A control apparatus controls an imaging apparatus that includes a focus detection unit configured to detect a focus state of an image forming optical system. The control apparatus includes a collectively setting unit configured to read initial setting values corresponding to a selected operation mode from a storage unit, and set setting values of a plurality of setting items to initial setting values, and a setting value changing unit configured to individually change setting values of the setting items set by the collectively setting unit and store the changed setting values in the storage unit. An operation of the focus detection unit is controlled by the operation mode in which the setting values have been changed by the setting value changing unit.