Patent ID: 8259215

Claim:
An image-pickup apparatus comprising: an image pickup element configured to include image pickup pixels for photoelectrically converting an object image formed by a light flux from an image pickup optical system and focus detection pixels for photoelectrically converting two images formed by first light fluxes which are two divided light fluxes from the image pickup optical system; a first focus information calculating part configured to calculate first focus information indicating a focus state of the image pickup optical system based on outputs from the focus detection pixels; a light-receiving element provided separately from the image pickup element and configured to photoelectrically convert two images formed by second light fluxes which are two divided light fluxes from the image pickup optical system; a second focus information calculating part configured to calculate second focus information indicating a focus state of the image pickup optical system based on an output from the light-receiving element; a correction value calculating part configured to calculate a correction value based on the first focus information and the second focus information; a controlling part configured to perform focus control of the image pickup optical system based on the second focus information corrected using the correction value; a display element; and an optical viewfinder, wherein the apparatus is switchable between a first mode for introducing the light flux from the image pickup optical system to the image pickup element and displaying on the display element a viewfinder image generated using outputs from the image pickup element and a second mode for guiding the light flux from the image pickup optical system to the optical viewfinder, and wherein the correction value calculating part calculates the correction value after each switching between the first mode and the second mode.