JP2969872B2 - Photometric calculation device for camera - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a photometric operation device for an autofocus camera.

B. Prior Art In a conventional autofocus camera, whether the focus of the taking lens is adjusted in an automatic mode or a manual mode is switched by an automatic / manual selection switch. In the automatic mode, the photographing lens is driven by the automatic focus adjustment device based on the focus detection information of the focus detection device, and the focusing operation is performed. On the other hand, in the manual mode, the user manually rotates the distance ring of the photographic lens while focusing on the subject image on the matte surface of the viewfinder screen to adjust the focus, or press the shutter release halfway to activate the focus detection device and focus. The distance ring is manually rotated so that the mark is lit, and the focus is adjusted. The latter is also called a focus aid method.

In such a conventional photometric operation device of an autofocus camera, an appropriate exposure value is calculated by a different algorithm between a manual mode and an automatic mode.

Normally, a photometry device performs photometry for each area obtained by dividing the shooting screen into a plurality of areas, and in a manual mode, for example, performs an average photometry operation based on the luminance information based on the luminance information. Is calculated.

On the other hand, in the automatic mode, photometry is performed based on luminance information from the photometry device and focus detection information from a focus detection device, such as an exposure calculation device disclosed in Japanese Patent Application No. 1-231041 by the present applicant. An appropriate exposure value is calculated by a so-called automatic algorithm that performs a calculation.

That is, the focus detection area 1 as shown in FIG. 11 is set in the photometric areas F1 to F3 at the center of the eight divided shooting screen as shown in FIG. This focus detection area 1 includes areas D1 to
D6 is divided into six, areas D1 and D2 correspond to photometry area F1, areas D3 and D4 correspond to photometry area F2, and areas D5 and D6 correspond to photometry area F3.
Corresponding to Then, each photometric area F1 to
Photometry is performed for each F8, and a focus is detected by the focus detection device for each of the focus detection areas D1 to D6. Further, a photometric value of a corresponding photometric area is weighted according to a focus detection state of each focus detection area, and a photometric calculation is performed based on the luminance information. In other words, the proper exposure value is calculated with emphasis on the luminance information of the photometry area corresponding to the focus detection area including the main subject.

C. Problems to be Solved by the Invention However, in such a conventional photometric calculation device,
When shooting in the manual mode, the exposure calculation is performed by the manual algorithm even when the main subject is in focus in the focus detection area, so that an appropriate exposure value for the main subject in the focus detection area cannot be obtained. There's a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a photometric operation device of a camera capable of photographing with an exposure value suitable for a main subject focused in a focus detection area even in a manual mode.

D. Means for Solving the Problems The present invention will be described with reference to FIG. 1 (a) which is a claim correspondence diagram. The present invention performs focus detection for a plurality of areas in a photographing screen and performs Focus detection means 3 for outputting focus detection information, and photometry means 5 for performing photometry on a plurality of areas in the shooting screen and outputting luminance information for each area
Selecting means 14 for selecting whether to perform the focus adjustment of the taking lens in the automatic mode or the manual mode, and when the manual mode is selected by the selecting means 14, the manual algorithm suitable for the manual focus adjustment is appropriate. When the automatic mode is selected by the selection unit 14, the calculation unit 7 calculates an exposure value using an automatic algorithm suitable for automatic focus adjustment. .

When the manual mode is selected by the selection unit 7 and the in-focus state is detected in at least one focus detection area by the focus detection unit 3, the calculation unit 7 calculates an appropriate exposure value by an automatic algorithm. Thereby, the above object is achieved.

The automatic algorithm of the photometric operation device for a camera according to the second aspect calculates an appropriate exposure value based on luminance information of the photometric means and focus detection information of the focus detection means.

Further, the photometric operation device for a camera according to claim 2 will be described in association with FIG. 1 (b) which is a claim correspondence diagram. The calculation unit 8 is provided, and the automatic algorithm calculates an appropriate exposure value based on the luminance information of the photometry unit 5, the focus detection information of the focus detection unit 3, and the distance information to the subject of the distance calculation unit 8.

E. Operation When the manual mode is selected by the selecting unit 14 and the in-focus state is detected in at least one focus detection area by the focus detecting unit 3, the calculating unit 7 performs the appropriate exposure by the automatic algorithm even in the manual mode. Calculate the value.

