JP5645486B2 - Camera system and lens unit and camera unit used therefor - Google Patents

Description

The present invention relates to a camera system having a camera unit and a lens unit that can be attached to and detached from the camera unit, and a lens unit and a camera unit used therefor, in particular, a video camera capable of smoothly communicating various types of information between them. It is suitable for a digital camera or the like.

2. Description of the Related Art Conventionally, a plurality of television systems (video systems) such as NTSC, PAL, and SECAM have been used for color video systems in optical devices such as video cameras and TV cameras depending on the region. These video system signal processing is not compatible. For this reason, it is necessary to make a video camera using a video system adapted to each. In an interchangeable lens video camera, the lens (lens unit) side also needs to change the optical control due to the difference in frame rate due to the difference in the television system.

A camera system that avoids this difference in video format is known (Patent Document 1). In Patent Document 1, a difference in frame rate that greatly affects optical control is determined, and control according to each frame rate is performed. Thus, a camera system for an interchangeable lens that can be connected to any format camera is disclosed.

On the other hand, in recent years, many video cameras corresponding to a variable frame rate have been proposed. For example, cameras that can perform 24P shooting at the same frame rate as films used in movies and the like and high-speed shooting higher than 60 Hz have been proposed, and the frame rates are becoming diverse. Then, by outputting the video shot at high speed as a signal with a normal playback frame rate of 60 Hz or 50 Hz, an effect like slow playback is obtained during playback. In addition, imaging devices such as a method of creating a wide dynamic range image by superimposing a plurality of images as a single picture, or a method for image stabilization by combining a plurality of image positions and combining them are known. (Patent Document 2).

  As described above, the imaging cycle is shifting from the conventional fixed cycle to the variable cycle, and high-speed imaging can be performed by the development of the imaging device and the image processing IC. Traditionally, the imaging cycle and the frame rate of the video signal output were the same, but the frequency of the imaging cycle and the video output signal is also increasing due to slow motion, wide dynamic range, image stabilization, etc. .

JP-A-2-210312 JP-A-5-7336

In a video camera or the like when the imaging period and the video signal output of the frequency (frame rate over G) are different arises for the reasons described above. For such a situation, in the conventional camera systems it did not consider that the imaging cycle is changed. For this reason, when the range of the imaging cycle that can be handled by the interchangeable lens is unknown, an inappropriate operation may occur if this lens is attached to the camera unit.

The relative traditional interchangeable lens, if the from the camera unit side will send optical control signal corresponding to the high speed frame rate over bets can not perform normal operation arises. That is, since the interchangeable lens does not take into consideration that the imaging cycle changes , it is difficult to perform various optical controls with an optimal imaging cycle. In recent years, there are many cases where the frame rate of the video signal and the imaging cycle are not the same.

The present invention, by communicating the information about the imaging cycle for each optical control between the lens unit and the camera unit, the range of adaptable imaging cycle of the camera unit and the lens unit can perform the optimum control even when different An object is to provide a camera system , a lens unit used for the camera system, and a camera unit .

The camera system according to the present invention is a camera system having a camera unit and a lens unit that can be attached to and detached from the camera unit, wherein the camera unit has camera communication means and imaging means , and the lens unit is lens communication means. And an optical control means for changing the optical characteristics of the lens unit based on information obtained from the imaging means , and the camera communication means and the lens communication means communicate via electrical contacts. , Information on the maximum communication frequency on the lens unit side, which is the maximum frequency at which the lens communication means can communicate, and information on the maximum optical control frequency, which is the maximum frequency that can be controlled by the optical control means, Information regarding the maximum communication frequency on the camera unit side, which is the maximum frequency at which the camera communication means can communicate, The imaging means communicates information relating to the maximum imaging frequency, which is the maximum frequency that can be imaged, and the camera communication means and the lens communication means communicate the maximum communication frequency on the lens unit side and the maximum communication on the camera unit side. Of the frequencies, communication is performed at a frequency equal to or lower than the smaller frequency, the maximum imaging frequency is higher than the maximum optical control frequency, and the optical control means is an optical control frequency having a frequency equal to or lower than the maximum optical control frequency. The optical characteristic of the lens unit is controlled, and the imaging unit performs imaging at a frequency higher than the optical control frequency .

