JPH0136087B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multi-photometric exposure control device that divides a field into a plurality of regions and measures the field.

Conventional devices of this type include those described in Japanese Patent Publication No. 55-2857 and Japanese Patent Application Laid-open No. 55-114918. This selects one of the three photometric outputs (maximum value Pmax, average value Pmean, and minimum value Pmin) calculated from a plurality of photoelectric outputs from the classification results of a predetermined category.

These functions automatically for general subjects, but if the main subject is smaller than one area that is divided and photometered, it is not possible to accurately obtain luminance information. For example, in the case of a subject such as a single flower against a white background, all of the photoelectric output will be the brightness of the white background, and the camera will only capture the flatness as the subject. At this time, no matter which of Pmax, Pmean, and Pmin was selected as the appropriate photometric output, the values were almost the same, and all had the disadvantage of resulting in underexposure. At this time
You could just use the ASA dial to correct it, but when the brightness difference became large, the correction was applied twice as well as the camera's correction function, resulting in overexposure.

The present invention solves these shortcomings and makes it possible to achieve proper exposure for a special subject with a single correction operation.

In order to achieve this object, the present invention includes a photometer 10 for dividing a field into a plurality of regions and measuring the light, and generating a plurality of photoelectric outputs corresponding to each region; , proper photometric output generation means capable of generating a plurality of photometric outputs existing between a photometric output corresponding to the maximum value of the plurality of photoelectric outputs and a photometric output corresponding to the minimum value of the plurality of photoelectric outputs. 14; and detection/selection means for detecting a state of a subject based on the plurality of photoelectric outputs and selecting a photometric output suitable for the state of the subject from among the plurality of photoelectric outputs; and a detection means for detecting a difference in magnitude between a maximum value and a minimum value of the plurality of photoelectric outputs; overexposure; Or instruction means 2 for instructing by manual setting that will result in underexposure.
5, 26; the detection means 29 and the instruction means 25;
26, the maximum value and the minimum value of the plurality of photoelectric outputs are significantly different, and the instruction means 2
5 and 26, the photometric output according to the instruction of the instruction means is selected from among the plurality of photometry outputs instead of the photometry output that should be selected by the detection/selection means 18 and 19; , when the maximum value and the minimum value of the plurality of photoelectric outputs are not significantly different and there is an instruction from the instruction means, the plurality of photometry outputs are selected in place of the photometry output to be selected by the detection/selection means. correction means 24, 30, 31, NOR for outputting a result obtained by adding a predetermined value to any of the outputs according to instructions from the instruction means;
1, NOR2/24, 43, 44, NOR1~
To provide a multi-photometric exposure control device equipped with NOR3, AND1 to AND13.

First, the concept of multi-photometry, which is the basis of the present invention, will be explained. The photographic screen is classified into a plurality of categories based on information regarding brightness and/or information regarding position, and it is possible to know for which brightness in each category the exposure should be adjusted to obtain an appropriate exposure as a whole. In fact, it has been found that the brightness at which exposure should be controlled to obtain properly exposed photographs for subjects under various conditions converges to the following three levels. That is, the first brightness level exists between the maximum value of the plurality of photoelectric outputs and the average value of these photoelectric outputs, and the second brightness level almost matches the average value of these photoelectric outputs. It has been found that a third brightness level exists between the minimum value of these photoelectric outputs and the average value. Note that this average value can be approximated by an average value, a median value, or a mode value.

Regarding the category classification, please refer to Japanese Patent Application Laid-Open No. 1983
No. 114918 uses brightness information and position information, but it is not limited to this, and the method is to divide the subject into multiple areas, measure the brightness of the main light source in each area, and then measure the brightness of the main light source there according to the classification. It may be a method of selecting an appropriate photometric output. For example, when the maximum value of a plurality of photoelectric outputs is Pmax, the minimum value is Pmin, and the average value is Pmean, the following classification may be performed.

(1) When Pmax≧9; In this case, the screen includes a scene that includes a fairly high-intensity subject, such as the sun or bright clouds, or a scene that includes the sky on a clear day.
Therefore, in this case, the main subject often exists on the low-luminance side, and to prevent the subject on the low-luminance side from being darkened, the exposure is adjusted to a luminance around the minimum value Pmin. If you do this, there is a concern that the high-brightness side will be too bright, but since the film has a latitude, even the relatively high-brightness side will be properly exposed.

