Image capturing apparatus, method of controlling same, and storage medium

An image capturing apparatus, comprising:

• an image sensor having phase difference detection pixels for performing focus detection;
• and
• at least one processor or circuit configured to function as the following units:
• an exposure control unit configured to cause at least the phase difference detection pixels to perform a plurality of accumulations whose exposure periods are a second exposure period shorter than a first exposure period which is a target for obtaining a main image by the image sensor;
• a comparison unit configured to compare a length of the first exposure period with a threshold;
• and
• a prediction unit configured to, based on a result of comparison by the comparison unit, select one of a signal obtained by accumulation over the first exposure period and a signal obtained by accumulation over the second exposure period, and predict an in-focus position of a subject.

A method of controlling an image capturing apparatus provided with an image sensor having phase difference detection pixels for performing focus detection, the method comprising:

• causing at least the phase difference detection pixels to perform a plurality of accumulations whose exposure periods are a second exposure period shorter than a first exposure period which is a target for obtaining a main image by the image sensor;
• comparing a length of the first exposure period with a threshold;
• and
• based on a result of the comparison, selecting one of a signal obtained by accumulation over the first exposure period and a signal obtained by accumulation over the second exposure period, and predicting an in-focus position of a subject.

A non-transitory computer readable storage medium storing a program for causing a computer to execute steps of a method of controlling an image capturing apparatus comprising an image sensor having phase difference detection pixels for performing focus detection, the method comprising:

• causing at least the phase difference detection pixels to perform a plurality of accumulations whose exposure periods are a second exposure period shorter than a first exposure period which is a target for obtaining a main image by the image sensor;
• comparing a length of the first exposure period with a threshold;
• and
• based on a result of the comparison, selecting one of a signal obtained by accumulation over the first exposure period and a signal obtained by accumulation over the second exposure period, and predicting an in-focus position of a subject.