The lens unit according to the present invention is a lens unit that can be attached to and detached from a camera unit having a camera communication unit and an image pickup unit, and the optical characteristics of the lens unit based on information obtained from the lens communication unit and the image pickup unit. The lens communication means is the maximum value of the frequency at which the camera communication means can communicate with information relating to the maximum optical control frequency, which is the maximum value via an electrical contact. , Information on the maximum communication frequency on the camera unit side and information on the maximum imaging frequency, which is a maximum value of the frequency that can be imaged by the imaging unit, and the lens communication unit is configured to communicate with the maximum communication frequency on the lens unit side. The maximum communication frequency on the camera unit side is communicated with the camera communication means at a frequency equal to or lower than the smaller frequency, Maximum optical control frequency is less than the maximum imaging frequency, the optical control means, and controlling the optical characteristics of the lens unit at frequencies below the maximum optical control frequency.

The camera unit according to the present invention includes a camera communication unit and an imaging unit, and the lens unit is detachable. The lens unit is based on the lens communication unit and information obtained from the imaging unit. An optical control means for changing the optical characteristics of the lens unit, and the camera communication means communicates with the lens communication means via an electrical contact, and the maximum frequency at which the lens communication means can communicate is established. Information on the maximum communication frequency on the lens unit side, which is a value, information on the maximum optical control frequency which is the maximum value of the frequency which can be controlled by the optical control unit, and the maximum value of the frequency which can be communicated by the camera communication unit Information on the maximum communication frequency on the camera unit side and the maximum imaging frequency that is the maximum frequency that can be imaged by the imaging means The camera communication means communicates with the lens communication means at a frequency equal to or lower than the smaller one of the maximum communication frequency on the lens unit side and the maximum communication frequency on the camera unit side, The maximum imaging frequency is higher than the maximum optical control frequency, and the imaging unit performs imaging at a frequency equal to or lower than the maximum imaging frequency .

According to the present invention , a camera capable of performing optimum control even when the range of communicable frequencies between the camera unit and the lens unit is different by communicating information about the communicable frequency between the lens unit and the camera unit. A system is obtained.

Block diagram of the camera system of the present invention Communication method diagram between camera unit and lens unit The figure showing the communication between the camera unit and lens unit of this invention Communication sequence diagram between camera unit and lens unit of the present invention Flow chart of the camera system of the present invention Explanatory drawing of AF at the time of high speed control according to the present invention and conventional AF

Hereinafter, to describe the embodiments of the present invention with reference to the drawings.
[Example 1]
FIG. 1 is a block diagram of a main part of a first embodiment in which the camera system (photographing system) of the present invention is used in an interchangeable lens video camera. This photographing system roughly includes a lens unit 123 and a camera unit 124. Both units can be freely attached / detached via a mount having electrical contacts.

  Light from a subject incident on the photographing optical system of the lens unit 123 passes through a VAP (Vari Angle Prism) 101 that performs image stabilization, a fixed lens 102, a zoom unit (variator lens) 103 that performs zooming, and a light amount adjustment. Passes through the aperture 104. Thereafter, the image passes through a shutter 105 for taking a still image, a fixed lens 106, and a focus lens (compensator lens) 107 for focusing, and forms an image on an image sensor 108 such as a CCD.

  The video signal converted into an electronic signal by the image sensor 108 is sent to the signal processing device 109. Signals such as signal amplification are processed to create a digital video signal, and image processing such as color correction and white balance is performed and converted into an appropriate video signal (video signal data), and the video signal is output to the recording processing device 110 Is done. Also, the video signal data is sent from the signal processing device 109 to the lens control data calculation device 117 to generate signals (AE signal, AF signal, vector signal) necessary for lens control for auto exposure, auto focus, motion vector, etc. To do.

  The AE signal is generated by integrating the luminance signal for one screen or a specific area, and creating evaluation value data for evaluating how far the luminance is from the proper exposure state. The AF signal is obtained by using one or a plurality of high-frequency signal integration values obtained by integrating the luminance signal for one screen or a specific area by integrating the amount of high-frequency components extracted by the high-pass filter in the lens control data calculation device 117. can get. The lens control data calculation device 117 generates an AF signal that determines whether or not the subject is in focus. In general, a high-frequency integral value is high for an image near the focus. On the other hand, a blurred image out of focus has a low high-frequency integration value. From this, the in-focus determination of the photographing lens is determined using the high-frequency integral value. This method is called contrast AF. Also, the vector signal calculates where the subject in each screen has moved compared to the previous image for one screen or one specific area before, and is determined to be the movement of the entire screen. The amount of motion is determined and a vector signal is generated. The lens control data is calculated in this way, and the calculated lens control data is sent to the camera microcomputer 120.

