A control apparatus (125) includes an acquirer (125d) configured to acquire first information relating to a peak position of a spatial frequency that an image pickup optical system transmits for each spatial frequency, and a processor (125e, 125f, 125g) configured to calculate second information relating to a first evaluation band used for processing of image pickup signals and a second evaluation band used for processing of focus detection signals, the processor is configured to calculate third information relating to a weighting for each spatial frequency, and the processor is configured to calculate correction information of focus detection based on the first, second, and third information.