Imaging device, imaging method, and program

An imaging method executed by an imaging device provided with an imaging lens including a focus lens, and an imaging sensor that captures an optical image that has passed through the imaging lens, the imaging method comprising:

• acquiring a reference value of a change amount of image magnification in accordance with a change in position of the focus lens for each of a plurality of F-numbers;
• deriving a change amount of image magnification corresponding to each of the plurality of F-numbers in an autofocus area based on the acquired reference value of the change amount, in a case in which autofocus is executed;
• determining, as a limit F-number, an F-number corresponding to any change amount equal to or less than a threshold value of an allowed change amount of the image magnification among the derived change amounts;
• and
• setting an F-number as the limit F-number in a case in which an F-number obtained from a subject luminance in a case in which autofocus is executed exceeds the determined limit F-number.

A non-transitory computer-readable storage medium storing a program executable by a computer that controls an imaging device provided with an imaging lens including a focus lens, and an imaging sensor that captures an optical image that has passed through the imaging lens, to perform a process comprising:

• acquiring a reference value of a change amount of image magnification in accordance with a change in position of the focus lens for each of a plurality of F-numbers;
• deriving a change amount of image magnification corresponding to each of the plurality of F-numbers in an autofocus area based on the acquired reference value of the change amount, in a case in which autofocus is executed;
• determining, as a limit F-number, an F-number corresponding to any change amount equal to or less than a threshold value of an allowed change amount of the image magnification among the derived change amounts;
• and
• setting an F-number as the limit F-number in a case in which an F-number obtained from a subject luminance in a case in which autofocus is executed exceeds the determined limit F-number.