JPH07281068A - Camera - Google Patents

Abstract

PURPOSE:To provide a camera which can allow zoom operation at installed time of a converting lens such as a wide attachment lens and can set an angle of view intended by a photographer. CONSTITUTION:A camera has a zoom lens 100 having a variable power lens 102 to perform variable power operation to change a focal distance within a first focal distance range and a focus compelling lens 105 to adjust a focus to adjust a focus adjusting position regulated by the variable power operation and a wide attachment lens 121 which can be mounted on and demounted from the zoom lens 100 and restricts a focus adjustable focal distance range of the zoom lens 100 to a second focal distance range from a first focal distance range at installing time of the zoom lens 100 and changes a magnifying rate. The variable power lens 102 is moved within an range corresponding to the first focal distance range and a range corresponding to the second focal distance range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with a zoom lens and a lens which is detachable from the zoom lens and which is used for changing the focal length of the zoom lens and its magnification.

[0002]

2. Description of the Related Art Conventionally, as a camera for converting a subject into an optical image and recording the optical image, a zoom lens and a zoom lens which can be attached to and detached from the zoom lens and which changes the focal length of the zoom lens and its enlargement ratio are attached. Some have a lens for.

Next, this zoom lens and a lens which can be attached to and detached from the zoom lens and which is used for changing the focal length of the zoom lens and the magnification thereof will be described with reference to the drawings. FIG. 4 is a configuration diagram showing a zoom lens mounted on a conventional camera and a lens for changing the focal length and the enlargement ratio of the mounted zoom lens.

The zoom lens 100, as shown in FIG. 4, has a first lens group 101 fixed to a housing. A second lens group (hereinafter referred to as a variable power lens) 102 for performing variable power is arranged behind the first lens group 101, and the variable power lens 102 serves as an optical axis of the first lens group 101. Have coincident optical axes. The variable-magnification lens 102 is moved in parallel with the optical axis of the variable-magnification lens 102 by a driving unit (not shown), and variable-magnification is performed by this movement.

A diaphragm 103 for adjusting the amount of light is arranged behind the variable power lens 102. Behind the aperture 103, a third lens group 104 fixed to the housing is provided.
Are arranged. The third lens group 104 has an optical axis that matches the optical axis of the variable power lens 102.

Behind the third lens group 104 is a fourth lens group (hereinafter referred to as a focus compensating lens) 10
5, the focus competition lens 105 has a focus adjustment function and a so-called competition function for correcting movement of the focal plane due to zooming. Focus competition lens 1
The optical axis of 05 coincides with the optical axis of the third lens group 104. The focus competition lens 105 is moved in parallel with the optical axis of the focus competition lens 105 by the driving means,
The focus adjustment function and the competition function are executed by this movement.

A CCD 106 is arranged behind the zoom lens 100, that is, behind the focus competition lens 105. An image pickup surface on which an optical image of a subject is formed is provided on a surface of the CCD 106 facing the focus compensating lens 105.

A wide attachment lens 121 for changing the focal length and the enlargement ratio is detachably attached to the zoom lens 100. When the wide attachment lens 121 is attached to the zoom lens 100, the wide attachment lens 121 is arranged in front of the first lens group 101 so that its optical axis matches the optical axis of the first lens group 101. .

Next, the focal length of the zoom lens 100 when the wide attachment lens 121 is not attached (the position of the variable magnification lens 102) and the focus competition lens 105.
The relationship with the position and the relationship between the focal length (the position of the variable magnification lens 102) and the position of the focus competition lens 105 at the time of mounting will be described with reference to the drawings. FIG. 5 is FIG.
Showing the relationship between the focal length (variable lens position) and the focus competition lens position of the zoom lens without the wide attachment lens attached, and the relationship between the focal length (variable lens position) and the focus competition lens position when mounted. Is.

First, the relationship between the focal length (variable lens 102) and the position of the focus competition lens 105 when the wide attachment lens 121 of the zoom lens 100 is not attached will be described.

When the focal length of the zoom lens 100 is set to a predetermined focal length, the position of the focus compensating lens 105 for forming an optical image on the image pickup surface of the CCD 106, that is, the focusing position of the focus compensating lens 105 is as shown in FIG. As shown in FIG. 5A, it changes according to the subject distance. Further, when the subject distance is constant, the focus position of the focus compensating lens 105 changes according to the focal length, that is, the position of the variable power lens 102. Therefore, a clear optical image can be obtained by moving the focus compensating lens 105 along a curve determined by the set focal length and subject distance.