For this purpose, select the minimum value Pmin.

(2) When 0≦Pmax<9; This case is a general daytime outdoor scene, an indoor scene, or a sunset scene. Therefore, in this case, it is necessary that the exposure is correct for the entire screen (although there is a main subject intended by the photographer, the exposure is correct only for this, making other subjects appear dark or bright). In order to prevent this, the average value is
Adjust exposure to brightness around Pmean.

For this purpose, the average value Pmean is selected.

(3) When Pmax<0; In this case, it is a night view. In a night scene, the main subject is in a high-brightness area, so the exposure is adjusted to a brightness around the maximum value Pmax.

For this purpose, select the maximum value Pmax.

Therefore, if you make a mistake in the above category classification in a multi-metering device, please refer to the above
If you reselect one of the brightness levels, the probability of obtaining proper exposure increases. This reselection must be performed as follows.

(1) For example, in Figure 1a, the brightness level selected by category is the average value Pmean
If you reselect the brightness level to adjust the exposure to a high brightness side that exceeds the maximum value Pmax or a low brightness side that exceeds the minimum value Pmin, even if the latitude of the film is taken into account. There is a risk that a subject on the low-brightness side will be completely crushed, or a subject on the high-brightness side will be completely cut off. Therefore, when the selected brightness level is Pmean, Pmax and
It is important not to reselect the brightness level to higher or lower brightness levels that exceed Pmin.

On the other hand, with a multi-metering device, when the light is backlit,
Pmin, and during spot light illumination
Pmax becomes the selected brightness level. In such a scene, the main subject is Pmin,
Since the brightness level corresponds to Pmax, it is unnecessary to reselect to a lower or higher brightness side exceeding this level. Therefore, when the selected brightness level is Pmin or Pmax,
It is sufficient to enable only reselection to the Pmean side.

Therefore, in this case, when the selected luminance level is Pmean, reselection is made to Pmax or Pmin, and when the selected luminance level is Pmin or Pmax, reselection is made to Pmean. In this way, the photographer only needs to instruct whether the reselection direction should be over or under, and the rest will be automatically reselected (Pmean→Pmax,
Pmean→Pmin) can be performed. This is because the brightness levels for obtaining proper exposure converge to the first to third brightness levels described above.

Incidentally, as shown in Japanese Patent Application Laid-Open No. 55-114918, there is an intermediate brightness level between the first to third brightness levels.
In the case where PH and PL are provided to obtain better exposure, as shown in Figure 1c,
One-stage change and two-stage change may be performed, as typified by reselection from Pmean to PH and Pmean to Pmax.

(2) However, when an object with uniform brightness (white background or black background) is used as a background,
In the case of a scene where daffodils are arranged in a narrow vase, Pmax, Pmean,
The level difference between Pmin is small. Therefore, no effect can be expected even if the brightness level is reselected as described above.

Therefore, the effect of exposure correction is made apparent by adjusting the exposure to a luminance level obtained by adding or subtracting a predetermined level from Pmax, Pmean, and Pmin.

FIG. 2 is a schematic diagram of the photometric optical system of the present invention. 1 is a photographic lens, 2 is a mirror, 3 is a viewfinder screen, 4 is a condenser lens,
5 is a pentaprism, 6 is a prism with a convex lens part, and finder screen 3
It functions to form the upper image onto the light receiving element 7.

The light receiving element 7 enables photometry divided into a plurality of areas as shown in FIG.

FIG. 4 is a block diagram showing an embodiment of the present invention. The photometry circuit 10 includes light receiving elements (PD ₀ to
PD _o-1 (PD ₀ ÷ PD ₄ in the case of Figure 3), and independent photoelectric output P ₀ corresponding to each area of the field.
~P _o-1 (in the case of Fig. 3, _P0 to _P4 and the following are the same) is output. It is assumed that the photoelectric outputs _P0 to _P4 are logarithmically compressed, and the apex value of the subject brightness, that is,
Corresponds to BV value (brightness value). The first photometric output generating circuit 11, the second photometric output generating circuit 12, and the third photometric output generating circuit 13 each have the following configurations:
An appropriate photometric output generation circuit 14 is configured.

