JP3076575B2 - Camera auto zoom bracketing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic zoom bracketing device that automatically performs photographing at a plurality of focal lengths in a camera equipped with a variable focal length photographing lens.

"Prior art and its problems" When photographing with a camera equipped with a zoom lens (including a multifocal lens such as a bifocal lens), the photographer first determines the composition, and then determines framing by a zooming operation. I was shooting.

However, humans have the property that, when they stare at a part, only that part appears to be emphasized, and the surrounding part becomes difficult to see. For this reason, there has often been a problem that the framing and drawing intention set while viewing the image in the viewfinder during photographing are different from the framing and drawing intention when the user actually looks at the printed print or the like.

[Object of the Invention] The present invention has been made in view of the above-mentioned problems in photographing using a conventional zoom lens, and has an automatic zoom bracket of a camera capable of photographing at arbitrary plural focal lengths desired by a photographer. It is an object to provide a pointing device.

SUMMARY OF THE INVENTION The present invention that achieves the above object is an auto-bracketing apparatus that performs photographing while changing the focal length of a photographing lens whose focal length can be changed, and sets a plurality of focal lengths to be photographed by the photographing lens. Focal length setting means,
A focal length changing unit for sequentially changing the focal length of the photographing lens to a plurality of focal lengths set by the focal length setting unit; and an exposure device for exposing for each focal length changed by the focal length changing unit. The focal length setting means, the number of photographing setting means to set the number of photographing, according to the number of photographing set by the number of photographing setting means, divided the changeable focal length range of the photographing lens, And a dividing means for determining a focal length for photographing.

According to the automatic zoom bracketing device of the camera, the photographer can set the number of times of photographing or the focal length in advance, so that photographing can be performed in accordance with the photographer's drawing intention.

"Examples of the Invention" The present invention will be described below based on illustrated examples. FIG. 1 is a circuit diagram of a control system of a single-lens reflex camera reflex camera provided with a zoom lens 11 to which the automatic zoom bracketing device of the present invention is applied. Before describing the present control system, an outline of the configuration of the zoom lens 11 will be described with reference to FIG.

Zoom lens as focal length variable shooting lens
11 includes a variable focal length lens group L1, L2 as is well known,
Zooming is performed by moving these focal length variable lenses relative distances. The variable focal length lenses L1 and L2 are linked with the zoom lens barrel 13 via a cam mechanism, and are moved relative distances by the rotation of the zoom lens barrel 13. The zoom lens barrel 13 is driven to rotate by a zoom motor 19 via a reduction gear train 17.

The focal length of the zoom lens 11 is read by a focal length reader. The focal length reading device of the present embodiment includes a code plate 21 provided on the surface of the zoom lens barrel 13,
The reading brush 23 includes contact pieces 23a to 23c that slide independently of the three codes 21a to 21c of the code plate 21, respectively.

The cords 21a to 21c are formed of a conductive material, provided on the surface of the insulating material, and grounded. These codes 21a-21c
Are the wide part (conductive part) and the narrow part (insulating part)
The focal length at the position where the reading brush 23 slides is coded by the combination of the wide portion and the narrow portion.

On the other hand, the tip of each of the contact pieces 23a to 23c of the reading brush 23 is formed to have a width which is in sliding contact with the wide portion of each of the codes 21a to 21c, but is not in sliding contact with the narrow portion. Therefore, the contact pieces 23a to 23c that come into contact with the wide portion are at the low level, and the contact pieces that come into contact with the narrow portion are at the high level. That is, the lens CPU 25 checks the level of each of the contact pieces 23a to 23c and converts the combination of the levels into focal length information stored in advance to obtain the current focal length f _now . In addition,
Other known focal length readers may be applied.

Furthermore, the mount of the zoom lens 11 has a lens contact 29
a to 29e are provided. These lens contacts 29a-29e
Is connected to the lens CPU 25. Hand camera body 3
The first mount is provided with body contacts 53a to 53e that connect to the lens contacts when the lens is mounted (see FIG. 1). The lens CPU 25 and the main CPU 33 mounted on the camera body 31 communicate with each other via the lens contacts 29a to 29e and the body contacts 53a to 53e.

Next, the configuration of the control system of the camera will be described. A lens CPU 25 mounted on the zoom lens 11 drives a zoom motor 19 via a motor driver 27 to control zooming. The above lens CPU 25, motor driver 27
The zoom motor 19 constitutes a focal length changing unit.

