JPH03252640A - Photometric display device - Google Patents

Abstract

PURPOSE:To clarity the reference of exposure correction by displaying an exposure value to be used for control as a deviation from an objective reference value based upon a photometric value. CONSTITUTION:A 1st photometric means 1 is an average photometric means e.g. and a 2nd photometric means 2 consists of a spot photometric means for finding out only a spot photometric value BVSP for instance. An exposure computing means 3 computes an exposure value EV to be used for control based upon the 1st/2nd photometric value. A display means 4 displays the exposure value EV found out by the means 3 by using a reference exposure value EVrf based upon the 1st photometric value BVAV or the 2nd photometric value BVSP as a deviation EV - EVrf. Thus, the reference of exposure correction can be made clear.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a photometric display device, which is used for photometric display of a camera that can measure the photometric distribution of a plurality of different photometric areas. be.

BACKGROUND TECHNOLOGY] Conventional photometric display devices for cameras such as those described above all display exposure values based on each photometric value as a deviation, with the exposure value used for control as a reference. For example, in the photometric display device disclosed in Japanese Patent Application Laid-Open No. 57-1.20924, each spot photometric value is displayed as a deviation from a control value based on a plurality of spot photometric values as a reference.

[Problems to be Solved by the Invention] However, when performing exposure compensation during photographing, the photographer tends to set the control value a predetermined number of steps over or under with respect to some standard. Professional and advanced photographers determine these standards based on their experience, but since these standards are not clearly displayed, they are not necessarily objective standards, but are based on the photographer's subjective standards. It was nothing more than Further, for beginners and intermediate users who do not have sufficient knowledge and experience regarding exposure compensation, the standards for exposure compensation are unclear, and therefore it is often not possible to obtain the finish that the photographer intended.

Furthermore, it is desirable to obtain the photometric value, which is the standard for displaying the deviation, using various photometric methods such as spot metering, average metering, and center-weighted metering depending on the intention of the photograph. The photometric display device disclosed in JP-A-57120924 has a problem in that only the spot photometric method can be selected.

The present invention has been made in view of these points, and its purpose is to provide a photometric display device that can display an exposure value used for control as a deviation from an objective reference value based on a photometric value. It's about doing. Another object of the present invention is to provide a photometric display device that can determine a reference value for displaying a deviation using various photometric methods different from the photometric value to be displayed as a deviation.

[Means for Solving the Problems] In the photometric display device according to claim 1, in order to solve the above problems, as shown in FIG. A first photometric means 1 that obtains a photometric value BVAv, and a second photometric value BVs2 based on a second photometric distribution.
a second photometric means 2 for calculating an exposure value EV to be used for control based on the first and/or second photometric value; The apparatus is characterized in that it has a display means 4 that displays the exposure value calculated by the exposure calculation means 3 using the exposure value EVrf as a reference as a deviation (EV - EV rf).

Note that, as in the invention according to claim 2, the first photometric value BV
The camera may further include a switching means 5 for selecting whether to use the exposure value based on the AV as the reference value for the deviation display or the exposure value based on the second photometric value BVsP as the reference value for the deviation display. preferable.

In the photometric display device according to claim 3, in order to solve the above problem, as shown in FIG. a second photometric value BVsP based on the second photometric distribution;
The second photometric value BVsP is characterized in that it has a second photometric value BVsP as a deviation from the first photometric value BVAv as a reference.

In addition, as in the invention described in claim 4, the first photometric means 1
It is preferable that the apparatus is provided with at least two photometric means and that the photometric value used as the reference value for displaying the deviation can be switched.

Further, it is preferable that the display means 4 is provided within the field of view of the finder.