Next, the relationship between the focal length (magnifying lens 102) and the position of the focus competition lens 105 when the wide attachment lens 121 of the zoom lens 100 is attached will be described.

When the focal length of the zoom lens 100 is set to a predetermined focal length, the focus position of the focus compensating lens 105 changes according to the subject distance, as shown in FIG. When the distance is constant, the focus position of the focus competition lens 105 changes according to the focal length, that is, the position of the variable power lens 102. However, as is clear from FIG. 5B, the curve showing the relationship between the focal length defined for each subject distance and the position of the focus competition lens 105 is a wide attachment lens 12.
Unlike the curve showing the relationship between the focal length defined for each subject distance and the position of the focus compensating lens 105 at the time of wearing No. 1, when the focal length exceeds the limit value 301, the focal length and focus defined for each subject distance are set. The curve showing the relationship with the position of the compensating lens 105 diverges outside the focusable area. Therefore, when the focal length is within the limit value 301, that is, when the focal length is set to a value on the wide end side, focus adjustment by the focus compensating lens 105 is possible, but the focal length is larger than the limit value 301. When the focal length is set to a value on the tele end side, the focus adjustment by the focus compensating lens 105 becomes impossible, and the variable magnification lens 102 is fixed at a position where the focal length is on the wide end side. The method is adopted, that is, the zoom operation is prohibited when the wide attachment lens 121 is attached.

[0014]

However, when the zoom operation is prohibited by mounting the wide attachment lens 121, the magnification of the zoom lens 100 in which the wide attachment lens 121 is mounted is fixed, so that the wide attachment lens 121 is mounted. At times, it is not possible to subtly change the angle of view by slightly changing the magnification, and the composition intended by the photographer cannot be created.

For example, if the magnification of the zoom lens 100 is set to 1 to 12 and the magnification of the zoom lens 100 when the wide attachment 121 is mounted is set to 0.7 to 1 times, the mounting of the wide attachment lens 121 is performed. Since the magnification is set to 0.7 times by prohibiting the zoom operation at the time, the magnification from 1 to 12 can be obtained by removing the wide attachment lens 121 from the zoom lens 100, but it is larger than 0.7 times. It is not possible to obtain an arbitrary magnification within the range from the magnification to 1 time.

An object of the present invention is to provide a camera capable of permitting a zoom operation when a conversion lens group such as a wide attachment lens is mounted and setting an angle of view intended by a photographer.

[0017]

According to a first aspect of the present invention, there is provided a variable power lens group for performing a variable power operation for changing the focal length within a first focal length range by parallel movement with respect to the optical axis, and the variable power lens. A zoom lens provided with a focus adjustment lens group for performing focus adjustment for adjusting a focus position defined by a zooming operation of the lens, and a conversion lens group detachable from the zoom lens. A conversion lens group for limiting the focusable focal length range of the zoom lens from the first focal length range to the second focal length range and changing the magnification when mounted on the camera. The moving of the variable power lens group for the variable power operation is performed in a range corresponding to the first focal length range and a range corresponding to the second focal length range.

According to a second aspect of the present invention, in the camera according to the first aspect, the moving range of the variable power lens group for the variable power operation is set to the first focal length range in accordance with attachment / detachment of the conversion lens group. Permission to select one of a range corresponding to the inside and a range corresponding to the second focal length, and permit movement of the zoom lens group for the zoom operation within the selected range. It is characterized by comprising means.

According to a third aspect of the present invention, in the camera according to the first aspect, the moving range of the variable power lens group for the variable power operation is set to the first focal length range in accordance with attachment / detachment of the conversion lens group. It is characterized by further comprising notifying means for selecting one of the range corresponding to the inside and the range corresponding to the second focal length and notifying the photographer of information indicating the selected range.

According to a fourth aspect of the present invention, in the camera according to the first aspect, the first focal length range and the second focal length range have a range portion overlapping each other.

[0021]

In the camera according to the first aspect, the movement of the variable power lens group for the variable power operation is performed in the range corresponding to the first focal length range and the range corresponding to the second focal length range.