The internal RAM of the lens CPU 25 stores information on the minimum aperture value A _vmin , the maximum aperture value A _vmax , the longest focal length f _max , the shortest focal length f _min , the type of the zoom lens 11, and the like.

The reading brush 23 is connected to the input ports P1 to P5 of the lens CPU 25.
Are connected to each other. Therefore, the level of the code plate 21 with which the contact piece has contacted is output to the input ports P1 to P5. The lens CPU 25 inputs the levels of the input ports P1 to P5 and converts them into corresponding focal length information. That is, the lens CPU 25 has the input ports P1 to P
Get the current focal length f _now from 5 levels.

In addition, port V _DD and input / output port of lens CPU25 ▲
▼, ▲ ▼ and SIO each have 2 lens contacts
9b and lens contacts 29c, 29d, 29e.
Further, a lens contact 29a is connected to the motor driver 27.

On the other hand, the camera body 31 is equipped with a main CPU 33 that controls the overall operation of the camera. Main CPU33
Has a photometric circuit 35, an exposure circuit 37, a motor drive circuit 39
And the display 41 are connected.

The photometric circuit 35 subjects the subject light signal output from the light receiving element 43 to logarithmic compression and A / D conversion, and then outputs the signal to the main CPU 33. The main CPU 33 determines the aperture value A _v based on the film sensitivity S _v information and the subject brightness B _v information output from the photometric circuit 35.
Then, the shutter speed _Tv is calculated, and the exposure circuit 37 is activated based on these to expose the film. When the exposure is completed, the film winding motor 45 is started via the motor drive circuit 39 to wind the film by one frame.

The display 41 is provided on the upper surface of the camera body 31 as shown in FIG. 3, and displays auto-zoom bracketing information 41a in addition to normal shooting information such as an exposure mode and the number of films.

The regulators 47 and 49 supply the electric power of the battery 51 to each electronic member of the camera body 31 and the contacts 53a, 53b, 29.
The power is supplied to each electronic member of the zoom lens 11 via a and 29b.

Data communication is performed between the main CPU 33 of the camera body 31 and the lens CPU 25 of the zoom lens 11 via body contacts 53c, 53d, 53e and lens contacts 29c, 29d, 29e provided on the mount. With this communication, the lens CP
Lens information is sent from U25 to the main CPU 33, and a zooming signal is sent from the main CPU 33 to the lens CPU 25.

In addition, the input ports of the main CPU 33 include photometric switches SWS, release switches SWR, mode switches SWMD, drive switches SWDR, and up switches SW as switches.
UP and down switch SWDN are connected.

The photometry switch and the release switch are linked to the release button 55 shown in FIG. Release button
When the shutter button 55 is half-pressed, the photometric switch SWS is turned on to perform photometric processing, and when the shutter button is fully pressed, the release switch SWR is turned on to perform exposure processing.

The mode switch SWMD and the drive switch SWDR are linked to the mode / drive lever 57, and are selectively turned on by the mode / drive lever 57. The up switch SWUP and the down switch SWDN are linked with the select lever 59, and are selectively turned on by the select lever 59.

The drive switch SWDR changes the release mode in cooperation with the up switch SWUP and the down switch SWDN. In the present embodiment, when the up switch SWUP is turned on while the drive switch SWDR is on, the mode is in the up direction, that is, from the single release mode to the continuous release mode, the auto zoom bracketing mode, the self-timer mode, the single It changes cyclically in the order of the release mode (see FIG. 4). On the other hand, when the down switch SWDN is turned on, the mode circulates and changes in the down direction opposite to the above.

The mode switch SWMD changes an exposure mode such as a program exposure, a manual exposure, and a shutter priority automatic exposure in cooperation with an up switch SWUP and a down switch SWDN.

Next, the operation of setting the auto zoom bracketing and the number of photographing times will be described with reference to the flowchart of FIG. This operation is executed by the main CPU33.

When the drive switch SWDR is turned on, this software is called and the up switch SWUP and down switch SW
Check whether the DN is on (S11, S1
2). Here, if the up switch SWUP is on, the drive mode up process is executed (S13). If the down switch SWDN is on, the drive mode down process is executed (S14). To return.