A classification circuit 18 receives the photoelectric output and classifies it into a plurality of categories. The selection circuit 19 selectively operates the gate circuits 15 to 17 to select the photometric output set according to the category classification result. When the gate circuit 15 is opened, the output (for example, Pmax) of the first photometric output generation circuit 11 is output, and when the gate circuit 16 is opened, the output of the second photometric output generation circuit 1 is output.
2 output (for example, Pmean), and when the gate circuit 17 is opened, the third photometric output generation circuit 13
The output (for example, Pmin5) is transmitted to the apex calculation circuit 20.The apex calculation circuit 20 receives the selected photometric output and various information from the information setting section 21 (open aperture information, aperture value information, film sensitivity information, shutter speed information). etc.) and performs a known apex calculation, and transmits a calculation output signal to each of the display control circuit 22 and the exposure control circuit 23.

The display control circuit 22 displays the appropriate aperture value and appropriate shutter speed obtained by apex calculation, and the exposure control circuit 23 controls the aperture or shutter so that the appropriate aperture value or appropriate shutter speed is achieved.

The proper photometry output indicator 51 displays the display element 51a when the gate 15 is opened, the display element 51b when the gate 16 is opened, and the display element 51b when the gate 15 is opened.
7 is opened, the display element 51c is activated to notify the photographer of the selected photometric output.

The first setting means 25 is a means for setting when it is desired to preferentially photograph a subject on the high luminance side, and the second setting means 26 is a means for setting when it is desired to preferentially photograph a subject on the low luminance side. These can be set, for example, as shown in FIG. That is, the lever configuration is such that the position can be changed in three stages, and when the lever 100 is set to the "H" side, the switch SW ₁ shown in FIG. 7 is closed to give priority to the high brightness side, and when the lever 100 is set to the "L" side , the switch SW ₂ in FIG. 7 is closed, setting the low brightness priority state. If you want to leave the selection of photometry output to the camera (hereinafter referred to as normal use state), click the “-” in the center.
If you leave it in the position shown in Figure 7, switch SW ₁ ,
and SW ₂ remain open and neither state is set.

The shift circuit 24 receives a signal P _H from the selection circuit 19 for selecting and controlling the first photometric output (photometric output on the high brightness side) and the second photometric output (average photometric output).
A signal P _M that selects and controls the third photometric output (photometric output on _the low brightness side)
and a control signal q _H that opens the gate of the first photometric output and a control signal q _M that opens the gate of the second photometric output according to inputs from the first setting means 25 and the second setting means 26. , and a control signal q _L that opens the gate of the third photometric output.

FIG. 5 shows the configuration of the shift circuit 24. It is a switch that closes when the lever 100 of switch SW ₁ is set to the "H" side, and is pulled up by resistor R ₁ . The switch SW ₁ and the resistor R ₁ constitute a first setting means 25 for shifting to the high brightness side. 1st
The output shift signal SH of the setting means 25 is "1" in normal use, and becomes "0" when shifting to the high brightness side. The switch _SW2 is a switch that closes when the lever 100 is turned to the "L" side, and is pulled up by a resistor _R2 . Switch SW ₂ and resistor R ₂
constitutes a second setting means 26 for shifting to the lower luminance side. The output of the second setting means 26, the shift signal SL, is "1" in the normal use state, and becomes "0" when shifting to the low luminance side.

Next, the operation will be explained.

(1) When the selection circuit 19 selects the high brightness side; P _H = "1", P _M = P _L = "0" (1). In normal use, SH=SL=“1”
Therefore, the output of only the AND circuit AND ₁ and the OR circuit DR ₁ becomes “1”, that is, q _H = “1”
Then, the gate circuit 15 opens and selects the first photometric output (photometric output on the high brightness side).