[Function] Hereinafter, the function of the photometric display device shown in FIG. 1 will be explained. The first photometry means 1 is, for example, an average photometry means, and as shown in FIG. It includes peripheral photometry means for determining peripheral photometry value BVAM by photometering the entire screen AM except for AM, and means for calculating an average photometry value BVA from the spot photometry value Bvsp and peripheral photometry value BVA. The second photometry means 2 is, for example, a spot photometry means for obtaining only the above-mentioned spot photometry value BVsP. The exposure calculation means 3
and/or calculate an exposure value E■ used for control based on the second photometric value. However, when calculating the exposure value EV, the first
And/or in addition to the second photometric value, various data (for example, photographing magnification β, exposure correction value, etc.) may be used. The display means 4 displays the deviation (E V
-E Vrf). The mode of display may be numerical display or graphic display. The switching means 5 sets the exposure value EVrf, which is the reference for the deviation display, to the first
, or the second photometric value BVAv.
Select whether to decide based on VsP.

Note that in the embodiments described below, the photometric value BV used for control is displayed as a deviation from the reference photometric value BVrf.
The difference in adding film sensitivity SV to these means that the exposure value EV used for control is displayed as a deviation from the reference exposure value EV+(), so the photometric value may be used for display.

Further, in FIG. 1, in order to facilitate understanding, the first photometric value is the average photometric value BvAV, and the second photometric value is the spot photometric value BVsP, but the invention is not limited to these.

[Embodiment 2] FIG. 2 shows the circuit configuration of a camera as an embodiment of the present invention. In the figure, μC is a microcomputer (hereinafter referred to as "microcomputer"), which performs exposure calculations, exposure control, and sequence control of the entire camera. Microcomputer μC
is connected to various peripheral circuits and can exchange information with these peripheral circuits.

LMC is a photometry circuit that performs TTL photometry, and its photometry range extends from the center SP of the shooting screen as shown in Figure 3.
It is divided into two areas: AM and the entire screen AM excluding the center of the photographic screen, and the area ratio of these two areas is set to 1:8. The photometry circuit LMC is located at the center of the shooting screen.
Measure P to find the spot photometric value BVsp)
It has a peripheral photometry function that measures the entire screen AM except for the central part of the photographic screen and obtains a peripheral photometry value BvAM.

Information on the spot photometric value BVsP and the surrounding photometric value BVAM is converted into digital quantities and then transmitted to the microcomputer μC.

The DSP is a display circuit that receives non-table data from the microcomputer μC and displays the necessary information in the viewfinder. The display contents will be described later.

DDR is an exposure control circuit, which controls the aperture and shutter as well as film winding based on the aperture value and shutter speed calculated by the microcomputer μC.

The LEC is a lens circuit built into the photographic lens, and transmits lens data unique to the photographic lens to the camera body. The contents of the lens data include, for example, the maximum aperture value A
There are Vo, focal length f, distance data Dv, etc.

The ISO has a film sensitivity reading circuit which reads film sensitivity information recorded on the film cartridge or a semiconductor memory attached to the cartridge and transmits it to the microcomputer μC. This information is used for AE calculation in the microcomputer μC. Note that this circuit ISO may be equipped with a manual operation member (push button, dial, etc.) so that the film sensitivity can be manually set and changed.

Each of the input ports PO-PLO of the microcomputer μC is pulled up to a "High" level by a resistor not shown in FIG. 8, and is connected to the ground level through a separate switch. When any switch is turned on, the corresponding input port becomes the "Lou+" level, and the microcomputer μC can determine whether each switch is 0N10FF. Each switch will be explained below.

S ] is a photographing preparation switch that is turned on by pressing down the first stroke of a release button (not shown), and when this switch is turned on, light metering and exposure calculation operations are started.

S AIEL is a state switch (
AE flock switch), and AE flock is performed only when this switch is ON.

SQ is a learning mode switch, which is a normally open switch, and is operated to feed back the current exposure correction value to the exposure value independently determined by the camera at the next exposure.

Srf is a status switch (photometry standard selection switch) for selecting whether the reference value for photometry display is the average photometry value or the spot photometry value, and when this switch is ON, the average photometry value is selected; When it is OFF, the spot photometry value is selected.

