Camera and camera accessory

A camera accessory comprising:

• a mount;
• and
• an actuator configured to be driven to move an optical member,
• wherein a plurality of electrical contact surfaces including first, second and third electrical contact surfaces are disposed on the mount in a mount circumferential direction of the mount, and the first, second and third electrical contact surfaces are disposed in an order of the first, second, and third electrical contact surfaces,
• wherein the first and the second electrical contact surfaces, and the second and the third electrical contact surfaces are disposed adjacent to each other;
• wherein any electrical contact surfaces which contact to electrical contact pins disposed on a camera are not disposed between the first and second electrical contact surfaces, and the second and third electrical contact surfaces in the mount circumferential direction of the mount,
• wherein the first electrical contact surface is used to detect that the camera accessory is coupled to a camera,
• wherein the second electrical contact surface is for receiving electrical power from the coupled camera for communication, and
• wherein the third electrical contact surface is for receiving electrical power from the coupled camera for driving the actuator.

A camera comprising:

• a mount,
• wherein a plurality of electrical contact pins including first, second and third electrical contact pins are disposed on the mount in a mount circumferential direction of the mount, and the first, second and third electrical contact pins are disposed in an order of the first, second, and third electrical contact pins,
• wherein the first and second and the second and third electrical contact pins are disposed adjacent to each other;
• wherein any electrical contact pins are not disposed between the first and second electrical contact pins, and the second and third electrical contact pins in the mount circumferential direction of the mount,
• wherein the first electrical contact pin is used to detect that the camera accessory is coupled to the camera,
• wherein the second electrical contact pin is for supplying electrical power to the coupled camera accessory for communication, and
• wherein the third electrical contact pin is for supplying electrical power to the coupled camera accessory for driving an actuator of the camera accessory.