Image pickup apparatus and its control method

An image pickup apparatus comprising:

• an image sensor in which a plurality of pixels each having a plurality of photoelectric converters configured to photoelectrically convert light beams that have passed through mutually different pupil areas of an optical system are arranged in a plurality in a first direction, being a row direction, and a second direction, being a column direction;
• and
• a processor configured to:
• read out signals sequentially from the pixels of the image sensor row by row in the second direction,
• detect, based on the read-out signals, a first phase difference in the first direction and a second phase difference in the second direction,
• perform focus control based on a detection result of the processor,
• perform focus control based on the first phase difference when a shutter speed is shorter than a predetermined time,
• perform focus control based on both the first phase difference and the second phase difference when the shutter speed is longer than the predetermined time;
• and
• set the predetermined time to be longer when an F-number of the optical system is set to a second F-number larger than a first F-number.

A control method of an image pickup apparatus including an image sensor in which a plurality of pixels, each having a plurality of photoelectric converters configured to photoelectrically convert light beams that have passed through mutually different pupil areas of an optical system, are arranged in a plurality in a first direction, being a row direction, and a second direction, being a column direction, the control method comprising:

• a readout step of sequentially reading out signals from the pixels of the image sensor row by row in the second direction;
• a focus detection step of detecting, based on the read-out signals, a first phase difference that is a phase difference of a focus detection signal in the first direction and a second phase difference that is a phase difference of a focus detection signal in the second direction;
• and
• a focus adjustment step of performing focus control based on the first phase difference or the second phase difference,
• wherein the focus adjustment step includes:
• first processing in which focus control is performed based on the first phase difference is performed when a shutter speed is shorter than a predetermined time;
• and
• second processing in which focus control is performed by selecting one of focus control based on the first phase difference and focus control based on the second phase difference is performed when the shutter speed is longer than the predetermined time;
• and
• wherein the predetermined time is set to be longer when an F-number of the optical system is set to a second F-number larger than a first F-number.

A control method of an image pickup apparatus including an image sensor in which a plurality of pixels, each having a plurality of photoelectric converters configured to photoelectrically convert light beams that have passed through mutually different pupil areas of an optical system, are arranged in a plurality in a first direction, being a row direction, and a second direction, being a column direction, the control method comprising:

• a readout step of sequentially reading out signals from the pixels of the image sensor row by row in the second direction;
• a focus detection step of detecting, based on the read-out signals, a first phase difference that is a phase difference of a focus detection signal in the first direction and a second phase difference that is a phase difference of a focus detection signal in the second direction;
• and
• a focus adjustment step of performing focus control based on a detection result of the focus detection step,
• wherein the focus adjustment step includes:
• focus control is performed based on the first phase difference when a shutter speed is shorter than a predetermined time;
• focus control is performed based on both the first phase difference and the second phase difference when the shutter speed is longer than the predetermined time;
• and
• wherein the predetermined time is set to be longer when an F-number of the optical system is set to a second F-number larger than a first F-number.