The camera microcomputer 120 detects the direction and amount of the zoom switch 111, the direction and amount of the focus operation switch 118, and the state of the shutter switch 121 by the camera microcomputer 120, and creates operation information for the lens. In addition, the imaging switch of the camera unit 124 is selected under the restriction described later by the dial switch 122 for changing the imaging cycle of the imaging device.

On the other hand, the camera microcomputer 120 has communication means (camera communication means) that communicates with the lens unit 123 at a predetermined frequency (a predetermined cycle) such as 60 Hz or 50 Hz via an electrical contact. Then, lens control data, operation information, and information indicating the camera state are sent from the camera unit 124. The lens unit 123 has a communication means for mutually communicating data necessary to each other, such as a lens state (photographing state) (lens communication unit).

  The lens microcomputer 119 moves various parts based on various lens control data and operation information received from the camera microcomputer 120. The focus lens 107 is driven by a focus lens driving device 116, the shutter is driven by a shutter driving device 115, and the aperture 104 is driven by an aperture driving device 114. The zoom unit 103 is driven by a command signal from the zoom lens driving device 113. The driving of the VAP 101 is driven by a command signal from the VAP driving device 112. These members perform basic operations as a camera system.

  The above-described communication between the camera unit 124 and the lens unit 123 is a clock synchronous serial controlled by four lines as shown in FIG. 2 by the lens communication means in the lens microcomputer 119 and the camera communication means in the camera microcomputer 120. It is done by communication. The CS signal is set to the Low state from the camera unit 124 side, the start of communication is notified to the lens unit 123 side, and the communication data from the camera unit 124 is transmitted in units of several blocks every 1 byte.

At that time, in order to synchronize the communication timing of the camera and the lens, the communication is performed in synchronization with the clock signal . The lens unit 123 side receives the CTL signal containing communication data from the camera unit 124 to the lens unit 123. At the same time, communication data from the lens unit 123 to the camera unit 124 is transmitted as an LTC signal in units of several blocks every 1 Byte in synchronization with the clock signal. For example AE for the above-mentioned lens control, AF, etc. vector signal data is sent to the lens unit 123 side to place each data in the CTL signal. Also, zoom, focus, shutter operation information, etc. are arranged in the CTL signal and sent to the lens unit 123 side.

And a communication period and imaging period information described later is also sent by the CTL signal. And lens control cycle information from the lens unit 123, data such as the lens status is also transmitted more to the camera unit 124 side in the LTC signal. As a result, data is exchanged between the lens unit 123 and the camera unit 124 .

FIG. 3 shows the timing of communication between the camera unit and the lens unit and the timing of lens control , which are written at the intervals of the imaging cycle of the imaging device. FIG. 3 (A) shows a communication between a conventional camera unit and a conventional lens unit, the processing time relationships. In FIG. 3A, communication is performed in synchronization with an imaging cycle of 60 Hz, and then lens control is performed. In the case of a camera unit and a lens unit that are made assuming an imaging cycle of 60 Hz, the operation is performed without any inconvenience.

FIG. 3B shows a relationship between communication and processing time between a camera unit that supports high-speed imaging and a lens unit that does not support high-speed imaging . As shown in FIG. 3 (B), the as the camera unit side performs imaging at a frequency of four times the 240Hz of 60 Hz, communicates with the lens unit in synchronism with the imaging cycle. Then, the lens unit receives information from the camera unit, and the next communication timing is reached before the control in the lens unit is completed. As a result, control in the lens unit and communication between the camera unit and the lens unit cannot be performed normally.

FIG. 3 (C) shows a communication with the processing time of the relationship between the lens unit corresponding to the camera unit and the high-speed imaging for high-speed imaging. If possible camera unit and the lens unit corresponding to the imaging at a frequency of 240Hz as shown in FIG. 3 (C), the it is possible to perform lens control corresponding to any inconvenience without high-speed shooting.