According to the second aspect of the invention, the moving range of the variable power lens group for the variable power operation in accordance with attachment / detachment of the conversion lens group by the permitting means corresponds to the first focal length range and the second range. One of the ranges corresponding to the focal length is selected, and the movement of the variable power lens group for the variable power operation is permitted within the selected range.

In the camera according to the third aspect, the moving range of the variable power lens group for the variable power operation in response to the attachment / detachment of the conversion lens group by the notification means is the range corresponding to the first focal length range and the second range. One of the ranges corresponding to the focal length is selected, and the photographer is notified of information indicating the selected range.

According to another aspect of the present invention, the first focal length range and the second focal length range have a range portion overlapping each other.

[0025]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the camera of the present invention.

As shown in FIG. 1, the camera of this embodiment has a zoom lens 1 in which the focal length is adjusted within the first focal length range and the magnification is changed from 1 × to 12 ×.
00 is provided. The zoom lens 100 has a first lens group 101 fixed to a housing, as shown in FIG. A second lens group (hereinafter referred to as a variable power lens) 102 for performing variable power is arranged behind the first lens group 101, and the variable power lens 102 serves as an optical axis of the first lens group 101. Have coincident optical axes. The variable power lens 102 is moved by the variable power lens motor 116 in parallel with the optical axis of the variable power lens 102, and the variable power is performed by this movement. The variable power lens motor 116 is a stepping motor.

A diaphragm 103 for adjusting the amount of light is arranged behind the variable power lens 102. Behind the aperture 103, a third lens group 104 fixed to the housing is provided.
Are arranged. The third lens group 104 has an optical axis that matches the optical axis of the variable power lens 102.

Behind the third lens group 104, a fourth lens group (hereinafter referred to as a focus compensating lens) 10 is provided.
5, the focus competition lens 105 has a focus adjustment function and a so-called competition function for correcting movement of the focal plane due to zooming. Focus competition lens 1
The optical axis of 05 coincides with the optical axis of the third lens group 104. The focus competition lens 105 is moved by the focus competition lens motor 120 in parallel with the optical axis of the focus competition lens 105, and the movement performs the focus adjustment function and the competition function. The focus competition lens motor 120 is a stepping motor.

A CCD 106 is arranged behind the zoom lens 100, that is, behind the focus competition lens 105. An image pickup surface on which an optical image of a subject is formed is provided on a surface of the CCD 106 facing the focus compensating lens 105.

The CCD 106 converts the optical image formed on its image pickup surface into a video signal by photoelectric conversion, and this video signal is amplified by the amplifier 107 and then amplified by the camera signal processing circuit 108, AF evaluation value processing circuit 114 and It is given to the aperture control circuit 112.

The camera signal processing circuit 108 performs a predetermined process on the input video signal and then outputs it. The video signal from the camera signal processing circuit 108 is amplified by the amplifier 109.
After being amplified to a predetermined level by the LCD display circuit 1
Given to 10. The LCD display circuit 110 performs a predetermined process on the video signal and then outputs it to the LCD 111. The LCD 111 is composed of a liquid crystal display device, and this liquid crystal display device displays the image indicated by the image signal and the character indicating the photographing information from the character generator 126.

The aperture control circuit 112 generates a control signal for controlling the aperture of the aperture 103 according to the level of the input video signal. The control signal from the aperture control circuit 112 is given to the IG driver 113, and the IG driver 11
3 drives the IG meter 113a based on the control signal.
By driving the IG meter 113a, the aperture of the diaphragm 103 is adjusted to a predetermined value, and the light amount is adjusted.

The AF evaluation value processing circuit 114 extracts the high frequency component of the video signal in the distance measurement frame based on the gate signal from the frame generation circuit 116, and the AF indicating the degree of focusing based on the extracted high frequency component. Generate an evaluation signal.

A generated by the AF evaluation value processing circuit 114
The F evaluation signal is given to the AF microcomputer 115. AF
The microcomputer 115 takes in a detection signal from a wide attachment lens mounting detection switch 123 described later,
The variable magnification lens 1 based on the detection signal and the AF evaluation signal
A control signal for the movement of 02, a control signal for the movement of the focus compensating lens 105, and an instruction signal for instructing the change of the ranging frame are generated. A control signal for the movement of the variable magnification lens 102 is given to the variable magnification lens driver 117, a control signal for the movement of the focus competition lens 105 is given to the focus competition lens driver 119, and an instruction signal for instructing the change of the distance measurement frame is a frame. Generation circuit 11
Given to 6.

