Image capturing apparatus, image capturing method and program

An image capturing method used by an image capturing apparatus, wherein

• the image capturing apparatus comprises:
• a light receiving section that receives light from an object;
• an optical system that passes the light from the object therethrough so as to cause the light receiving section to receive the light from the object, the optical system including an optical modulating section which causes an optical transfer function of the light from the object to remain substantially constant at a position where the light receiving section is provided on condition that an object distance of the object falls within a predetermined range in a direction parallel to an optical axis of the optical system;
• and
• a diaphragm section that blocks at least partially the light from the object to be received by the light receiving section, and
• the image capturing method comprises:
• detecting a quantity of the light from the object;
• and
• when the light quantity detected in the light quantity detecting is smaller than a predetermined light quantity, (i) setting an aperture size of the diaphragm section so as to be larger than a predetermined value and (ii) causing the light receiving section to receive the light from the object at least part of which is modulated by the optical modulating section.

A computer readable medium storing thereon a program for use with an image capturing apparatus, the image capturing apparatus comprises:

• a light receiving section that receives light from an object;
• an optical system that passes the light from the object therethrough so as to cause the light receiving section to receive the light from the object, the optical system including an optical modulating section which causes an optical transfer function of the light from the object to remain substantially constant at a position where the light receiving section is provided on condition that an object distance of the object falls within a predetermined range in a direction parallel to an optical axis of the optical system;
• and
• a diaphragm section that blocks at least partially the light from the object to be received by the light receiving section;
• wherein
• the program causes the image capturing apparatus to function as:
• a light quantity detecting section that detects a quantity of the light from the object;
• and
• an image capturing control section that, when the light quantity detected by the light quantity detecting section is smaller than a predetermined light quantity, (i) sets an aperture size of the diaphragm section so as to be larger than a predetermined value and (ii) causes the light receiving section to receive the light from the object at least part of which is modulated by the optical modulating section.