Image sensor and image capturing apparatus

An image sensor comprising a plurality of image sensing pixel groups, wherein:

• each of said plurality of image sensing pixel groups includes a plurality of pixels each having a plurality of photoelectric conversion portions divided by a separation band;
• the plurality of photoelectric conversion portions constituting each pixel included in each of said plurality of image sensing pixel groups have a function that photoelectrically converts a plurality of images formed by divided light fluxes of a light flux from an imaging optical system and outputs a focus detection signal that is used for phase difference detection;
• and
• said plurality of pixels comprising each of said plurality of image sensing pixel groups have photoelectric conversion portions that are divided in a plurality of different division patterns by the separation band.

An image sensor comprising a plurality of image sensing pixel groups, wherein:

• each of said plurality of image sensing pixel groups includes a plurality of pixels each having a plurality of photoelectric conversion portions that are divided by a separation band in at least one direction among a first direction and a second direction that is perpendicular to the first direction;
• the plurality of photoelectric conversion portions constituting each pixel included in each of said plurality of image sensing pixel groups have a function that photoelectrically converts a plurality of images formed by divided light fluxes of a light flux from an imaging optical system and outputs a focus detection signal that is used for phase difference detection;
• and
• the plurality of pixels comprising respective image sensing pixel groups adjacent in the first direction and in the second direction among said plurality of image sensing pixel groups have photoelectric conversion portions that are divided by the separation band in a plurality of division patterns that are different to each other.