Patent ID: 9591243
Date: 2017-03-07
CPC Classifications: G02B,H04N

Claim:
1. A focus detecting apparatus which is capable of operating in a still image mode comprising: a first image sensor configured to receive a light beam that has passed through an optical system and to output a first signal pair having parallax to be used for a focus detection by a phase difference detection method; a second image sensor configured to receive, by a masking device, a light beam narrower than that received by the first image sensor, which has passed through the optical system and to output a second signal pair having parallax to be used for the focus detection by the phase difference detection method; and at least one processor or circuitry which functions as: a calculating unit configured to calculate the focus detection by the phase difference detection method, wherein, in the focus detection calculation of the still image mode, a range used to detect a shift amount corresponding to a high matching degree between image signals consisting of the first signal pair is wider than a range used to detect a shift amount corresponding to a high matching degree between image signals consisting of the second signal pair.