Image capturing apparatus, image capturing method, and storage medium

An image capturing apparatus comprising:

• an image sensor configured to output an image signal for generating an image and a focus detection signal for performing focus detection;
• and
• a controller configured to control a number of pixels used to output the image signal and the focus detection signal from the image sensor and a predetermined region for outputting the focus detection signal in the image sensor,
• wherein the controller, when successively acquiring first frames for recording from the image sensor, controls the number of pixels used to output the image signal and the focus detection signal from the image sensor in a second frame acquired between the successively acquired first frames, based on an image capturing condition, and
• the controller performs control so as to not record the second frame acquired between the successively acquired first frames if the second frame has a smaller number of pixels than the successively acquired first frames.

An image capturing apparatus comprising:

• an image sensor including a plurality of pixels, each pixel including a plurality of photoelectric conversion units that generate focus detection signals from light flux that have passed through different regions in an exit pupil in an optical system;
• and
• a processor and a memory which function as:
• an image capturing unit configured to continuously capture a plurality of images by using the image sensor, the image capturing unit being configured to acquire a signal in a first acquisition mode or a second acquisition mode for each pixel, the first acquisition mode being a mode in which an image signal obtained by adding the focus detection signals of the plurality of photoelectric conversion units is acquired, and the second acquisition mode being a mode in which the focus detection signals are acquired in addition to the image signal,
• wherein the image capturing unit is configured to alternately capture a recording image and a focus detection image having a smaller number of pixels than the recording image, apply all pixels to the first acquisition mode when capturing the recording image, and apply at least a part of the pixels to the second acquisition mode when capturing the focus detection image.