When the drive mode up / down processing is completed, it is checked whether the drive mode set by this processing is an auto zoom bracketing mode (hereinafter referred to as “AZB mode”), and if different, the processing returns (S1).
Five).

If the mode is the AZB mode, the process enters the number-of-photographs setting process. In the number-of-photographs setting process, first, 2 is set as initial data in the number-of-photographs counter n, and it is checked which of the up switch SWUP and the down switch SWDN is on (S17, S21).

If the up switch SWUP is on, the number-of-photographs counter n is incremented by one, and it is checked whether the number-of-photographs counter n has reached 32 or more. If it is not 32 or more, the process proceeds to S25, and if it is 32 or more, 32 is set in the number-of-times-of-imaging counter n and the process proceeds to S25 (S20). That is,
The maximum number of times of photographing in this embodiment is 32. It should be noted that a warning may be issued if the set number of times of photography exceeds the number of remaining films.

On the other hand, when the down switch SWDN is on,
The number-of-photographs counter n is decremented by one (S22).
Then, it is checked whether or not the number-of-times-of-shooting counter n is 2 or more. If it is not 2 or more, 2 is set. If it is 2 or more, the process directly proceeds to S25.

Up switch SWUP and down switch SWDN
If both are off, the process jumps from S21 to S25.

In S25, the display 41 displays the number of times of photography on the display 41 and blinks. Then, it is checked whether or not the photometry switch SWS is on (S26). If it is on, the number of shots n is set in the RAM of the main CPU 33 and the process returns. If it is not on, the process returns to S17 (S26). The photographing number setting process and the photometric switch SWS check process are repeated.

Next, the main operation of the camera will be described with reference to the main flowchart of the camera shown in FIGS. 6A to 6C. When the photometric switch SWS is turned on, this flowchart starts. First, the main CPU 33 executes the initialization of each port and the initialization of the ram (S31, S3).
2) The port PH is set to "1", and 47 and 49 are kept on (S33).

Next, set the CPU communication code to “0” and set the lens CPU
Communication with the zoom lens 11 from the lens CPU 25.
Aperture value information, focal length information (current focal length f _now , shortest focal length f _min and longest focal length f _max ), lens type information and macro information are read (S34). Next, the photometric circuit 3
5 by turning the type the subject luminance B _v, calculates the exposure value E _v is running based on the light measuring operation of this with the film sensitivity S _v (S35).

Then, it is checked whether the mode is the AZB mode, the zoom lens, or the macro range (S36, S3
7, S38). If it is not the AZB mode, the process proceeds to step S39 because it is a normal shooting, and if it is the AZB mode, the process proceeds to step S37 to check whether or not the zoom lens is used.

If it is not a zoom lens, auto zoom bracketing shooting cannot be performed, so the process proceeds to S39, and if it is a zoom lens, the process proceeds to S38 to check whether or not the image is in the macro range.

If it is in the macro range, the process goes to S39 because the auto zoom bracketing is not taken. If it is not in the macro range, the process goes to S44 because the auto zoom bracketing is taken.

In the case of normal photography or macro photography is carried out exposure calculation in S39 calculates the aperture value A _v and the shutter speed T _v, the release switch SWR is to turn on, the S34~S4
Repeat step 0 and wait. When the release switch SWR is turned on, the exposure circuit 37 is activated to expose the film (S4
1) When the exposure is completed, the winding motor 45 is started via the motor drive circuit 39 to wind the film (S4).
2) Set port PH to “0” and enter end processing (S
43).

If the zoom lens is not in the macro range with the AZB mode and the zoom lens is not in the macro range, the process proceeds to S44 regarding the AZB process because the AZB shooting is performed (No. 6B
See figure).

In S44, a difference df between the longest focal length f _max and the shortest focal length f _min of the zoom lens 11 is obtained. Next, the focal length of each photographing by auto zoom bracketing is obtained (S4
Five). In the present embodiment, each divided focal length is calculated by the following equation.

(However, n is the number of times of photographing obtained in FIG. 5.) Further, in order to move the zoom lens 11 from the current focal length f _now to the shortest focal length f _min or the longest focal length f _max , whichever is closer. The current focal length f _now and the shortest focal length f _min
A1 and the difference A2 between the longest focal length f _max and the current focal length f _now are obtained (S46, S47). The closer one may be either the case where the difference in the focal length is small or the case where the time required for zooming is short.