In addition, the calculation means 7 of the photometry calculation device for a camera according to claim 2 selects the manual mode by the selection means 14,
When the in-focus state is detected in at least one focus detection area by the focus detection means 3, the automatic mode is also used in the manual mode, that is, based on the luminance information of the photometry means 5 and the focus detection information of the focus detection means 3. Calculate the appropriate exposure value.

Further, the calculating means 7 of the photometric calculating device for a camera according to claim 3 is configured such that when the manual mode is selected by the selecting means 14 and the in-focus state is detected in at least one focus detecting area by the focus detecting means 3. Calculates an appropriate exposure value even in the manual mode based on an automatic algorithm, that is, luminance information of the photometric unit 5, focus detection information of the focus detection unit 3, and distance information to the subject of the distance calculation unit 8.

In the above paragraphs D and E for describing the configuration of the present invention, the same reference numerals are used as in the embodiments corresponding to the reference numerals for the respective means in order to facilitate understanding of the present invention. It is not limited to the embodiment.

F. Embodiment FIG. 2 is a block diagram showing an embodiment of the present invention.

The luminous flux from the subject a passes through the photographing lens 2 that forms the subject image on the film surface F, passes through the central semi-transparent portion of the main mirror M, and is guided to the focus detection unit 3 via the sub-mirror SM. Further, a part of the light beam reflected by the main mirror M is guided to the divided photometry unit 5 via the pentaprism 4.

The focus detection unit 3 includes a well-known focus detection lens 3a, a charge accumulation type image sensor 3b, and a focus detection information calculation unit 3c. Then, as shown in FIG. 3, focus detection areas A1 to A9 as shown in FIG. 4 are set in the central areas B1 to B3 of the photometry area obtained by dividing the photographing screen into eight, and the focus adjustment of this focus detection area is performed. A pair of image sensors 3b for detecting information are arranged. Here, as shown in FIG.
A1 to A3 correspond to the photometry area B1, the focus detection areas A4 to A6 correspond to the photometry area B2, and the focus detection areas A7 to A9 correspond to the photometry area B3.

The focus detection information calculation unit 3c calculates focus detection information of each of the areas A1 to A9 based on the output of the pair of image sensors 3b, that is, the defocus amount ΔAF, for example, by a correlation calculation method disclosed in Japanese Patent Application Laid-Open No. 60-37513. (I) (I = 1 to 9, the unit is μm) is calculated intermittently. The defocus amount δAF (I) is an amount corresponding to the distance along the optical axis between the imaging plane of the subject by the photographing lens 2 and the conjugate plane of the film plane F.

FIG. 5 is an example of calculation of the defocus amount δAF (I) of each of the focus detection areas A1 to A9 by the focus detection information calculation unit 3c.
For each area, it indicates whether the object is in focus or out of focus. These defocus amounts δAF (I)
Indicates the defocus amount of each area, δAF (1) indicates the defocus amount of the focus detection area A1 shown in FIG. 4, and similarly, δAF (2) to δAF (9) indicate the areas A2 to This shows the amount of defocus for A9.

The divided photometric unit 5 is composed of a light receiving element 5a and a photometric circuit 5b, and the light receiving element 5a is connected to the photometric area B1 shown in FIG.
BB8 and photometry value BV (I) (I = 1)
To 8) are detected.

The lens driving unit 6 controls the driving of the photographing lens 2 according to a lens driving amount command value from a control circuit 7 described later in the automatic mode.

The control circuit 7 includes a microcomputer and its peripheral components. The control circuit 7 executes a control program described later to calculate an appropriate exposure value. In the automatic mode, the focus detection areas A1 to A1 are selected by one of the following selection methods.
One area is selected from A9, and the lens drive amount command value is calculated based on the defocus amount δAF (I) of that area.

(B) Select an area having an object closest to the camera.

(B) Select an area having the minimum defocus amount.

(C) Select a region having the highest reliability of focus detection accuracy.

(D) Select an area where the subject is located at a close distance from the camera and the reliability of focus detection accuracy is high. That is, the score of the region having the subject closest to the camera is set to 9, and 8, 7, 6,... On the other hand, the score of the region having the highest reliability of the focus detection accuracy is set to 9, and in the following order
8,7,6, ... Then, the points are totaled for each area, and the area having the highest score is selected.

(E) Select an area where the defocus amount is small and the reliability of the focus detection accuracy is high. That is, similarly to the above item (d), points are assigned in the order of smaller defocus amount and in order of higher reliability of focus detection accuracy, and an area having the highest sum of both points is selected.