FIG. 3 (D) shows a communication with the processing time of the relationship between the lens unit that is not compatible with the camera unit and the high-speed imaging for high-speed imaging. As shown in FIG. 3 (D), the conventional lens unit that does not support high-speed imaging, when connected to the camera unit for high-speed imaging, by communicating with the imaging period of the traditional 60 Hz, The lens unit operates normally . At this time , the imaging cycle may be shortened . In this embodiment, in consideration of the fact that there is often no need to improve the response of the lens so much, the transmission cycle of the signal for controlling the lens and the imaging cycle are set to different cycles. In FIG. 3D, a lens unit that does not support high-speed shooting is connected to a camera unit that supports high- speed shooting by performing communication and lens control between the lens unit and the camera unit at an old cycle. also to work normally.

Figure 4 is an illustration of a communication sequence of the camera unit and the lens unit in the camera system of the present invention. First, the camera unit and the lens unit perform initial communication for transmitting and receiving mutual initial data. In the initial communication, information on the maximum frequency value that can be communicated on the camera unit side is transmitted from the camera unit side. In the figure , information indicating 240 Hz is transmitted . Also , the maximum value of the imaging frequency that can be captured by the camera unit is transmitted . In the figure , information indicating 240 Hz is transmitted . On the lens unit side, the maximum value of the frequency that can be communicated on the camera unit side and the maximum value of the imaging frequency that can be captured by the camera unit are received from the camera unit side . Then, information indicating 240 Hz is transmitted as the maximum frequency that can be communicated on the lens unit side. Also, information regarding the maximum value of the optical control frequency that can be controlled by the lens unit is transmitted.

Here, the optical control means of the lens unit performs control with focus control, aperture control, image stabilization control, zoom control, and shutter control as control targets. And each control can be performed with the frequency below the maximum value of the frequency (optical control frequency) which can control each control object. From the lens unit to the camera unit, information indicating that AF control is 240 Hz, AE control is 60 Hz, IS control is 240 Hz, shutter operation is 30 Hz, zoom operation, and focus operation is 240 Hz is transmitted to the camera unit side. .

The above initial communication needs to be performed at a predetermined communication speed. Moreover, it is an appropriate frequency including compatibility to perform at 60 Hz or 50 Hz, which is supported by the old lens unit or the like.

In this way, the maximum frequency information that can be communicated with each other in the initial communication is transmitted and received , and control communication is performed at a frequency at which the camera unit and the lens unit can communicate based on the information. Here, since the maximum communication frequency with which the lens unit and the camera unit can communicate is the same , communication can be performed at high speed by performing communication at the maximum frequency of 240 Hz.

  In control communication, frequency data for actual AF, luminance for AE, luminance difference information, vector information used for low frequency operation of IS operation, and the like are transmitted. Also, a command determined from an operation member on the camera unit side, such as a zoom operation command, a focus operation command, and a vibration control command, is transmitted.

The transmission / reception of the control information regarding the control target performed between the lens unit and the camera unit will be described. First, control information is transmitted from the lens unit side at a frequency equal to or lower than the maximum value of the frequency (optical control frequency) that can control each control target. The lens unit receives control communication data from the camera unit and controls various operations at designated frequencies . Specifically , the AF operation is controlled at 240 Hz, the AE operation at 60 Hz, the IS vector operation at 240 Hz, and the shutter operation at 30 Hz. By the lens unit side is controlled communication from the camera unit side, receives the control information for each control object performs control based thereon. Then, in the next control communication , the control result is transmitted to the camera unit side.

Figure 5 is a flow chart illustrating a series of flow in the camera system of the present invention. First, initial communication is performed between the camera unit and the lens unit, the maximum imaging frequency that the camera unit can image, the maximum frequency that can be communicated on the lens unit side, the maximum imaging frequency that the camera unit can image, Information on the maximum value of the optical control frequency that can be controlled by the lens unit is transmitted and received .

Details are as described above. Next, when the maximum frequency that can be communicated on the lens unit side is indefinite (if it is unknown), for example, when the predetermined byte is 0x00 , the maximum frequency that can be communicated on the lens unit side is determined to be undefined (unknown). Then, the process proceeds to S503. Then, the maximum communication frequency on the camera unit side is set to 60 Hz if it is Japan, and 50 Hz if it is a European camera unit, and the process proceeds to S507. On the other hand , if the maximum frequency that can be communicated on the lens unit side is determined in S502 , the maximum imaging frequency that can be captured by the camera unit on the camera unit side is compared with the maximum frequency that can be communicated on the lens unit side. (S504). When the maximum imaging frequency that can be captured by the camera unit is smaller than the maximum frequency that can be communicated on the lens unit side, the maximum imaging frequency that can be captured by the camera unit is set as the maximum communication frequency ( S505). When the maximum frequency that can be communicated on the lens unit side is smaller than the maximum imaging frequency that can be captured by the camera unit, the maximum frequency that can be communicated on the lens unit side is set as the maximum communication frequency (S506). , the process proceeds to S507, performs a control communication with a maximum value of the set communication frequency.