S2 is O by pressing down on the second stroke of the release button.
This is the release switch that is turned on, and this switch is turned on.
Then, the exposure control operation is started.

Sup is an up switch, and Sdn is a town switch, both of which are normally open switches. When a switch Sov, which will be described later, is ON, it becomes an up/town switch for setting an override amount.

SSP is a status switch (spot photometry switch) that is operated to perform spot photometry, and when this switch is ON, the camera is in spot photometry mode, and when it is OFF, it is in automatic photometry mode. In automatic metering mode, the scene of the subject is determined from the reference metering value BVr4, shooting magnification β, peripheral metering value BvAM, and spot metering value BVsP, and the exposure value is automatically set based on past exposure compensation trends for each scene. It is corrected to

Sov is an override switch for manually performing exposure compensation, and when the up/down switches Sup and Sdn are operated while this switch Sov is ONL, the override amount is operated up/down. Note that when this switch Sov is OFF, the up/down switches Sup and Sdn can be used to operate up/down other quantities, but since they are not related to the present invention, their explanation will be omitted.

SM is the main switch, and this switch SM is ON.
When OFF, the camera becomes operational, and when OFF, the camera becomes inoperable.

Among the above switches, when the main switch SM is turned ON or OFF, the pulse generator PG outputs “HiF”.
A signal changing from the "il+" level to the "Loud" level is input to the interrupt input terminal TNTI, and the microcomputer μC executes the SMINT flow shown in FIG. 4. In #1,
The state of the input port P9 is detected, and it is determined whether the main switch SM is ON or OFF. Main switch SM is OFF
If F, the microcontroller μC stops. Also, the main switch SM is turned on.
If N, all the flags, registers, etc. of the microcomputer μC are reset in #2, and for example, the exposure compensation value BV4 described later is reset.
is also reset here. However, E2PRO described below
M is not reset. After completing the reset process #2, the microcomputer μC stops.

When any of the above switches, the photographing preparation switch S1, the AE flock switch 5AEL, and the learning mode switch SQ, is turned on, the output of the AND circuit AN becomes "'Hi".
The signal changes from the gl+" level to the 'L oul' level, and this signal is input to the interrupt input terminal INT2, and the microcomputer μC executes the flow of S] and INT shown in FIG. First, the flag AELF indicating the AE block is reset (#5). Next, lens data unique to the photographing lens is read from the lens circuit LEC (#], O). This lens data includes at least the maximum aperture value A V o,
A focal length f and distance data Dv are included. Then, the imaging magnification β is calculated from the input focal length f and distance data Dv (#15).

2 Next, the spot photometric value BVsP and peripheral photometric value BVAM are input from the photometric circuit LMC, and the open aperture value A V o is added to each photometric value (#20.#22>.

Then, switch Srf detects whether the standard photometric value is a spot photometric value or an average photometric value, and if the spot photometric value is to be used, the spot photometric value BVsP is substituted for the standard photometric value BVrf, and the average photometric value is set as the average photometric value. If so, add the average photometric value B V AV-(B V
sp+ 8 B V AM) / Substitute 9 (#2
5 to #35). Next, the difference (B V AM BV 6p) between the peripheral photometric value BVAM and the spot photometric value BVsP is determined and set as the brightness difference ΔBV (#40). Then, from the photographing magnification β, the spot photometry value BVsP, and the peripheral photometry value BVAM, the multi-segment photometry value BVI is calculated using the following formula (#45
).

B V 1 = kB Vsp + (1-k) B VAM In the above formula, the coefficient k (< 1) is the spot photometric value BV
The weighting of sP and peripheral photometry value BVAM is a coefficient, which is set as follows in consideration of the size of the main subject estimated from the imaging magnification β.

If β≧1/]0, it is assumed that the main subject occupies the frame, and k=05 is set for center-weighted photometry.

