Lens device

1. A lens device which is connected to another lens device having an operating mode used as a stand-alone mode and a slave operating mode that is operated in response to a control signal input from an external device and is used in association with said another lens device, the lens device comprising:

a setting unit that sets the lens device as a master, with respect to at least one control object for which the lens device is associated with said another lens device; and

a control unit that drives the control object of the lens device in response to the control signal input to the lens device, and transmits a control signal for driving the control object of said another lens device to said another lens device, with respect to the control object for which the master is set in the setting unit,

wherein the control unit transmits, to said another lens device, a mode switching signal only with respect to the control object for which the master is set in the setting unit, to instruct to said another lens device to switch the operation mode with respect to the control object from the operation mode used as the stand-alone mode to the slave operation mode that is operated in response to the control signal input by the lens device.

2. The lens device of claim 1 , wherein the setting unit is a switch provided on the lens device.

3. The lens device of claim 1 , further comprising:

a detecting unit that detects the external device for operating the control object for which the lens device is associated with said another lens device is connected to the lens device,

wherein the setting unit sets the lens device as the master, with respect to the control object controlled by at least the external device, when the detecting unit detects the connection of the external device.

4. The lens device of claim 1 , wherein a plurality of control objects for which the lens device is associated with said another lens device is provided, and

the setting unit collectively sets the lens device as the master with respect to all of the control objects.

5. The lens device of claim 1 , wherein the lens device includes

a first operating mode used as the stand-alone mode and a second operating mode used in association with said another lens device, and

a mode switching unit that switches between the first operating mode and the second operating mode.

6. The lens device of claim 5 , wherein the control object for which the lens device is associated with said another lens device includes a zoom,

in the first operation mode, the control unit drives the zoom of the lens device by speed control, and

in the second operation mode, when the master is set for the zoom, the control unit drives the zoom of the lens device by position control and transmits to said another lens device, the control signal for driving the zoom of said another lens device by the position control, and when the master is not set for the zoom, the control unit drives the zoom based on the control signal input to the lens device.

7. The lens device of claim 1 , wherein the slave operating mode is operated in response to the control signal input from said another lens device, and

the control unit cancels the control signal other than the control signal input from said another lens device, among the control signal input to the lens device, in a case where the mode switching signal which instructs to switch to the slave operating mode is input from said another lens device, with respect to the control object for which the master is not set.

8. The lens device of claim 1 , wherein the lens device further includes a dip switch, and when the dip switch is off, the operating mode is set to the stand-alone mode.

9. The lens device of claim 8 , wherein the lens device is connected to said another lens device with a cable, and when a connection between the lens device and said another lens device is not detected, the operating mode is set to the stand-alone mode regardless of the state of the dip switch.