The lens position detector 8 detects the current position of the photographic lens 2 by using an encoder that generates a signal indicating the absolute position of the photographic lens 2. The exposure control section 9 controls the shutter mechanism section 10 and the aperture mechanism section 11 based on the exposure value calculated by the control circuit 7. The display unit 12 displays a focus mark in the viewfinder if the focus detection area selected by any of the above methods is in a focused state when the shutter release 13 is half-pressed.

The automatic / manual selection switch 14 is a switch for selecting an automatic mode in which the photographing lens 2 is driven to focus through the lens driving unit 6, that is, an automatic focus, and a manual mode in which the distance ring is manually rotated to perform focusing. It is.

FIG. 6 is a flowchart showing a control program executed by the control circuit 7. The control circuit 7 starts executing this program when the shutter release 13 is half-pressed. The operation of the photometric operation device will be described with reference to FIG.

In step S1, a defocus amount δAF (I) for each of the focus detection areas A1 to A9 is calculated via the focus detection unit 3.
In the following step S2, it is determined whether the automatic mode or the manual mode is selected by the switch 14,
If the mode is the manual mode, the process proceeds to step S3, and if the mode is the automatic mode, the process proceeds to step S9.

In the manual mode, the area number I is reset in step S3, and the process proceeds to step S4 to increment the area number I. Next, in step S5, the defocus amount δAF (I) of the focus detection area A1 detected in step S1 is −50 μm.
It is determined whether m ≦ δAF (I) ≦ + 50 μm, that is, whether it is within a range that can be regarded as in-focus. If it is within the in-focus range, the process proceeds to step S11; otherwise, the process proceeds to step S6. In step S6, it is determined whether or not I = 9. If I = 9, the process proceeds to step S7, and if not, the process returns to step S4. That is, the defocus amount δ of the focus detection areas A1 to A9
It is sequentially determined whether or not AF (I) is within the focusing range. If the defocus amount δAF (I) of any one of the regions is within the focusing range, the process proceeds to step S11. If not, the process proceeds to step S7.

In step S7, a subroutine of an exposure calculation first algorithm described later is executed. That is, when the focusing of the taking lens 2 is performed in the manual mode, the focus detection area
If the in-focus state is not detected in any of the areas A1 to A9, the exposure value is calculated by the first exposure calculation algorithm based on the assumption that the main subject is located outside the focus detection areas A1 to A9. The shutter mechanism 10 via the exposure controller 9 based on the exposure value calculated in the above steps.
And the diaphragm mechanism 11 is controlled.

When the in-focus state is detected in any of the focus detection areas A1 to A9 in step S5, the process proceeds to step S11, and the focus mark in the finder is turned on via the display unit 12, and
Proceed to step S12.

In step S12, a subroutine of an exposure calculation second algorithm described later is executed. In other words, when a focus state is detected in any of the focus detection areas A1 to A9 when focusing is performed in the manual mode, it is determined that the main subject is in the focus detection areas A1 to A9, and the exposure calculation is performed. The exposure value is calculated by two algorithms.

Next, when the automatic mode is selected in step S2, it is determined in step S9 whether or not the camera is in focus. If the camera is in focus, the process proceeds to step S11; otherwise, the process proceeds to step S11.
Proceed to 10. In step S10, the defocus amount δ of the area selected from the focus detection areas A1 to A9 as described above.
The lens drive amount command value is calculated based on AF (I), and the photographing lens 2 is driven to focus through the lens drive unit 6. Thereafter, the process returns to step S9 to determine whether or not the subject is in focus. If the subject is in focus, the in-focus state is displayed in step S11, and then the subroutine of the second algorithm for exposure calculation is executed in step S12.

FIG. 7 is a flowchart showing a first algorithm of the exposure calculation.

First, in step S21, the photometric value B of the photometric areas B1 to B8
V (I) (I = 1 to 8) is read. In step S22,
The photometric value BVc of the photometric area B1 to B4 at the center of the shooting screen is (1)
It is calculated by the formula.

 BVc = {S1 · BV (1) + S2 · BV (2) + S3 · BV (3) + S4 · BV (4)} / (S1 + S2 + S3 + S4) (1) where S1, S2, S3, and S4 are It is the area of each photometry area B1, B2, B3, B4.

