Lens unit, image pickup apparatus, and methods of controlling lens unit and image pickup apparatus

An image pickup apparatus on which a lens unit is capable of being removably mounted, the lens unit including (1) an image pickup optical system including a magnification varying lens configured to perform a magnification varying operation and a correction lens configured to correct an image plane variation caused by a movement of the magnification varying lens, and (2) a storage unit storing first information that indicates a relation between a position of the magnification varying lens and a position of the correction lens for each object distance, the image pickup apparatus comprising:

• an image pickup element configured to perform photoelectric conversion of an object image formed by the image pickup optical system and output an image signal;
• a focus signal generator configured to generate a focus signal indicating a focus state of the image pickup optical system using the image signal;
• and
• an image pickup apparatus controller configured to control a communication with the lens unit and generate control information used for a vibration control that vibrates the correction lens and also moves a vibration center of the correction lens in a direction where the focus signal increases,
• wherein the image pickup apparatus controller receives information relating to the magnification varying operation, generates the control information in accordance with the information relating to the magnification varying operation, and sends the control information to the lens unit, and
• wherein when the magnification varying operation is performed, a first position of the correction lens is determined, by the lens unit, in accordance with the movement of the magnification varying lens based on the first information, and a moving amount of the correction lens is determined, by the lens unit, based on the control information and the first position of the correction lens.

A method of controlling a lens unit, the lens unit including (1) an image pickup optical system including a magnification varying lens configured to perform a magnification varying operation and a correction lens configured to correct an image plane variation caused by a movement of the magnification varying lens and (2) a storage unit storing first information that indicates a relation between a position of the magnification varying lens and a position of the correction lens for each object distance, the lens unit being configured to be removably mounted on an image pickup apparatus that generates a focus signal indicating a focus state of the image pickup system using an image signal and generates control information used for vibration control that vibrates the correction lens and also moves a vibration center of the correction lens in a direction where the focus signal increases, the method comprising the steps of:

• sending information relating to the magnification varying operation to the image pickup apparatus;
• receiving the control information from the image pickup apparatus;
• and
• controlling driving of the correction lens,
• wherein when the magnification varying operation is performed, a first position of the correction lens is determined in accordance with the movement of the magnification varying lens based on the first information, and a moving amount of the correction lens is determined based on the control information generated by the image pickup apparatus in accordance with the information relating to the magnification varying operation and the first position of the correction lens.

A method of controlling an image pickup apparatus on which a lens unit is capable of being removably mounted, the lens unit including (1) an image pickup optical system including a magnification varying lens configured to perform a magnification varying operation and a correction lens configured to correct an image plane variation caused by a movement of the magnification varying lens and (2) a storage unit storing first information that indicates a relation between a position of the magnification varying lens and a position of the correction lens for each object distance, the method comprising the steps of:

• generating a focus signal indicating a focus state of the image pickup optical system using an image signal;
• receiving information relating to the magnification varying operation from the lens unit;
• generating control information used for vibration control that vibrates the correction lens and also moves a vibration center of the correction lens in a direction where the focus signal increases in accordance with the information relating to the magnification varying operation;
• and
• sending the generated control information to the lens unit,
• wherein when the magnification varying operation is performed, a first position of the correction lens is determined in accordance with the movement of the magnification varying lens based on the first information, and a moving amount of the correction lens is determined based on the control information and the first position of the correction lens.