Patent ID: 8503871

Claim:
An imaging system comprising: an imaging apparatus which is provided with an imaging device; and a mount adaptor which adjusts a flange focal length between the imaging apparatus and an interchangeable lens, wherein the mount adaptor is provided with a phase difference focus detection section which performs focus detection from a phase difference and an optical device which splits incident light from the interchangeable lens into incident light of the imaging device and incident light of the phase difference focus detection section, and the imaging apparatus is provided with a contrast focus detection section which performs focus detection from contrast using the imaging device, an adjustment section which adjusts a focus position of the phase difference focus detection section, and an adjustment control section which activates adjustment control of the focus position using detection of the mounting of the mount adaptor and the interchangeable lens, wherein the adjustment section performs adjustment of the focus position by resetting a remaining defocus amount which corresponds to the phase difference focus detection section in combination with focus detection using the contrast focus detection section and wherein the adjustment section acquires a contrast amount which is detected by the contrast focus detection section while a defocus amount is changed using the phase difference focus detection section and performs adjustment of the focus position with the defocus amount which corresponds to a peak value of the contrast amount as the remaining defocus amount.