| 主权项 |
1. An optical apparatus comprising:
an image-pickup optical system configured to form an optical image of an object, the image-pickup optical system including a variable-magnification lens configured to move in an optical axis direction and to change a focal length, and a focus lens configured to move in the optical axis direction for focusing and to correct a variation of an image plane associated with a magnification variation by the variable-magnification lens; a focus lens driver configured to drive the focus lens; and a controller configured to control the focus lens driver so as to maintain an in-focus state associated with the magnification variation, based on information on a tracking curve that represents a position of the focus lens corresponding to an object distance and the focal length of the image-pickup optical system, wherein the controller controls the focus lens driver so as to prevent the focus lens from being moved for focusing based on a difference between an actual position of the focus lens and the position of the focus lens indicated by the tracking curve in a case the focus lens driver is driving the focus lens based on the information on the tracking curve. |