When the lever 100 is set to the "L" side and the shift signal is set to SL="0", the output of the AND circuit AND ₁ becomes "0", while the output of the inverter INV ₂ , the AND circuit AND ₃ , and the OR circuit OR ₂ becomes “1”, that is, q _M = “1”,
The gate circuit 16 opens and selects the second photometric output (average photometric output).

Incidentally, even if the lever 100 is set to the "H" side,
Only the outputs of the AND circuit AND ₁ and the OR circuit OR ₁ are "1" and the state of q _H = "1" remains unchanged.
That is, if high-luminance photometric output is selected from the beginning, no further shift is made to the high-luminance side.

(2) Next, when the selection circuit 19 selects the average photometric output; at this time, p _H = "0", P _M = "1", and P _L = "0" (2). Under normal usage conditions, SH=SL=
The output of only the AND circuit AND ₄ and the OR circuit OR ₂ becomes “1”, that is,
q _M = "1", the gate circuit 16 opens, and the second photometric output (average photometric output) is selected.

When the lever 100 is set to the "H" side, the first
The output of the setting means 25, shift signal SH="0"
Then, since the output of inverter INV ₁ becomes "1", the output of AND circuit AND and OR circuit OR ₁ becomes "1", that is, q _H =
It becomes "1" and selects the photometric output on the high brightness side.

When the lever 100 is set to "L", the output of the second setting means, the shift signal SL, becomes "0", and the output of the inverter INV ₂ becomes "1", so that the AND circuit AND ₆ and the OR circuit
The output of only OR ₃ becomes “1”, that is, q _L
=1, the gate circuit 17 is opened, and the third photometric output (photometric output on the low luminance side) is selected.

(3) When the selection circuit 19 selects the low brightness side; P _H = P _M = “0”, P _L = “1” (3), and under normal use, SH = SL = “1”. ”
Therefore, the output of only the AND circuit AND ₇ and the OR circuit OR ₃ becomes “1”, that is, q _L = “1”
Therefore, the photometric output on the low brightness side is selected.

When the lever 100 is set to the "H" side, the first
The shift signal SH= which is the output of the setting means 25 of
becomes “0” and the output of inverter INV ₁ becomes “1”
As a result, the outputs of the AND circuit AND ₅ and the OR circuit OR ₂ become “1”, that is,
q _M =1, and the average photometric output is selected.

On the other hand, even if the lever 100 is set to the "L" side, only the outputs of the AND circuit AND ₇ and the OR circuit OR ₃ remain "1", and the photometric output on the low luminance side is selected with q _L = 1. There is no further shift to the lower luminance side.

In addition, in the above embodiment, the first photometric output,
The third photometric output does not necessarily have to be Pmax and Pmin.

FIG. 6 is a block diagram of another embodiment of the invention.

In FIG. 6, in the appropriate photometric output generation circuit 14, the maximum value generation circuit 27 and the minimum value detection circuit 28
, but it was only added for the sake of explanation. This is because the first photometric output is the output Pmax of the maximum value detection circuit 27 and the output of the second photometric output generation circuit 12.
This is because the third photometric output is obtained by calculating the intermediate value between the outputs Pmin and Pmean of the minimum value detection circuit 28.

The luminance difference effect comparison circuit 29 is the maximum value detection circuit 27
output Pmax and output Pmin of the minimum value detection circuit 28
As input, the difference in brightness value ΔP (corresponding to the ratio of subject brightness when not logarithmically compressed) is calculated as ΔP=Pmax−Pmin (4), and the brightness difference ΔP is compared with a constant value α. The output of the comparison circuit 29 becomes "0" when ΔP≦α (5), and becomes “1” when ΔP>α (6) (α is a value of 1 [EV]).

In the first correction circuit 30, when the output of the NOR circuit NOR ₁ is "0", the correction value is 0 and the input and output are equal; however, when the output of the NOR circuit NOR ₁ becomes "1", the correction value δ _H is Addition is performed and the output of output point OVT ₁ is shifted to the high brightness side.

The second correction circuit 31 sets the correction value to 0 when the output of the NOR circuit NOR ₂ is "0", and makes the input and output equal. However, when the output of the NOR circuit NOR ₂ becomes "1", the correction value δ _L is subtracted, and the output point
Shifts the output of OVT ₁ to the lower brightness side.