If 1/10>β 1/40, it is assumed that the main subject is a little smaller than the above, and the ratio of the part included in the center to the part included in the peripheral area is higher, and k=0.6.

If 1/40 > 1/100 above β, it is assumed that the main subject is smaller and more likely to be included in the center, and k =
It is set to 0.8.

If 1/100>β≧1/150, the main subject becomes even smaller, but it does not necessarily fall into the central spot metering area, so k=0.4 is used to make the center weighting a little smaller. .

If 1/1.50>β, it is assumed that there is a high possibility that landscape photography is being taken, and k-0.2 is set for average photometry.

Next, the reference photometric value BVrf, the photographing magnification β, and the brightness difference Δ
The scene of the subject is determined from the BV, and the N exposure correction values ΔBVci stored for the scene are not read out (#50). In other words, the reference photometric value BVrf and the shooting magnification β
, and one combination of brightness difference ΔBV, one scene c (BVrf, βΔBV) is determined, and each scene c (BVrf.

N exposure compensation values ΔBV for each of β, ΔBV)
ci (i=1. . . , N) is stored. This exposure compensation value ΔBVci is determined by the E2F built in the microcontroller μC.
It is stored in the ROM (or E2PROM built into the IC card installed in the camera), and will not be erased even if the camera's main switch SM is set to ○FFI. #55
Now, the N exposure compensation values Δ read out from the E2PROM
Find the average of B Vci (i= 1,...N),
This is set as the correction value ΔBVc learned for that scene. Then, the correction value ΔBVc is added to the above photometric value BVI to obtain the automatic photometric value B2 (#60). This automatic light metering value BV2 is a light metering value that is predicted to provide an appropriate exposure for that scene, reflecting the learning results for the scene of the subject at that time.

Here, the scene of the subject will be explained. Book 5 The camera of the invention learns past exposure compensation trends, predicts the photographer's desired exposure compensation value ΔBVc, adds this predicted exposure compensation value ΔBVc to the photometric value BVI,
Light metering value BV automatically corrected to give proper exposure
However, this exposure correction value ΔBVc differs depending on the scene of the subject. For example, the direction of exposure correction may be reversed between frontlit scenes and backlit scenes.

Therefore, the spot photometric value BVSP and the peripheral photometric value BVAM
The brightness difference ΔBV is used to discriminate between a frontlit scene and a backlit scene. Further, it is thought that the tendency of exposure compensation is different for landscape scenes, portrait scenes, and close-up scenes. Therefore, these scenes are discriminated using the imaging magnification β. Furthermore, it is thought that the tendency of exposure correction is different between a high-brightness snowy mountain shooting scene and a low-brightness night shooting scene. Therefore, the reference photometric value BVrf is used to discriminate between high-brightness scenes and low-brightness scenes. Note that by dividing the photographic screen into a plurality of regions and combining the subject distance information and subject brightness information obtained for each region, it is also possible to determine a more complex scene of the subject.

Next, it is determined whether the spot photometry switch SSP is ON or OFF (#65). If the switch SSP is ON, it is spot photometry, so the spot photometry value BVsP is substituted for the final photometry value BV3. If the switch ssp is OFF, it is automatic photometry, so the automatic photometry value BV2 is substituted for the final photometry value BV3. (#70.

#75). Next, it is determined whether a flag AELF indicating AE flow is set (#80).

If the flag AELF is not set, the final photometric value BV3 is substituted for the photometric value BV6 before correction in #85, and if the flag AELF is set, #85 is skipped and the process proceeds to #90.

In #90, AE flock switch sAεL is ON or OFF.
Determine whether it is F. If this switch SAEL is ON, it is determined whether a flag AELF indicating AE block is set (#95). If the flag AELF is set, the process advances to #135.

Also, if the flag AELF is not set, #]
Proceed to OO, set flag AELF, calculate correction value BV5 as (BV2-BV6) in #102, and proceed to #135.