Then, necessary data is exchanged with each other by control communication, and after the communication is completed, the lens unit side performs various controls as described above. This control communication is repeated in S507 to repeat the lens unit and camera unit control until the power is turned off in S508. If the power is turned off, the power is turned off after performing a predetermined end operation (S509) .

In the following, the predetermined frequency is 60 Hz, but may be 50 Hz. When the camera communication means can perform communication at a speed higher than 60 Hz, and the communication information sent from the lens communication means does not include the maximum value of the communication frequency that can be communicated with the lens unit , the camera The communication means communicates with the lens communication means at a frequency of 60 Hz or less.

Alternatively, when the imaging unit of the camera unit can capture an image at an imaging frequency faster than 60 Hz, the communication information sent from the lens communication unit includes the maximum value of the optical control cycle that can be controlled by the lens unit. If not , the imaging means of the camera unit controls the lens unit via communication at a frequency of 60 Hz or less.

Alternatively, when the lens communication means can perform communication at a speed higher than 60 Hz, and the communication information sent from the camera communication means does not include the maximum value of the communication frequency that can be communicated with the camera unit. The lens communication means communicates with the camera communication means at a frequency of 60 Hz.

Alternatively, when the lens communication means can perform control at a speed higher than 60 Hz, and the communication information sent from the camera communication means does not include the maximum value of the imaging frequency with which the camera unit can communicate The lens communication means communicates with the camera communication means at a frequency of 60 Hz .

  FIG. 6 is an explanatory diagram of AF (automatic focus detection) and conventional AF during high-speed control. An AF signal is sent from the camera unit side to the lens unit side at every imaging cycle by control communication from the camera unit. This AF signal is used for AF by measuring the contrast of the luminance signal at several representative frequencies with respect to the video imaged by the image sensor.

In general, the AF signal increases as it approaches the focus position, and the AF signal decreases as the distance from the focus position increases. An AF operation is performed using this AF signal. In the AF operation, the focus lens is driven to a close distance and a telephoto side by a minute distance, and the direction in which the focus position is located is determined. By repeating this operation, a focused state can be obtained.

FIG. 6A shows the case where the imaging frequency is 60 Hz, and an operation of driving and stopping a minute distance on the close side and driving and stopping a minute distance on the infinite side are performed. Compare the contrast value of the AF signal when stopping at the close side and the infinite side, determine that the focus position is in the direction where the value is large , and increase the focus lens in the direction where the focus position is determined Drive. When the imaging frequency is 60 Hz, 1 x 60 sec, the driving is performed. FIG. 6B shows a case where the imaging frequency is 240 Hz, and the driving is performed four times in the same 60 seconds. In the present embodiment , among the control objects, the largest optical control frequency maximum value is frequency information for AF control. Thus, in interchangeable camera system lens, the imaging frequency is large camera system, it is possible to achieve high-speed AF by mounting the lens unit corresponding to the high-speed imaging.

The same applies to the AE operation, IS vector operation, zoom operation, and focus operation. If the imaging cycle is high, more AE signal data, vector signal data, zoom data, and focus data can be referred to per second. Fine lens control can be performed. As for the shutter , a series of operations from the aperture backlash removal operation, the shutter operation start, the shutter closing operation, and the shutter opening operation is completed .

If the old lens unit does not support high-speed operation, the same shooting as before can be performed by reducing the imaging frequency to 60 Hz or less. The imaging cycle on the camera unit side is kept at a high speed, and only the communication cycle is set to 60 Hz or less in accordance with the lens unit. Then, the camera unit can integrate the AE signal and vector signal or calculate the average value and send it to the communication data with a communication period of 60 Hz or less, so that more precise lens control suitable for the lens can be performed. As described above, according to the present embodiment, the information about the frequency that can be communicated between the lens unit and the camera unit is optimally communicated even when the range of the communicable frequency between the camera unit and the lens unit is different. Control can be performed .