The NOR circuit NOR ₁ receives the output of the brightness difference detection and comparison circuit 29 and the output of the first setting means 25 and controls the first correction circuit 30 . Similarly the NOR circuit NOR ₂
The output of the luminance difference detection and comparison circuit 29 and the output of the second setting means 26 are inputted, and the second correction circuit 31 is controlled.

The operation will be explained below.

First, when equation (6) holds, the NOR circuits NOR ₁ , NOR ₂
Since "1" is input from the luminance difference detection and comparison circuit 29, both outputs become "0", and both the first correction circuit 30 and the second correction circuit 31 perform no correction. At this time, by switching the lever 100, the photometric output is selected in the same manner as explained in the embodiment of FIG.

Next, equation (5) holds and the brightness difference detection comparison circuit 29
When the output of the NOR circuit NOR 1 becomes "0" and the shift signal of the first setting means 25 becomes "0" with the lever ₁₀₀ in FIG. ”, and the first correction circuit 30 shifts the brightness value by δ _H to the high brightness side. At the same time, since the second setting means 26 does not operate, the second correction circuit 3
The correction value of 1 is 0, and the correction value of the entire correction circuits 30 and 31 is δ _H (underexposure).

On the other hand, equation (5) holds, and the luminance difference detection comparison circuit 29
When the output of the NOR circuit NOR ₂ becomes "0" and the lever 100 in FIG. 1'', and the second correction circuit 31 shifts the luminance value by δ _L to the lower luminance side. At the same time, the first setting means 25 does not operate, so the correction value of the first correction circuit 30 is 0, and the correction value of the correction circuits 30, 31 as a whole is δ _L (overexposure).

In this embodiment, the shift circuit 24 is also operated simultaneously by the shift signals SH and SL, and therefore participates in the following operation. That is, when the lever 100 is set to the "H" side when equation (5) holds true, the second photometric output or the third photometric output, which had been selected up until then, becomes the first photometric output or the second photometric output, respectively. The output is reselected as the photometric output, and the correction value δ _H is added to it. Assuming that the first photometric output has been selected up to that point, the correction value δ _H is added to the first photometric output and shifted to the high brightness side. On the other hand, (5)
If the lever 100 is moved to the "L" side when the formula holds true, the first minimum value or second photometric output that was previously selected will be changed to the second photometric output or third photometric output, respectively. This is selected, and the correction value δ _L is subtracted from it to shift it to the lower luminance side. However, if the third photometric output has been selected until then, the correction value δ _L is subtracted from this third photometric output.

The reason why exposure correction caused by such an operation is not particularly problematic is because ΔP is small and there is not much difference between the preselected photometric output and the reselected photometric output. Here, the resulting exposure compensation amount is the addition and subtraction value of the difference in photometric output due to reselection and δ _H and δ _L , so when equation (5) holds, do not reselect the photometric output. Similar correction may be performed using only the correction values δ _H ′ and δ _L ′ of the correction circuits 30 and 31.

Equation (5) holds and the photographer moves the lever 100 to the "H" side when the main subject is in a high-brightness area and occupies a small proportion of one area to be divided and measured. be. At this time, the brightness value of the main subject is larger than Pmax, and it is insufficient to set the photometric output to the high brightness side, so a value δ _H (about 1 [EV]) was determined taking into consideration the film latitude.
The purpose can be achieved by shifting to the high brightness side.

Equation (5) holds true and the photographer moves the lever 100 to the "L" side when the main subject is in a low-brightness area and occupies a small proportion of one area to be divided and metered. be. At this time, the brightness value of the main subject is smaller than Pmin, and it is insufficient to set the photometry output to the low brightness side, so a value δ _L (1.5 to 2 [EV]) was determined taking into account the film latitude.
The purpose is achieved by shifting the brightness by the same amount to the lower brightness side.