That is, the photometric value BVc is calculated by weighting according to the size of the area of each region, and is a photometric value when the photometric regions B1 to B4 are regarded as one region.

Next, in step S23, the photometric values BVc, BV (5) to BV (8) of the central area B1 to B4 and the peripheral area B5 to B8 are obtained.
The maximum value BVmax, the minimum value BVmin, and the difference ΔBV between them are calculated from equation (2).

BVmax = Max ｛BVc, BV (5), BV (6), BV (7), BV (8)｝ BVmin = Min ｛BVc, BV (5), BV (6), BV (7), BV (8 )｝ ΔBV = BVmax−BVmin (2) It should be noted that the photometric values BV (1) to B4 of the respective photometric areas B1 to B4 at the center portion
The reason why the center photometric value BVc calculated in the above step is used instead of BV (4) is that the areas B1 to B3 have the same weight as the other areas although the areas are smaller than the other areas. This is because an appropriate exposure value cannot be calculated.

Further, in step S24, an average photometric value BM and a low-luminance-weighted photometric value BLM are calculated by equation (3).

BM = {BVc + BV (5) + BV (6) + BV (7) + BV (8)} / 5 BLM = (BM + BVmin) / 2 (3) The low-luminance-weighted photometric value BLM has a small photometric value area. Is an exposure value calculated with emphasis on.

After calculating each photometric value in the above steps, step S2
At 5, it is determined whether or not the highest photometric value BVmax is smaller than Lv (brightness) 5. If BVmax <Lv5, the process proceeds to step S26; otherwise, the process proceeds to step S27. In step S26, since the highest photometric value BVmax is smaller than Lv5, it is determined that the scene is a sunset scene or a night scene, and the low-luminance-weighted photometric value BLM is adopted as the photometric value B.

If it is determined in step S25 that BVmax ≧ Lv5, it is determined in step S27 whether or not the highest photometric value BVmax is smaller than Lv11. If BVmax <Lv11, the flow proceeds to step S28; otherwise, the flow proceeds to step S31. In step S28, it is determined whether or not the difference ΔBV between the highest value and the lowest value of the photometric value is smaller than Lv2. If ΔBV <Lv2, the process proceeds to step S29; otherwise, the process proceeds to step S30. In step S29, Lv5
≦ BVmax <Lv11, so it is a general daytime shooting,
In addition, since the difference between the highest luminance and the lowest luminance is small, the average photometric value BM is adopted as the photometric value B in consideration of the balance of the entire photographing screen. In step S30, since the difference between the highest luminance and the lowest luminance is large in general daytime photographing, the probability that the main subject is located in the low-luminance photometric region is high, and the low-luminance-weighted photometric value BLM is used as the photometric value B. .

If it is determined in step S27 that BVmax ≧ Lv11, it is determined in step S31 that there is a high-luminance object such as the sun in the shooting screen, and the photometry value B is set to the low-luminance-weighted photometry value BL.
Adopt M.

As described above, according to the first exposure calculation algorithm, the photometric calculation is performed in a balanced manner over the entire screen regardless of where the main subject is located on the photographing screen. Therefore, when the main subject is not in the focus detection area in the manual mode. The optimal exposure value is obtained.

FIGS. 8A and 8B are flowcharts showing a second exposure calculation algorithm.

After resetting the area number I in step S41, the area number I is incremented in step S42. In a succeeding step S43, the focus shift amount δAF (I) (I = 1 to 9) of each of the focus detection areas A1 to A9 is read. In this defocus amount δAF (I), the + sign indicates the front focus state, and −
The sign indicates the back focus state.

In steps S44 to S53, the focus detection area
A weight D (I) (I = 1 to 9) of each area is obtained in order from A1 according to the defocus amount δAF (I).

That is, when it is determined in step S44 that δAF (I)> 150 μm, the weight D (I) is set to 0 in step S45, assuming that the camera is in the considerably focused state.

If it is determined in step S47 that 150 μm ≧ δAF (I)> 50 μm, the weight D (I) is set to 2 in step S48, assuming that the front focus state is set.

If it is determined in step S49 that 50 μm ≧ δAF (I)> − 50 μm, it is determined in step S50 that the object is in focus and the weight D (I) = 3.

If it is determined in step S51 that −50 μm ≧ δAF (I)> − 150 μm, the weight D (I) is set to 1 in step S52, assuming that the state is slightly rear focus.