The scaling driver 117 is the AF microcomputer 11
The variable-magnification lens motor 116 is driven based on the control signal from 5, and the variable-magnification lens 102 is moved in the optical axis direction by driving the variable-magnification lens motor 116.

Focus lens competition driver 119
Drives the focus competition lens motor 120 on the basis of a control signal from the AF microcomputer 115, and the focus competition lens motor 120 is driven to move the focus competition lens 105 in the optical axis direction.

The AF microcomputer 115 is connected to a system controller (hereinafter, syscon) 124 so that they can communicate with each other. Syscon 124 is the zoom SW unit 1
25, the currently set focal length information of the zoom lens 100, the zoom direction at the time of zooming generated by the AF microcomputer 115, variable-magnification operation information such as the focal length, and the like are fetched, and the character generator 126 is controlled to perform zooming. Generate shooting information such as information. This shooting information is displayed on the LCD 111.

The zoom SW unit 125 outputs a voltage corresponding to the rotation angle of an operating member (not shown) for zooming the zoom lens 100 as the focal length information.

The focal length information, the zoom direction at the time of zooming generated by the AF microcomputer 115, and the variable-magnification operation information such as the focal length are mutually communicated between the system controller 124 and the AF microcomputer 115.

A wide attachment lens 121 for changing the focal length and magnification of the zoom lens 100 is detachably attached. When the wide attachment lens 121 is attached to the zoom lens,
The optical axis of the wide attachment lens 121 is the first.
Is arranged in front of the first lens group 101 so as to coincide with the optical axis of the lens group 101. When the wide attachment lens 121 is attached, the focal length range in which the zoom lens 100 can be focused is limited from the first focal length range to the second focal length range, and the enlargement ratio is 0.7 to 1 times.
The range is changed up to double.

The attachment / detachment of the wide attachment lens 121 to / from the zoom lens 100 is performed by the wide attachment lens slide mechanism 123. Whether or not the wide attachment lens slide 100 is attached is detected by the wide attachment lens attachment detection switch 123, and a detection signal indicating the result of this detection is detected by the AF microcomputer 1.
16 is output.

Next, the control operation of the camera in this embodiment will be described with reference to the drawings. FIG. 2 is a flowchart showing the control operation of the camera of FIG.

First, as shown in FIG. 2, initial setting is performed (step S201). In this initial setting, the RAM in the AF microcomputer 115 and various ports are processed.

Then, a communication processing routine is performed (step S202). In this communication processing routine, the focal length information from the zoom SW unit 125 between the AF microcomputer 115 and the system controller 115, the zoom direction at the time of zooming generated by the AF microcomputer 115, the variable magnification operation information such as the focal length, the wide attachment lens, etc. Information indicating whether or not 121 is attached, information indicating a zoom operation permission range that is changed according to whether or not the wide attachment lens 121 is attached, and the like are communicated with each other. The syscon 124 controls the character generator 126 based on each information, and the character indicating each information is displayed on the LCD 111.

After the communication processing routine is executed, the AF processing routine is executed (step S203). In this AF processing routine, processing for the AF evaluation signal and automatic focus adjustment based on the change in the AF evaluation signal are performed.

Then, a zoom processing routine is performed (step S204). This zoom processing routine will be described later in detail.

After the zoom processing routine is executed, a competition operation processing routine for performing a competition operation for maintaining the focus is executed in the variable power operation of the variable power lens 102 (step S205). In this competition operation processing routine, the drive direction and drive speed of the focus competition lens 105 are calculated along the curve shown in FIG.

Then, each mode selection routine is executed (step S206). In each of the mode selection processing routines, according to the AF mode (automatic focus adjustment mode), the zooming operation, and the like, the driving direction, the driving speed, and the focus competition of the zoom lens 102 calculated in steps S204 and S205. The use drive direction and drive speed are selected from the drive direction and drive speed of the lens 105.

After the execution of each mode selection routine, the motor drive routine is executed (step S207). In this motor drive routine, the selected variable power lens 1 described above is used.
02, a control signal for the variable power lens driver 117 and a control signal for the focus competition lens driver 119 are generated according to the driving direction and the driving speed of the focus competition lens 105 and the driving speed.
The drive stop of each variable power lens 102 and the focus competition lens 105 is controlled.