FIG. 7 shows a circuit embodiment (in the case of an analog circuit) of the correction circuits 30 and 31 according to the present invention. The first correction circuit 30 includes an OP amplifier A ₁ , a constant current source I ₁₀ , a correction resistor R ₁₀ (for setting _δH ), an inverter INV ₁₀ and a FET
Q ₁₀ , the second correction circuit 31 includes an OP amplifier A ₁₁ , a constant current source I ₁₁ , a correction resistor R ₁₁ (for setting δ _L ),
Consists of inverter INV ₁₁ and FET Q ₁₁ .
FET when the output of NOR circuit NOR ₁ , NOR ₂ is “0”
Both Q ₁₀ and Q ₁₁ are on, and there is no addition or subtraction of correction values δ _H and δ _L. NOR circuit NOR ₁ is “1”, NOR circuit NOR ₂
outputs “0”, FET Q ₁₀ is off, FET
Since Q ₁₁ is on, the correction value δ _H is added. When the NOR circuit NOR ₁ outputs "0" and the NOR circuit NOR ₂ outputs "1", the FET Q ₁₀ is on and the FET Q ₁₁ is off, so the correction value δ _L is subtracted.

FIG. 8 is a block diagram of another embodiment of the invention.

The fourth photometric output generating circuit 41 inputs the average value Pmean, which is the output of the second photometric output generating circuit 12, and shifts the value to the high brightness side by a correction value δ _H.
Output Pmean+ _δH . The gate circuit 43 outputs the fourth photometric output when the output of the NOR circuit NOR ₁ is “1”.
Pmean+δ _H is transmitted to the apex calculation circuit 20.

The fifth photometric output generating circuit 42 receives the average value Pmean, which is the output of the second photometric output generating circuit 12, and shifts the value by a correction value δ _L toward the lower luminance side.
Output Pmean−δ _L. The gate circuit 44 outputs the fifth photometric output when the output of the NOR circuit NOR ₂ is “1”.
Pmean-δ _L is transmitted to the apex calculation circuit 20.

Note that when the brightness difference is small such that equation (5) holds true, Pmean+δ _H >Pmax (7) Pmean−δ _L <Pmin (8).

In normal use, when the shift signals SH and SL of the first and second setting means 25 and 26 are "1", the outputs of the NOR circuits NOR ₁ and NOR ₂ become "0", and the gate circuits 43 and 44 are not opened. , the output of the NOR circuit NOR ₃ becomes “1”, and the output of the AND circuit AND ₁₁ ,
Since one input of AND ₁₂ and AND ₁₃ becomes "1", the gate selected by the selection circuit 19 and the shift circuit 24 can be opened.

In addition, if there is a brightness difference greater than a certain value and formula (6) holds true, the output of the brightness difference detection comparison circuit 29 is “1”.
Then, the outputs of NOR circuits NOR ₁ and NOR ₂ are both “0”
The result will be the same as before.

Now, when the lever 100 is set to the "H" side and the high brightness side is selected in a state where equation (5) holds true, the shift signal of the first setting means 25 becomes S _H = "0",
The output of the brightness difference detection comparison circuit 29 also becomes "0",
The output of the NOR circuit NOR ₁ becomes “1”. Then, the output of the NOR circuit NOR ₃ becomes “0” and becomes an AND circuit.
The outputs of AND ₁₁ to AND ₁₃ are all “0” and the first to
The third photometric output is no longer selected, the gate circuit 43 is opened, and the fourth photometric output Pmean+δ _H is transmitted to the apex calculation circuit 20.

On the other hand, when the lever 100 is set to the "L" side and the low brightness side is selected in a state where equation (5) holds true, the shift signal of the second setting means 26 becomes SL="0",
The output of the brightness difference detection comparison circuit 29 also becomes "0",
The output of the NOR circuit NOR ₂ becomes “1”. Then, the outputs of the AND circuits AND ₁₁ to AND ₁₃ are all "0", the first to third photometric outputs are not selected, the gate circuit 44 is opened, and the fifth photometric output Pmean-δ _L
is transmitted to the apex calculation circuit 20.

With the above configuration, the same effects as in the case of FIG. 6 can be achieved.

Note that the fourth and fifth photometric output generation circuits 41 and 4
The output of 2 is shifted based on Pmean, but if the luminance difference is small such that equation (5) holds true, there is a relationship of PmaxPmeanPmin (9), and only a slight change in δ _H and δ _L is required. in,
Of course, it may be shifted based on Pmax and Pmin.