Further, if it is determined in step S51 that −150 μm ≧ δAF (I), the weight D (I) is set to 0 in step S53, assuming that the corresponding pin state is established.

In step S46, the weight D is applied to all the focus detection areas.
It is determined whether or not (I) has been calculated. If the calculation has been completed, the process proceeds to step S54 in FIG. 8B, and if not, the process returns to step S42.

Next, in step S54, the photometric value BV of each photometric area B1 to B8
(I) (I = 1 to 8) is read. Step S55
Then, the weights D (I) (I = 1 to 9) of the focus detection areas A1 to A9 obtained in the above steps are read.

In step S56, the average photometric value Br of the peripheral photometric areas B4 to B8 is obtained by the equation (4).

Further, in step S57, the sum M of the weights D (I) (I = 1 to 9) of the focus detection areas A1 to A9 is obtained by the equation (5).

Then, in a step S58, it is determined whether or not the sum M of the weights calculated in the above step is 0.
Proceed to 3, otherwise proceed to step S59.

In step S59, the weight D of the focus detection areas A1 to A9
According to (I), the photometry areas B1 to B3 at the center are obtained by the equation (6).
Are weighted to calculate the central photometric value Bc.

In a succeeding step S60, it is determined whether or not the difference between the peripheral portion average photometric value Br and the central portion photometric value Bc calculated in the above step is larger than Lv2. If (Br−Bc)> Lv2, the process proceeds to step S61. , Otherwise step S
Proceed to 62.

In step S61, since the luminance is higher at the peripheral portion than at the central portion, the photometric value Bc at the central portion where it is determined that the main subject is present in the photometric value B is adopted. In step S62, since there is not much difference in luminance between the central portion and the peripheral portion, the average value of the central portion photometric value Bc and the peripheral portion average photometric value Br is adopted as the photometric value B. That is, B = (Bc + Br) / 2. In step S58, the sum M of the weights D (I) is 0.
When it is determined in step S63 that the front focus state or the corresponding rear focus state has been set, the peripheral area average photometric value Br is used as the photometric value B in step S63.

As described above, according to the second algorithm of the exposure calculation, the photometric value of the central photometric area is weighted according to the amount of defocus of each focus detection area, and the luminance of the main subject determined to be in the focus detection area is weighted. , The photometric calculation is performed, so that an appropriate exposure value can be obtained for the main subject.

As described above, if the in-focus state is not detected in any of the focus detection areas when the manual mode is selected, the photometry calculation is performed based on the photometry value of each photometry area by the first exposure calculation algorithm. Therefore, an appropriate exposure can be obtained irrespective of where the main subject is located in the shooting screen. When the manual mode is selected and at least one of the focus detection areas is detected in focus,
As in the case where the automatic mode is selected, the photometry calculation is performed with emphasis on the photometry value in the central photometry area by the second exposure calculation algorithm, so that an appropriate exposure value for the main subject can be obtained.

In the above-described embodiment, when the manual mode is selected and the in-focus state is detected in at least one of the focus detection areas, based on the photometric value of each photometric area and the defocus amount of each focus detection area. At this time, the exposure value is calculated based on the photometric value of each photometric area, the amount of defocus in each focus detection area, and the photographing distance to the subject detected by the lens position detection unit 8. Then, a more appropriate exposure value can be calculated. Hereinafter, this modified example will be described.

FIGS. 9A and 9B are flowcharts showing a modified example of the above-described second algorithm for exposure calculation. In addition,
The same steps as those in the flowcharts shown in FIGS. 8 (a) and 8 (b) are denoted by the same step numbers, and different points will be mainly described.

As in steps S41 to S53 in FIG.
After obtaining the weight D (I) according to the defocus amount δAF (I) of each of the focus detection areas A1 to A9, the current position of the photographing lens 2 detected by the lens position detection unit 8 in step S53 'in FIG. The position is read, and the distance to the subject, that is, the photographing distance L is calculated based on the current position of the photographing lens 2 and the focal length f of the photographing lens 2.

Next, after calculating the central portion photometric value Bc in step S59, the flow advances to step S71 to determine whether or not the shooting distance L is smaller than 0.7 m. If L <0.7 m, the flow advances to step S72. Proceed to S73. In step S72, L <0.
When the distance is 7 m, it is determined that the photograph is a close-up, and the central photometric value Bc is adopted as the photometric value B.

