Lens apparatus, image pickup apparatus, control method for lens apparatus, and storage medium

A control method of a lens apparatus including a focus lens unit and a magnification-varying lens unit, the control method comprising the steps of:

• acquiring a detected position of the magnification-varying lens unit from a zoom position detector;
• and
• acquiring a predicted position based on the detected position of the magnification-varying lens unit,
• determining a target position of the focus lens unit according to a predicted position of the magnification-varying lens unit based on locus information indicating a relationship between a position of the magnification-varying lens unit and a position of the focus lens unit that is in focus at the position of the magnification-varying lens unit, and the detected position of the magnification-varying lens unit,
• determining the target position of the focus lens unit based on the locus information, the detected position of the magnification-varying lens unit, and the predicted position of the magnification-varying lens unit,
• acquiring speed information and acceleration information of the focus lens unit based on the locus information, the detected position of the magnification-varying lens unit, and the predicted position of the magnification-varying lens unit,
• correcting the predicted position of the magnification-varying lens unit based on the predicted position of the magnification-varying lens unit and the speed information and the acceleration information of the focus lens unit, and
• determining the target position of the focus lens unit based on a corrected predicted position.

A lens apparatus comprising:

• an optical system including a focus lens unit and a magnification-varying lens unit;
• and
• a processor configured to control driving of the focus lens unit,
• wherein the processor is configured to:
• acquire a detected position of the magnification-varying lens unit from a zoom position detector,
• acquire a predicted position based on the detected position of the magnification-varying lens unit,
• determine a target position of the focus lens unit according to the predicted position of the magnification-varying lens unit based on locus information indicating a relationship between a position of the magnification-varying lens unit and a position of the focus lens unit that is in focus at the position of the magnification-varying lens unit, and the detected position of the magnification-varying lens unit,
• determine the target position of the focus lens unit based on the locus information, the detected position of the magnification-varying lens unit, and the predicted position of the magnification-varying lens unit,
• determine the first target position of the first focus lens according to the predicted position of the magnification-varying lens unit based on the first locus information and the detected position of the magnification-varying lens unit, and
• determine the second target position of the second focus lens according to the predicted position of the magnification-varying lens unit based on the second locus information and the detected position of the magnification-varying lens unit,
• wherein the focus lens unit includes a first focus lens and a second focus lens that are drivable independently of each other,
• wherein the locus information includes first locus information indicating a relationship between the position of the magnification-varying lens unit and a position of the first focus lens that is in focus at the position of the magnification-varying lens unit, and second locus information indicating a relationship between the position of the magnification-varying lens unit and a position of the second focus lens that is in focus at the position of the magnification-varying lens unit, and
• wherein the target position includes a first target position of the first focus lens and a second target position of the second focus lens.