Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit transmits data via the first data communication channel in response to having received a transmission request signal via the notification channel, and selectively adds, to the data, a communication standby request for keeping a transmission request signal from being transmitted from the imaging apparatus to the accessory device.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit transmits data via the first data communication channel in response to having received a transmission request signal via the notification channel, and selectively adds, to the data, a communication standby request for keeping a transmission request signal from being transmitted from the imaging apparatus to the accessory device.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit executes switching of communication methods while notifying the imaging apparatus of a communication standby request for keeping data communication from the imaging apparatus to the accessory device from being performed, via the notification channel.

Abstract: A camera includes a camera controller that provides, using the data communication channel, a first communication for performing a data communication with the plurality of accessory apparatuses, and a second communication for performing a data communication individually with a specific accessory apparatus designated as a communication counterpart by the first communication, output a signal for instructing switching from the first communication to the second communication to the signal transmission channel, performs the first communication at a first communication rate commonly usable for the camera and the plurality of accessory apparatuses, and performs the second communication at a second communication rate commonly usable for the camera and the specific accessory apparatus and equal to or higher than the first communication rate.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit transmits data via the first data communication channel in response to having received a transmission request signal via the notification channel, and selectively adds, to the data, a communication standby request for keeping a transmission request signal from being transmitted from the imaging apparatus to the accessory device.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit transmits data via the first data communication channel in response to having received a transmission request signal via the notification channel, and selectively adds, to the data, a communication standby request for keeping a transmission request signal from being transmitted from the imaging apparatus to the accessory device.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit executes switching of communication methods while notifying the imaging apparatus of a communication standby request for keeping data communication from the imaging apparatus to the accessory device from being performed, via the notification channel.

Abstract: An image capturing apparatus sends to the lens apparatus command registration information indicative of a combination and a transmission order of a plurality of lens data to be transmitted from the lens apparatus to the image capturing apparatus, and requests the lens apparatus to continuously transmit the plurality of lens data in the transmission order based on the command registration information. The lens apparatus registers the command registration information in response to the command registration information received from the image capturing apparatus, and continuously transmits the plurality of lens data to the image capturing apparatus in the transmission order based on the command registration information in response to a transmission request command corresponding to the command registration information received from the image capturing apparatus.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit executes switching of communication methods while notifying the imaging apparatus of a communication standby request for keeping data communication from the imaging apparatus to the accessory device from being performed, via the notification channel.

Abstract: A camera includes a camera controller that provides, using the data communication channel, a first communication for performing a data communication with the plurality of accessory apparatuses, and a second communication for performing a data communication individually with a specific accessory apparatus designated as a communication counterpart by the first communication, output a signal for instructing switching from the first communication to the second communication to the signal transmission channel, performs the first communication at a first communication rate commonly usable for the camera and the plurality of accessory apparatuses, and performs the second communication at a second communication rate commonly usable for the camera and the specific accessory apparatus and equal to or higher than the first communication rate.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit transmits data via the first data communication channel in response to having received a transmission request signal via the notification channel, and selectively adds, to the data, a communication standby request for keeping a transmission request signal from being transmitted from the imaging apparatus to the accessory device.

Abstract: An imaging apparatus that provides, between itself and an accessory device, a notification channel used for notification from the imaging apparatus to the accessory device, a first data communication channel used in data transmission from the accessory device to the imaging apparatus, and a second data communication channel used in data transmission from the imaging apparatus to the accessory device. An accessory control unit executes switching of communication methods while notifying the imaging apparatus of a communication standby request for keeping data communication from the imaging apparatus to the accessory device from being performed, via the notification channel.

