Lens apparatus for controlling an initial value
Provided is a lens apparatus in which serial communication and parallel communication between a camera body and the lens apparatus are performed and resumption of the serial communication is accomplished after occurrence of a communication error, and controlling of a controlled object being controlled through the parallel communication is transferred to temporally controlling through the serial communication, in which, by setting a state of the controlled object when the controlling is transferred to controlling through the serial communication, to be coincident with a state during controlling through the parallel communication, the controlled object to be controlled through the parallel communication is not affected by an effect caused due to a communication error in the serial communication.
1. A lens apparatus removably attached to a camera body and including an optical system for forming an object image on an image sensing element of the camera body, comprising:
a parallel control device which controls a predetermined controlled object based on a control signal provided by the camera body through parallel communication, and
a serial control device which controls the controlled object based on a control signal provided by the camera body through serial communication, wherein when the controlled object is controlled by the parallel control device, once the serial communication is started, the controlled object is set to a predetermined initial value for the case where the controlled object is controlled by the serial control device, and subsequently, the controlling is shifted to controlling of the parallel control device,
the lens apparatus further comprising:
an initial value changing device which changes an initial value based on the control signal provided through the parallel communication, when the controlled object is controlled by the parallel control device, wherein the initial value is changed without changing a state of the controlled object, even if, at the start of the serial communication, the controlled object is set to a predetermined initial value for the case where the controlled object is controlled by the serial control device.
2. The lens apparatus according to claim 1 , wherein
the controlled object is a diaphragm of the imaging optical system.