If zero any difference A1, A2, the zoom lens 11 moves to the shortest focal length f _min or longest focal length f _max So S54, both not zero, to check which of the people is small ( S49). If the difference A2 is smaller, the value of the zoom focal length f _zoom is set to the value of the longest focal length f _max and then communication of the CPU communication code 1 is performed (S50). If the difference A1 is smaller, the zoom focal length is set. The CPU communication code 1 is communicated by setting the value of f _{zoom to} the value of the shortest focal length information f _min (S51). The CPU communication code 1 is data communication from the main CPU 33 to the lens CPU 25. The lens CPU 25 that has received the zoom focal length f _zoom from the main CPU 33 performs zooming based on the zoom focal length f _zoom .

The main CPU 33 communicates with the lens CPU 25 during the zooming.
Communication in CPU communication mode 2 is performed. In other words, lens CPU 25
, The communication of the zoom flag indicating whether the zooming operation is being performed and the current focal length f _now is received (S52).

Then, the main CPU 33 checks whether or not the zoom flag sent by this communication is “1”, that is, whether or not the zooming operation is being performed (S53), and
The communication in the communication mode 2 is repeated until the zooming ends, and when the zooming ends, the process proceeds to S54.
The end of zooming is known from the fact that the zoom flag has changed to “0”.

In S54, the number-of-shots counter K is set to zero.
With the above operation, the initial setting of the AZB operation is completed.

When the initial setting is completed, it is checked whether the release switch SWR is on (S55). If it is not turned on, the process returns to S34, and the process from S34 to S55 is repeated to wait for turning on.

When the release switch SWR is turned on, the CPU communication code 0
Is performed to input various data of the zoom lens 11 (S56). By exposure calculation obtains the aperture value A _v and the shutter speed T _v (S57), performs exposure control on the basis of these values (S58), wind one frame of the film (S59).

Thereafter, the value of the number-of-photographs counter K is incremented by 1 (S60), and it is checked whether the value is equal to n (S61). If they are equal, the port PH is set to "0" since the image has been photographed n times set in advance, and the process proceeds to the end processing (S65). If they are not equal, the image has not been photographed n times, so the flow proceeds to S62 to set the zoom focal length f _zoom to the divided focal length f _{k + 1} by the communication of the CPU communication code 1 and sends it to the lens CPU 25 (S62). The main CPU 33 communicates with the lens CPU 25 and the CPU communication code 2 during the zooming (S63). That is, the communication of the zoom flag and the current focal length fnow is received from the lens CPU 25, and it is checked whether or not the zoom flag is “1”, that is, whether or not the zooming operation is being performed (S64), and the communication of the CPU communication code 2 is performed. Are repeated until the zooming ends, and when the zooming ends, the process proceeds to S56. On the other hand, the lens CPU 25 receiving this data sets the current focal length f _now to the divided focal length f _{k + 1}
Perform zooming so that

Upon completion of this zooming, the process returns to S56, and the loop processing of S56 to S64 is repeated n times. By this loop processing, auto zoom bracketing is performed, and n times of photographing with different focal lengths are performed each time.

Next, regarding the zooming operation of the lens CPU 25, the seventh
This will be described with reference to the lens main flowchart shown in the figure.

When the main CPU 33 sets the port PH to “1”, the power of the battery 51 is supplied from the regulator 47 to the lens CPU 25 via the body contact 53b and the lens contact 29b, and the software starts running.

The lens CPU 25 first performs port initialization and ram initialization (S71, S72). Then, the input of the level of the ports P1 to P5, that is, the code input of the zoom code board 21 is performed (S73), and this is converted into the current focal length f _now corresponding to the level of each code and set in the RAM (S73).
74). This RAM contains the current focal length f _now ,
The zoom focal length f _zoom sent by the CPU communication code 1 from the main CPU 33 and lens data unique to this lens are set.

Next, it is checked whether the zoom focal length f _zoom is equal to the current focal length f _now (S75). If not equal, the zoom motor 19 is energized via the motor driver 27 so that the current focal length f _now zooms in the direction equal to the zoom focal length f _zoom , and the zoom flag is set to “1”. The process returns to S73 (S76, S77). If they are equal, the power supply to the zoom motor 19 is stopped to stop the zooming, the zoom flag is set to "0", and the process returns to S73 (S78, 79).

