An image-capturing apparatus for controlling a drive system for an optical system corresponding to a position of an operation unit. The image-capturing apparatus includes a motor for driving a control target of the drive system, a driver for the motor, and position detecting means for detecting the position of the operation unit. A position generating means generates an output corresponding to the position of the operating unit within a limited range of movement by configuring an initialization value and maximum and minimum values of integrated displacement with respect to the output of the position detecting means. A controlling means controls the motor via the driver so as to drive the control target corresponding to the position generating output of the operating unit.
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