Abstract: An image capturing apparatus sends to the lens apparatus command registration information indicative of a combination and a transmission order of a plurality of lens data to be transmitted from the lens apparatus to the image capturing apparatus, and requests the lens apparatus to continuously transmit the plurality of lens data in the transmission order based on the command registration information. The lens apparatus registers the command registration information in response to the command registration information received from the image capturing apparatus, and continuously transmits the plurality of lens data to the image capturing apparatus in the transmission order based on the command registration information in response to a transmission request command corresponding to the command registration information received from the image capturing apparatus.

Abstract: An image pickup system includes a lens apparatus, and an image pickup apparatus to which the lens apparatus is detachably attached. The image pickup apparatus controller changes a cycle of a control reference signal for internal processing of the image pickup apparatus, and sends a command of changing the cycle of the control reference signal to the lens controller in synchronization with a post-change control reference signal. The lens controller that has received the command changes the cycle of the control reference signal when the lens apparatus is ready to change the cycle of the control reference signal, and sends to the image pickup apparatus controller information representing whether the lens controller has been able to follow the change of the cycle of the control reference signal.

Abstract: The optical apparatus including a motor to move an optical element, a position detector configured to detect a position of the optical element, a controller configured to control drive of the motor by using a position detection signal from the position detector, and a memory configured to store a reference movement amount of the optical element corresponding to a moving speed and a moving time period of the optical element moved by the motor. The controller is configured to acquire a correction value for reducing a difference between (a) an actual movement amount of the optical element obtained by using the position detection signal when the optical element is moved by the motor and (b) the reference movement amount, and then to control the drive of the motor by using the correction value.

Abstract: An optical apparatus includes a controller configured to control driving of a focus lens in manual focusing. A moving speed of the focus lens is expressed by a function of an operating speed of the operating unit, and the controller generates a control signal for the driver in accordance with the function. When the operating speed of the operating unit is equal to or lower than a threshold, the function is such a linear function that the moving speed of the focus lens linearly increases as the operating speed of the operating unit increases. When the operating speed of the operating unit is higher than the threshold, a differential value of the function increases as the operating speed of the operating unit increases. The function is continuous and smooth at the threshold.

Abstract: An image pickup system includes a lens apparatus, and an image pickup apparatus to which the lens apparatus is detachably attached. The image pickup apparatus controller changes a cycle of a control reference signal for internal processing of the image pickup apparatus, and sends a command of changing the cycle of the control reference signal to the lens controller in synchronization with a post-change control reference signal. The lens controller that has received the command changes the cycle of the control reference signal when the lens apparatus is ready to change the cycle of the control reference signal, and sends to the image pickup apparatus controller information representing whether the lens controller has been able to follow the change of the cycle of the control reference signal.

Abstract: A drive controlling apparatus includes a driver configured to apply driving signals configured to excite a plurality of windings in a stepping motor, and a controller configured to acquire a detection result of excitation currents in the windings, and to provide a feedback control over the driving signals so that a difference can be reduced between a first time difference and a second time difference, the first time difference being a period from a first reference time set in an excitation current waveform of the winding corresponding to a first drive channel to a time at which a set current value is provided, and the second time difference being a period from a second reference time corresponding to the first reference time and set in the excitation current waveform of the winding corresponding to the second drive channel to a time at which the set current value is provided.

Abstract: The optical apparatus including a motor to move an optical element, a position detector configured to detect a position of the optical element, a controller configured to control drive of the motor by using a position detection signal from the position detector, and a memory configured to store a reference movement amount of the optical element corresponding to a moving speed and a moving time period of the optical element moved by the motor. The controller is configured to acquire a correction value for reducing a difference between (a) an actual movement amount of the optical element obtained by using the position detection signal when the optical element is moved by the motor and (b) the reference movement amount, and then to control the drive of the motor by using the correction value.

Abstract: At least one exemplary embodiment is directed to an image pickup apparatus that has an external sensor for detecting brightness separately from an image sensor for obtaining an image pickup signal and controls the insertion and removal of a filter into and from an image pickup optical system in accordance with the brightness of the subject, using brightness information obtained from the external sensor and the image pickup signal.