Lens control device and lens control method

1. A lens control device which controls lens devices provided in a 3D camera which takes a 3D image using a first lens device for 3D image taking and a second lens device which is made usable for 3D image taking when connected to the first lens device, comprising:

a lens particulars acquiring unit for acquiring respective zoom movable ranges of the first lens device and the second lens device and brightness controllable ranges at respective focal lengths of each of the zoom movable ranges;

a zoom range setting unit for setting a common zoom range of the first lens device and the second lens device on the basis of the acquired zoom movable ranges of the respective lens devices;

a brightness range setting unit for setting common brightness control ranges of the first lens device and the second lens device at respective focal lengths included in the common zoom range; and

a lens operation restricting unit for performing a control so that a zoom position signal corresponding to a target focal length of the first lens device included in the common zoom range and a brightness control signal corresponding to target brightness of the first lens device included in the common brightness control range at the target focal length are sent from the first lens device to the second lens device.

2. The lens control device according to claim 1 , wherein the lens control device is incorporated in the first lens device.

3. The lens control device according to claim 2 , wherein the lens particulars acquiring unit acquires a zoom movable range and a brightness controllable range of the second lens device from the second lens device through a communication.

4. The lens control device according to claim 1 , further comprising:

a connection detecting unit for detecting that the second lens device has been connected to the first lens device; and

a mode switching unit for switching, according to whether the second lens device is connected or not, between a first operation mode in which an operation control for 3D image taking which uses the first lens device and the second lens device is performed and a second operation mode in which an operation control for image taking which uses only the first lens device is performed,

wherein the mode switching unit makes switching from the second operation mode to the first operation mode if the connection detecting unit detects connection of the second lens device.

5. The lens control device according to claim 1 , wherein the lens operation restricting unit restricts the target brightness of the first lens device so that it comes to be included in the common brightness control range if it is out of the common brightness control range.

6. The lens control device according to claim 1 , wherein the brightness range setting unit makes a setting so that a brightness range that is lower than a prescribed brightness level is excluded from the common brightness control range.

7. The lens control device according to claim 1 , wherein the brightness range setting unit sets a common brightness control range using open f-numbers of the lens devices at each focal length.

8. The lens control device according to claim 7 , wherein the brightness range setting unit sets a common brightness control range using T-numbers of the lens devices at each focal length.

9. A lens control method for controlling the lens devices provided in a 3D camera which takes a 3D image using a first lens device for 3D image taking and a second lens device which is made usable for 3D image taking when connected to the first lens device, comprising:

acquiring respective zoom movable ranges of the first lens device and the second lens device and brightness controllable ranges at respective focal lengths of each of the zoom movable ranges;

setting a common zoom range of the first lens device and the second lens device on the basis of the acquired zoom movable ranges of the respective lens devices;

setting common brightness control ranges of the first lens device and the second lens device at respective focal lengths included in the common zoom range; and

performing a control so that a zoom position signal corresponding to a target focal length of the first lens device included in the common zoom range and a brightness control signal corresponding to target brightness of the first lens device included in the common brightness control range at the target focal length are sent from the first lens device to the second lens device.