A photographing apparatus having a body portion to which a lens portion is mountable the photographing apparatus comprising: an image pickup device having pixels for image pickup and at least two types of pixels for focus detection for use in a pupil dividing phase difference method and to which an image forming luminous flux is conducted from the lens portion; a storage section configured to retain information of sensitivity characteristics indicative of light receiving sensitivity corresponding to ray incident angles on the two types of pixels for focus detection at a predetermined image height; and a control amount calculation section (26,28-30) configured to obtain information about incident angular ranges of the image forming luminous fluxes respectively incident on the two types of pixels for focus detection, from the lens portion, when mounted to the body portion to read the information stored in the storage section, to obtain, in accordance with the image heights of the two types of pixels for focus detection, centers of gravity of distributions of the light receiving sensitivity when the angular ranges based on the information about the angular ranges of the image forming luminous fluxes are set as the ray incident angles on the two types of pixels for focus detection, and to acquire information for focus control by a distance between the obtained centers of gravity; wherein the control amount calculation section (26,28-30) is configured to calculate a proportionality coefficient for converting phase difference detection information which is obtained based on outputs of the two types of pixels for focus detection into a defocus amount of the lens portion, characterized in that the control amount calculation section (26,28-30) is configured to calculate, in accordance with the image heights of the two types of pixels for focus detection, a correction value for correcting influence on outputs of the two types of pixels for focus detection by the illuminance distribution of the image forming flux based on a ratio of areas of the distributions of the light receiving sensitivity when the angular ranges based on the information about the angular ranges of the image forming luminous fluxes are set as the ray incident angles on the two types of pixels for focus detection. an image pickup device having pixels for image pickup and at least two types of pixels for focus detection for use in a pupil dividing phase difference method and to which an image forming luminous flux is conducted from the lens portion; a storage section configured to retain information of sensitivity characteristics indicative of light receiving sensitivity corresponding to ray incident angles on the two types of pixels for focus detection at a predetermined image height; and a control amount calculation section (26,28-30) configured to obtain information about incident angular ranges of the image forming luminous fluxes respectively incident on the two types of pixels for focus detection, from the lens portion, when mounted to the body portion to read the information stored in the storage section, to obtain, in accordance with the image heights of the two types of pixels for focus detection, centers of gravity of distributions of the light receiving sensitivity when the angular ranges based on the information about the angular ranges of the image forming luminous fluxes are set as the ray incident angles on the two types of pixels for focus detection, and to acquire information for focus control by a distance between the obtained centers of gravity; wherein the control amount calculation section (26,28-30) is configured to calculate a proportionality coefficient for converting phase difference detection information which is obtained based on outputs of the two types of pixels for focus detection into a defocus amount of the lens portion, characterized in that the control amount calculation section (26,28-30) is configured to calculate, in accordance with the image heights of the two types of pixels for focus detection, a correction value for correcting influence on outputs of the two types of pixels for focus detection by the illuminance distribution of the image forming flux based on a ratio of areas of the distributions of the light receiving sensitivity when the angular ranges based on the information about the angular ranges of the image forming luminous fluxes are set as the ray incident angles on the two types of pixels for focus detection.