With the above operation, the current focal length f _now of the zoom lens 11 is obtained.
Is the zoom focal length f _zoom specified by the main CPU 33.
Is set to

Next, the communication interrupt operation of the lens CPU 25 will be described based on the flowchart shown in FIG. 8 and the timing chart shown in FIG. Main CP
For communication from U33 to lens CPU 25, port ▲ ▼ is “L”
It is performed in the state set to. The main CPU 33 drops the port ▲ ▼ to “L” at the start of communication, and
Output the clock pulse to ▼. And the port SI
Output to O the communication data synchronized with the clock signal of port ▲ ▼. In this embodiment, as shown in Table 1 below, the first two bits of the communication data are loaded with the CPU communication code to specify the transmission direction and the transmission data, and the subsequent bits are loaded with predetermined data.

When the port ▲ ▼ changes to “L”, the lens CPU 25
Exiting from the lens main flow chart, ▲ in FIG.
▼ Enter the interrupt routine. In this interrupt routine, first, the first 2-bit CPU communication code output to the port SIO is input, and the type of the CPU communication code is determined (S81, S82).

If the CPU communication code is 0, the lens data stored in the RAM of the lens CPU 25 is transmitted (S83). If the CPU communication code is 1, the zoom focal length f _zoom is received (S84).
If the U communication code is 2, the zoom flag and the current focal length f _now are transmitted and the process returns (S85).

The interrupt communication is performed in S34, S50, S51, S52, S5
6, executed in S62 and S63.

According to the present embodiment, the photographer can set the number of divisions of the variable focal length range of the zoom lens, and zooming and release are performed continuously for each of the divided focal lengths. You can choose the best framing from the images.

In the above-described embodiment, the distance between the shortest focal length and the longest focal length is divided by n, zooming is performed to the focal length end closer to the focal length at the time of the release operation, and the zooming is performed from this focal length end to another focal length end. Although the zooming is stopped and photographing is performed with the zooming stopped at each of the n divided focal lengths, the present invention is not limited to this embodiment. For example, the focal length from the current focal length f _now to the longest focal length f _max or the shortest focal length f _min is represented by n
A configuration in which the image is divided and taken while zooming to the longest focal length f _max or the shortest focal length f _min side may be adopted. In this case
The processing in S44 and S45 is as follows.

If auto-zoom bracketing the longest focal length f _max side from the current focal length f _now, the S44, and df = f _max -f _now, in S45, replace f ₁ with f _now.

Conversely, when performing auto zoom bracketing from the current focal length f _now to the shortest focal length f _min side, S44 is set to df = f _min −f _now, and in S45, f ₁ is replaced with f _now .

Further, since it is not necessary to change the zoom bracketing start position, S46 and S47 are set to A1 = 0 and A2 = 0.
The processing of S48, S49, S50, S51, S52 and S53 is skipped. Further, all the processes of S46 to S53 may be skipped.

By the above processing, in S54 to S64, the current focal length f
Auto zoom bracketing is performed from _now to the shortest focal length f _min or the longest focal length f _max side.

Further, in the present embodiment, the number of times of photographing by the automatic zoom bracketing is manually set, but it may be configured to set this automatically. For example, the number of times of shooting may be set in advance according to the zoom ratio of the zoom lens. The processing in that case will be described. The steps shown in FIG. 10 are inserted immediately before S44 in the main flowchart in FIG. 6B.

When entering S91 from S38, the zoom ratio Count is set to f _max / f _min . Then, it is checked whether the zoom ratio Conut is smaller than 2, larger than 2, smaller than 3, or larger than 3 (S92, S94).

If it is smaller than 2, the number of shootings is set to n = 3 (S93),
If it is larger than 2 and smaller than 3, the number of times of shooting n = 5 is set (S95), and if it is larger than 3, the number of times of shooting n = 8 is set (S96). Then, the process proceeds to S44.

In this case as well, zoom bracketing may be started from the current focal length, but as shown in FIG. 6B, zooming is performed from the shortest focal length f _min to the longest focal length f _max or in the opposite direction. It is better to let it.

In the present embodiment, the photometry is not performed during the auto zoom bracketing operation. However, a new photometry and an exposure calculation based on the effective aperture value of each focal length are performed for each shooting. Good. In this case, prior to the exposure calculation of S57, to input and photometric calculation of subject luminance B _v.