After the end of each mode selection routine, the processing from step S202 is executed again. The series of processes described above is executed in synchronization with the vertical synchronization period.

Next, variable magnification control of the camera of this embodiment will be described with reference to the drawings. FIG. 3 is a flow chart showing a zooming operation control in the camera of FIG.

When the zoom processing routine (step S204 shown in FIG. 2) is executed, first, as shown in FIG. 3, the zoom drive direction and the drive speed Zsp are calculated from the information of the zoom SW unit 126 obtained from the syscon 124 ( Step S301).

Next, the wide attachment lens 12
It is determined whether 1 is attached (step S302). When the wide attachment lens 121 is not attached, the W end movement completion flag is set to "0" (step S303), and it is determined whether or not the zoom operation is in progress (step S308).

During the zoom operation, it is determined whether or not the wide attachment lens 121 is attached (step S309). When the wide attachment lens 121 is attached, it is determined whether or not the position of the variable power lens 102 is within the movement permitted range when the wide attachment lens is attached (step S310). This movement permission range is a range corresponding to the second focal length range. When the position of the variable power lens 102 is within the movement permission range when the wide attachment lens is attached, it is determined whether the zoom direction is the wide direction (step S312).

If the zoom direction is the wide direction, the zoom drive direction bits are set as wide = 1 and tele = 0, and the drive direction is set to the wide direction (step S313).

When it is determined that the zoom direction is not the wide direction (step S312), the zoom drive direction bit is set as wide = 0, tele = 1 and the drive direction is set to the tele direction (step S314). .

If it is determined that the zoom operation is not being performed (step S308), or if it is determined that the position of the variable power lens 102 is not within the movement permission range when the wide attachment lens is attached (step S31).
0), the zoom drive direction bit is wide = 0, tele
= 0, and zoom driving is prohibited (step S315).

When it is determined that the wide attachment lens 121 is not attached (step S30)
9) Then, it is determined whether or not the position of the variable power lens 102 is within the movement permission range at the normal time (when the wide attachment is not attached) (step S311). This movement permission range is a range corresponding to the first focal length range. If the position of the variable power lens 102 is within the movement permitted range in the normal time, the process is executed from step S312.

On the other hand, if the position of the variable power lens 102 is not within the movement permission range in the normal state, the zoom drive direction bit is set as wide = 0, tele = 0,
Zoom driving is prohibited (step S315).

When it is determined that the wide attachment lens 121 is attached (step S30)
2), it is determined whether the W end movement completion flag is set to "1" (step S304). If the W end movement completion flag is set to "1", step S3 is performed.
The processing from 08 is executed.

On the other hand, the W end movement completion flag is "1".
If it is not set to, it is determined whether or not the position of the variable power lens 102 is at the wide end (step S30).
5). If the position of the variable power lens 102 is at the wide end, W
The end movement completion flag is set to "1" (step S30
7), step S315 is executed. Magnifying lens 10
If the position 2 is not at the wide end, the zoom drive speed Zsp is set to the maximum speed (step S306), and then (step S313) is executed.

Next, the driving of the zoom lens 100 based on the zoom driving bit (wide, tele) and the zoom driving speed Zsp will be described in detail.

First, the AF microcomputer 115 outputs a rotation frequency signal of the motor according to the zoom drive speed Zsp and a rotation direction signal of the motor according to the zoom drive bit to the variable magnification lens driver 117. Magnifying lens driver 1
Reference numeral 17 sets the phases of the four-phase motor excitation phases to forward rotation and reverse rotation based on the rotation direction signal, and changes the applied voltage (or current) of the four-phase motor excitation phase based on the frequency rotation signal. However, the rotation direction and the rotation frequency of the variable power lens motor 116 are controlled by outputting. By this control, the variable power lens motor 116 rotates and the variable power lens 102 is driven.

In this embodiment, the driving of the variable power lens 102 is described, but the focus competition lens 105 is also driven by the same method.

As described above, when the wide attachment lens 121 is attached, the movement of the variable magnification lens 121 is permitted within the range corresponding to the second focal length range. Therefore, the magnification when the wide attachment lens 121 is attached is 0.
It can be changed from 7 times to 1 time, and a delicate angle of view can be set. Further, by removing the wide attachment lens 121 from the zoom lens 100, a magnification of 1 to 12 can be obtained.
Therefore, an arbitrary magnification can be obtained within a continuous magnification range of 0.7 to 12 times, and the angle of view intended by the photographer can be set.

