Accessory apparatus, image-capturing apparatus, control apparatus, lens apparatus, control method, computer program and storage medium storing computer program

An accessory apparatus attachable to an image-capturing apparatus, the accessory apparatus comprising:

• an image-capturing optical system;
• and
• at least one processor or circuit configured to execute a plurality of tasks including:
• (1) a communicating task configured to perform communication with the image-capturing apparatus;
• and
• (2) a detecting task configured to detect first accessory information,
• wherein the communicating task is configured to receive (a) first time information corresponding to a first timing and (b) first ID information,
• wherein the plurality of tasks further comprises a calculating task configured to set a second timing based on the first time information,
• wherein the detecting task is configured to detect the first accessory information at a timing corresponding to the second timing, and
• wherein the communicating task is configured to transmit, to the image-capturing apparatus, the first accessory information and second ID information corresponding to a first angular velocity in relation to each other, the second ID information being identical to the first ID information.

A control method of controlling an image-capturing apparatus to which an accessory apparatus is attachable, the control method comprising the steps of:

• photoelectrically converting an object image formed through the accessory apparatus to output a first image signal;
• performing detection by using (a) the first image signal corresponding to a first timing, and (b) first accessory information received from the accessory apparatus;
• setting, based on the first timing, first time information;
• and
• performing communication with the accessory apparatus,
• wherein the step of performing communication transmits, to the accessory apparatus, (a) the first time information and (b) first ID information corresponding to the first image signal,
• wherein the step of performing communication receives (a) the first accessory information, which is detected by the accessory apparatus based on the first time information and (b) second ID information corresponding to a timing when the first accessory information is detected by the accessory apparatus, and
• wherein the detection is performed when the first ID information and the second ID information are identical to each other.

A control method of an accessory apparatus that is attachable to an image-capturing apparatus, and that includes an image-capturing optical system, the control method comprising the steps of:

• receiving (a) first time information corresponding to a first timing and (b) first ID information;
• setting a second timing based on the first time information;
• detecting first accessory information at a timing corresponding to the second timing;
• and
• transmitting, to the image-capturing apparatus, (a) the first accessory information and (b) second ID information corresponding to a first angular velocity in relation to each other, the second ID information being identical to the first ID information.