Although the automatic zoom bracketing device of the present invention has been described with reference to the illustrated embodiments, the present invention is not limited to these embodiments. For example, a zoom lens and a CPU for controlling the zoom motor are mounted on the taking lens, but these may be mounted on the camera body.

In addition, the present auto zoom bracketing device can be mounted on a lens shutter type camera in which a taking lens is fixed to a camera body.

Further, the automatic zoom bracketing device can be mounted on an electronic still camera. In this case, the operation is the same as that of the above-described embodiment except that the magnetic head is moved to the next recording track by the tracking device each time the photographing operation is completed.

[Effects of the Invention] As is clear from the above description, according to the auto zoom bracketing device of the present invention, it is possible to shoot at a plurality of focal lengths, so that a photograph with the most preferable framing can be obtained. You can enjoy the change of perspective due to the difference.

Further, according to the present invention, since the photographer can set the focal length and the number of times of photographing in the auto zoom bracketing, photographing can be performed more in accordance with the photographer's intention.

[Brief description of the drawings]

FIG. 1 is a control circuit diagram of an embodiment of a camera to which the auto-bracketing apparatus of the present invention is applied, FIG. 2 is a diagram schematically showing a zoom lens of the camera, and FIG. 3 is a plan view of the camera. FIG. 4 is a view for explaining a display mode of a display of the camera, FIG. 5 is a flowchart relating to an operation of setting the number of times of photographing of the camera, and FIGS. 6A, 6B and 6C are views of an automatic operation of the camera. FIG. 7 is a flowchart of an operation on the photographing lens side, FIG. 8 is a flowchart of a communication interrupt operation, FIG. 9 is a timing chart of a communication operation, and FIG. 10 is an auto zoom bracketing operation. 13 is a flowchart of another embodiment relating to a pointing operation. 11 ... Zoom lens, 13 ... Zoom lens barrel, 19 ... Zoom motor, 21 ... Code plate, 23 ... Reading brush, 25 ... Lens CPU, 27 ... Motor driver, 31 ... Camera body, 33 … Main CPU, 35… Photometry circuit, 37… Exposure circuit, 39… Film winding motor, 41… Display, 55… Release button, 57… Mode / drive lever, 59… Select lever

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-58-103273 (JP, A) JP-A-58-102220 (JP, A) JP-A-2-300730 (JP, A) JP-A-2-102 37316 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B ^7/ 28-7/40 G02B ⁷ /02-7/105 G03B 7/00-7/28 G03B 13/36

Claims (5)

(57) [Claims] 1. An auto-bracketing apparatus for photographing while changing a focal length of a photographing lens capable of changing a focal length, wherein said photographing lens sets a plurality of focal lengths for photographing; A focal length changing unit for sequentially changing a focal length of the lens to a plurality of focal lengths set by the focal length setting unit; and an exposure device exposing for each focal length changed by the focal length changing unit. The focal length setting means includes: a photographing number setting means for setting the number of photographing times; and dividing the changeable focal length range of the photographing lens according to the number of photographing times by the photographing number setting means, and photographing. An automatic bracketing device for a camera, comprising: a dividing means for determining a focal length. 2. The method according to claim 1, wherein the dividing unit sets a focal length for photographing by dividing a focal length from the longest or shortest focal length to the shortest or longest focal length in accordance with the number of times of photographing. 2. The automatic bracketing device for a camera according to claim 1, wherein the focal length of the photographing lens is changed to a longest or shortest focal length, and the focal length is sequentially changed from the longest or shortest focal length to the divided focal length on the shortest or longest focal length side. 3. The dividing means divides a focal length of the photographing lens from a current focal length to a longest or shortest focal length according to the set number of photographing times. 2. The automatic bracketing device for a camera according to claim 1, wherein the focal length of the lens is sequentially changed to the longest or the divided focal length on the longest focal length side. 4. The exposure apparatus retains an initial exposure value in auto bracketing photography, and each time the focal length is changed, an aperture value and a shutter speed using an effective aperture value at each focal length as an exposure calculation factor. The camera auto-bracketing device according to any one of claims 1 to 3, wherein 5. The automatic bracketing device for a camera according to claim 1, further comprising a display device for displaying that the image is auto bracketing photographing.