As described in detail above, the present invention allows one of a plurality of photometric outputs to be selected when performing exposure compensation when there is a large difference in brightness in the subject, making it possible to perform exposure compensation with a simple configuration. can. Furthermore, since the plurality of photometric outputs mentioned above exist between the photometric output corresponding to the maximum value of the plurality of photoelectric outputs and the photometric output corresponding to the minimum value of the plurality of photoelectric outputs, it is possible to As described above, even if any one of the photometric outputs is selected, a sufficient exposure correction effect cannot be obtained. However, in the present invention, when performing exposure compensation when the brightness difference in the subject is small, a predetermined value is added or subtracted from one of a plurality of photometric outputs, and exposure compensation is performed based on the added or subtracted output. Therefore, sufficient exposure compensation can be performed even if the brightness difference is small.

[Brief explanation of drawings]

Figures 1 a to c are diagrams showing brightness levels, Figure 2 is a schematic diagram of the photometric optical system of the present invention, Figure 3 is a diagram showing multiple regions of the light receiving element, and Figure 4 is a diagram showing the present invention. FIG. 5 is a block diagram showing an embodiment of the invention, FIG. 5 is a diagram showing a shift circuit and setting means, FIG. 6 is a block diagram showing another embodiment of the invention, and FIG. 7 is a diagram showing a correction circuit according to the invention. FIG. 8 is a block diagram showing another embodiment of the present invention. [Explanation of symbols of main parts], Photometric device...10,
Appropriate photometric output generation circuit...14, selection circuit...1
9, Detection circuit...29, Indication circuit...24,2
5, 26, correction circuit...30, 31.

Claims (1)

[Scope of Claims] 1. A photometer that measures light by dividing a field into a plurality of regions and generates a plurality of photoelectric outputs corresponding to each region, and a photometer that changes according to the magnitude of the plurality of photoelectric outputs and appropriate photometry capable of generating a plurality of discrete photometric outputs existing between a photometric output corresponding to the maximum value of the plurality of photoelectric outputs and a photometric output corresponding to the minimum value of the plurality of photoelectric outputs. output generating means; detecting a brightness distribution state corresponding to each of the regions of the object based on the plurality of photoelectric outputs, and outputting one photometric output suitable for the brightness distribution state to the plurality of discrete photometric outputs; a detection/selection means for automatically selecting from among; a multi-photometric exposure control device that performs exposure control based on the selected photometric output; a detecting means for detecting a difference in size from the above; an instructing means for instructing overexposed or underexposed photography by manual setting; receiving outputs from the detecting means and the instructing means, and receiving outputs from the plurality of photoelectric outputs When the difference between the maximum value and the minimum value is larger than a predetermined value and there is an instruction from the instruction means, the exposure is changed according to the instruction from the instruction means instead of the photometric output to be selected by the detection/selection means. One photometric output that is over or under is selected from among the plurality of discrete photometric outputs, while the difference between the maximum value and the minimum value of the plurality of photoelectric outputs is smaller than a predetermined value and the instruction means When there is an instruction, instead of the photometric output to be selected by the detection/selection means, one of the plurality of discrete photometric outputs is set to a predetermined value according to the instruction from the instruction means. A multi-metering type exposure control device comprising: a correction means for outputting a value obtained by adding or subtracting a value; 2. In the device according to claim 1, when the difference or ratio is less than or equal to a predetermined value, the correction circuit performs the correction on the average output of the plurality of photoelectric outputs in accordance with an instruction from the indicating device. A multi-metering exposure control device that adds values. 3. In the device according to claim 1, when the difference or ratio is less than or equal to a predetermined value, the correction circuit adjusts the correction value to the maximum output of the plurality of photoelectric outputs in accordance with an instruction from the instruction device. A multi-metering exposure control device that is characterized by the addition of: 4. In the device according to claim 1, when the difference or ratio is less than or equal to a predetermined value, the correction circuit sets the correction value to the minimum output of the plurality of photoelectric outputs in accordance with an instruction from the instruction device. A multi-metering exposure control device that is characterized by the addition of: