical axis direction overlap each other,
• wherein the controller determines a relative position between the driving unit and the second holding member in the optical axis direction, and changes a control of the driving unit based on the relative position.