Further, the wide attachment lens 121
Since information indicating the zoom operation permission range, which is changed depending on whether or not the user is attached, is displayed on the LCD 111, the display allows the photographer to know the current zoom operation permission range, and the photographer's photographing in the zoom operation is performed. It is possible to prevent false recognition of the situation.

[0068]

As described above, according to the camera of claim 1, the movement of the variable power lens group for the variable power operation corresponds to the first focal length range and the second focal length. Since it is performed in the range corresponding to the range, it is possible to permit the zoom operation when the conversion lens such as the wide attachment lens is attached and set the angle of view intended by the photographer.

According to the second aspect of the present invention, the moving range of the variable power lens group for the variable power operation in accordance with the attachment / detachment of the conversion lens group by the permitting means is set within the range corresponding to the first focal length range. Either one is selected from the range corresponding to the second focal length, and movement of the variable power lens group for the variable power operation is permitted within the selected range. It is possible to prevent the double operation from being performed.

According to the camera of the third aspect, the moving range of the variable power lens group for the variable power operation according to the attachment / detachment of the conversion lens group by the notifying means is set within the range corresponding to the first focal length range. Since one of the ranges corresponding to the second focal length is selected and the information indicating the selected range is notified to the photographer, the erroneous recognition of the photographing situation of the photographer in the zooming operation can be prevented. Can be prevented.

According to the camera of the fourth aspect, since the first focal length range and the second focal length range have a range portion where they overlap each other, the magnification can be continuously changed, and a desired image can be obtained. The corners can be obtained more easily.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a facsimile apparatus which is a communication apparatus of the present invention.

FIG. 2 is a flowchart showing a control operation of the camera of FIG.

FIG. 3 is a flowchart showing a zooming operation control in the camera of FIG.

FIG. 4 is a configuration diagram showing a zoom lens mounted on a conventional camera and a lens for changing a focal length and a magnification of the zoom lens mounted on the camera.

5 shows the relationship between the focal length (variable lens position) and the position of the focus competition lens when the wide attachment lens of the zoom lens of FIG. 4 is not attached, and the focal length (variable lens position) and the focus competition lens when mounted. It is a figure which shows the relationship with a position.

[Explanation of symbols]

 100 Zoom Lens 102 Magnification Lens 105 Focus Compensation Lens 111 LCD 115 AF Microcomputer 116 Magnification Magnification Lens Motor 117 Magnification Magnification Lens Driver 119 Focus Compensation Lens Driver 120 Focus Compensation Lens Motor 121 Wide Attachment Lens 122 Wide Attachment Lens Slide Mechanism 123 Wide Attachment Lens Attachment detection switch 124 Syscon 125 Zoom SW unit 126 Character generator

Claims (4)

[Claims] 1. A variable power lens group for performing a variable power operation for changing a focal length within a first focal length range by a parallel movement with respect to an optical axis, and a focus defined by a variable power operation of the variable power lens. A zoom lens provided with a focus adjustment lens group for performing focus adjustment for adjusting a position, and a conversion lens group attachable to and detachable from the zoom lens when the zoom lens is attached to the zoom lens. A zoom lens for the zooming operation, comprising: a conversion lens group that limits a focusable focal length range from the first focal length range to the second focal length range and changes a magnification rate. A camera, wherein the group is moved in a range corresponding to the first focal length range and a range corresponding to the second focal length range. 2. A moving range of the variable power lens group for the variable power operation in accordance with attachment / detachment of the conversion lens group corresponds to a range corresponding to the first focal length range and a second focal length. 2. The camera according to claim 1, further comprising a permitting unit that selects one of the ranges to allow the movement of the variable power lens group for the variable power operation within the selected range. . 3. The moving range of the variable power lens group for the variable power operation corresponding to the attachment / detachment of the conversion lens group corresponds to the range corresponding to the first focal length range and the second focal length. The camera according to claim 1, further comprising a notifying unit that selects one of the ranges and notifies the photographer of information indicating the selected range. 4. The camera according to claim 1, wherein the first focal length range and the second focal length range have a range portion overlapping each other.