In step S73, it is halved whether or not the shooting distance is L <5m. If L <5m, the process proceeds to step S60; otherwise, the process proceeds to step S74. In step S74, when L ≧ 5m, it is determined that landscape photography has been performed, and the average value of the photometric values BV (1) to BV (8) of all photometric areas is adopted as the photometric value B.

When step S73 is affirmed, 0.7m ≦ L <
5 and it is determined that the photographing is a general photographing, and the process proceeds to step S60, and the photometric value B is determined by performing finer pattern division in the same manner as described above.

As described above, when the manual mode is selected and the in-focus state is detected in at least one of the focus detection areas, based on the photometric value of each photometry area, the defocus amount of each focus detection area, and the shooting distance. Since the photometric calculation is performed by using the photometric calculation, a more appropriate exposure value can be calculated.

In the configuration of the above embodiment, the focus detection unit 3 automatically selects the focus detection unit, the divided photometry unit 5 selects the photometry unit, the control circuit 7 selects the calculation unit, and the lens position detection unit 8 selects the distance calculation unit. The switches 14 each constitute a selection unit.

G. Effects of the Invention As described above, according to the present invention, even when performing focus adjustment in the manual mode, if the in-focus state is detected in at least one focus detection area, the appropriate exposure value is set by the automatic algorithm. Since the calculation is performed, the luminance information of the main subject located in the focus detection area is regarded as important, and an appropriate exposure value can be obtained.

In addition, even when performing the focus adjustment in the manual mode, if the in-focus state is detected in at least one focus detection area, the brightness information of each photometry area and each focus detection area can be obtained. , The exposure value is calculated based on the focus detection information, so that a more appropriate exposure value can be obtained.

Further, the photometric operation device of the camera according to claim 3, when the focus state is detected in at least one focus detection area even when performing focus adjustment in the manual mode, luminance information of each photometry area, each focus detection area Since the exposure value is calculated based on the focus detection information and the distance information to the subject, a more appropriate exposure value can be obtained.

[Brief description of the drawings]

1 (a) and 1 (b) are claims correspondence diagrams. FIG. 2 is a block diagram showing one embodiment of the present invention, FIG. 3 is a diagram showing a divided photometric region, FIG. 4 is a diagram showing the relationship between the center of the divided photometric region and the focus detection region, FIG. FIG. 6 is a diagram showing an example of calculating the defocus amount of the focus detection unit, FIG. 6 is a flowchart showing an example of a photometric calculation program, FIG. 7 is a flowchart showing a first algorithm of exposure calculation, and FIGS. 8 (a) and (b). Is a flowchart showing a second algorithm of exposure calculation, FIG. 9 is a flowchart showing a modification thereof, FIG. 10 is a diagram showing a conventional divided photometry area, and FIG. 11 is a relation between a central portion thereof and a conventional focus detection area. FIG. 3: Focus detection unit, 5: Split photometry unit 7: Control circuit, 8: Lens position detection unit 14: Automatic / manual selection switch

Claims (3)

(57) [Claims] 1. A focus detecting means for performing focus detection on a plurality of regions in a photographing screen and outputting focus detection information for each region, and performing photometry on a plurality of regions in the photographing screen to obtain luminance information for each region. Output metering means, selecting means for selecting whether to adjust the focus of the taking lens in automatic mode or manual mode, and a manual algorithm suitable for manual focusing when manual mode is selected by the selecting means Calculating an appropriate exposure value according to the above, and when the automatic mode is selected by the selecting means, calculating means for calculating an appropriate exposure value by an automatic algorithm suitable for automatic focus adjustment. The calculation means selects the manual mode by the selection means, and detects the in-focus state in at least one of the focus detection areas by the focus detection means. A photometric operation device for a camera, wherein when it is issued, an appropriate exposure value is calculated by the automatic algorithm. 2. The photometric operation device for a camera according to claim 1, wherein said automatic algorithm calculates an appropriate exposure value based on said luminance information of said photometric means and said focus detection information of said focus detection means. A photometric calculation device for a camera. 3. The photometric operation device for a camera according to claim 1, further comprising a distance calculating unit that detects a position of the photographing lens and calculates distance information to a subject, wherein the automatic algorithm includes the photometric unit. A photometric calculation device for a camera, which calculates an appropriate exposure value based on the luminance information, the focus detection information of the focus detection means, and the distance information to the subject of the distance calculation means.