Camera, lens unit, and image-pickup system

A lens unit that is attachable to and detachable from a camera, the lens unit comprising:

• a lens communication unit configured to communicate with the camera;
• and
• a lens controller configured to control the lens communication unit,
• wherein the lens communication unit is configured to change a voltage applied to a communication terminal used for a communication with the camera, and
• wherein the lens communication unit is configured to communicate with the camera using one of a first communication mode and a second communication mode, the first communication mode enabling the communication with the camera using a communication method of a first communication speed, the second communication mode enabling the communication with the camera using a communication method of a second communication speed faster than the first communication speed, the first communication mode setting the voltage applied to the communication terminal to a first range, and the second communication mode setting the voltage applied to the communication terminal to a second range that is located on a lower voltage side than the first range.

An image-pickup system comprising a lens unit, and a camera to which the lens unit is detachably attached, the camera including a camera communication unit configured to communicate with the lens unit, and a camera controller configured to control the camera communication unit, the lens unit including a lens communication unit configured to communicate with the camera, and a lens controller configured to control the lens communication unit,

• wherein the camera communication unit is configured to change a voltage applied to a first communication terminal used for a communication with the lens unit,
• wherein the camera communication unit is configured to communicate with the lens unit using one of a first communication mode and a second communication mode, the first communication mode setting the voltage applied to the communication terminal to a first range and enabling the communication with the lens unit using a communication method of a first communication speed, and the second communication mode setting the voltage applied to the communication terminal to a second range that is located on a lower side than the first range and enabling the communication with the lens unit using a communication method of a second communication speed higher than the first communication speed,
• wherein the lens communication unit is configured to change a voltage applied to a communication terminal used for a second communication with the camera, and
• wherein the lens communication unit is configured to set the voltage applied to the second communication terminal to the first range, and the second communication mode sets the voltage applied to the communication terminal to the second range.