108 Image sensor 112 VAP drive device 113 Zoom lens drive device 114 Aperture drive device 115 Shutter drive device 116 Focus lens drive device 119 Lens microcomputer 120 Camera microcomputer 123 Lens unit 124 Camera unit

Claims (6)

A camera system having a camera unit and a lens unit detachable from the camera unit,
The camera unit has camera communication means and imaging means,
The lens unit has lens communication means and optical control means for changing the optical characteristics of the lens unit based on information obtained from the imaging means,
The camera communication unit and the lens communication unit communicate with each other through an electrical contact, and information on the maximum communication frequency on the lens unit side, which is the maximum frequency that the lens communication unit can communicate with, and the optical Information on the maximum optical control frequency that is the maximum value of the frequency that can be controlled by the control means, information on the maximum communication frequency on the camera unit side that is the maximum value of the frequency that can be communicated by the camera communication means, and the imaging means Communicates information about the maximum imaging frequency, which is the maximum frequency that can be imaged,
The camera communication means and the lens communication means communicate at a frequency equal to or lower than the smaller one of the maximum communication frequency on the lens unit side and the maximum communication frequency on the camera unit side,
The maximum imaging frequency is greater than the maximum optical control frequency;
The optical control means controls optical characteristics of the lens unit at an optical control frequency that is equal to or lower than the maximum optical control frequency, and the imaging means performs imaging at a frequency higher than the optical control frequency. Camera system.   Information communicated in the initial communication when the camera communication unit and the lens communication unit perform initial communication at a predetermined frequency, and the camera communication unit can perform communication at a frequency higher than the predetermined frequency. The camera communication means and the lens communication means communicate at a frequency equal to or lower than the predetermined frequency when the maximum communication frequency on the lens unit side is not included. Camera system.   Information communicated in the initial communication when the camera communication unit and the lens communication unit perform initial communication at a predetermined frequency, and the lens communication unit can perform communication at a frequency higher than the predetermined frequency. The lens communication unit and the camera communication unit perform communication at a frequency equal to or lower than the predetermined frequency when the maximum communication frequency on the camera unit side is not included. Camera system.   The camera system according to claim 2, wherein the predetermined frequency is 50 Hz or 60 Hz. A lens unit that can be attached to and detached from a camera unit having a camera communication unit and an imaging unit, and has a lens communication unit and an optical control unit that changes optical characteristics of the lens unit based on information obtained from the imaging unit. And
The lens communication means communicates with the camera communication means via an electrical contact, and information on the maximum communication frequency on the lens unit side, which is the maximum value of the frequency with which the lens communication means can communicate, and the optical Information on the maximum optical control frequency that is the maximum value of the frequency that can be controlled by the control means, information on the maximum communication frequency on the camera unit side that is the maximum value of the frequency that can be communicated by the camera communication means, and the imaging means Communicates information about the maximum imaging frequency, which is the maximum frequency that can be imaged,
The lens communication means communicates with the camera communication means at a frequency equal to or lower than the smaller one of the maximum communication frequency on the lens unit side and the maximum communication frequency on the camera unit side,
The maximum optical control frequency is smaller than the maximum imaging frequency;
The lens unit , wherein the optical control means controls the optical characteristics of the lens unit at a frequency equal to or lower than the maximum optical control frequency. A camera unit having a camera communication means and an imaging means, wherein the lens unit is removable;
The lens unit includes a lens communication unit and an optical control unit that changes an optical characteristic of the lens unit based on information obtained from the imaging unit.
The camera communication means communicates with the lens communication means via an electrical contact, and information on the maximum communication frequency on the lens unit side, which is the maximum value of the frequency with which the lens communication means can communicate, and the optical Information on the maximum optical control frequency that is the maximum value of the frequency that can be controlled by the control means, information on the maximum communication frequency on the camera unit side that is the maximum value of the frequency that can be communicated by the camera communication means, and the imaging means Communicates information about the maximum imaging frequency, which is the maximum frequency that can be imaged,
The camera communication means communicates with the lens communication means at a frequency equal to or lower than the smaller one of the maximum communication frequency on the lens unit side and the maximum communication frequency on the camera unit side,
The maximum imaging frequency is greater than the maximum optical control frequency;
The camera unit, wherein the imaging unit performs imaging at a frequency equal to or lower than the maximum imaging frequency .