At #90, AE floater switch S AFL is OFF.
If it is F, it does not indicate AE flow, resets the flag A E I-F, and checks whether the override switch Sov is ON or O.
Determine whether it is FF (#1.05.#1.1.0).

If the override switch Sov is ON, it is determined whether the up switch Sup has changed from OFF to ON (#], 1.5). If the up switch Sup changes from OFF to ON, the predetermined value BVk (
For example, '/8EV) is added to the correction value BV4, and #135
Proceed to (#120). If the up switch Sup does not change from OFF to ON, the down switch Sdn
Determine whether or not the has changed from OFF to ON (#12
5>. If the town switch Sdn has changed from OFF to ON, the predetermined value BVk is subtracted from the correction value BV4, and the process proceeds to #135 (#130). When the override switch Sov is OFF in #11o, or #1.1
5. If the up switch Sup or the down switch Sdn has not changed from OFF to ON in #125, the process directly proceeds to #135 without changing the correction value BV4. #] In step 35, the determined correction value BV4 is added to the pre-correction photometric value BV6 to obtain the control photometric value BV.

Here, the difference between the correction values BV4 and BV5 will be explained. The correction value BV4 is an override amount that is manually set, and the up/down switch Sup is turned on while the override switch Sov is turned ON.

By operating Sdn, it can be increased or decreased in units of BVk. Since this correction value BV4 depends on the individuality and preference of the photographer, it generally varies depending on the photographer and the scene of the subject.

On the other hand, the correction value BV5 is a correction value that depends on the reflectance of the subject, and may vary depending on the photographer, but mainly varies depending on the scene of the subject. This correction value BV5 is set by performing AE measurement in the spot photometry mode, and corresponds to a 9 brightness difference between the spot photometry value BVsP and the automatic photometry value BV2 when performing AE measurement. Since the automatic photometric value BV2 is a photometric value that has been automatically corrected for exposure by scene determination, it is desirable that the automatic photometric value be an appropriate photometric value for any scene. However, the fact that the photographer selects the spot metering mode and performs AE photography for a certain scene means that the automatic metering value BV2 determined by the camera is not suitable for that scene. Therefore, in such a case, if the photographer wishes, it is necessary to learn the brightness difference between the AE-based spot metering value BVsP and the automatic metering value BV2 as the exposure compensation value for that scene. . For example, if you use automatic metering mode to take a picture of a person in a backlit scene before learning, the background will be brighter, so the person will often appear too dark. In such a case, select the spot metering mode, place the person in the sub-I to metering area, obtain the spot metering value BVsP, and use it for exposure control using the AE function. It is photographed like this. Then, the brightness difference between the spot metering value BVsP used for exposure at this time and the automatic 0 light value BV2 is calculated as the correction value B for the backlit scene.
If learned as V5, there is a high possibility that a person will be photographed with proper exposure even in backlit scenes in subsequent automatic metering modes. Note that when performing AE flash in automatic metering mode, the metering value BV6 before correction is the automatic metering value BV2.
Therefore, the correction value BV5 becomes 0.

Next, the process proceeds to #140 in FIG. 6, where it is determined whether the learning mode switch SQ has changed from OFF to ON. If this switch SQ changes from OFF to ON, it is determined whether a flag LMF indicating learning mode is set (#145). Then, if the flag LMF is set, it is reset; if it is reset, it is set, and the process proceeds to #165 (#150.#
155). Further, unless the learning mode switch SQ has changed from OFF to ON, the process proceeds to #165 without doing anything. In #165, a predetermined calculation is performed from the photometric value BV and film sensitivity SV to calculate the exposure value EV (that is, the combination of shutter speed TV and aperture value AV), and in #170, a display subroutine (described later) is executed. . When the display is finished, it is determined whether the release switch S2 is ON or OFF (#175). If the release switch S2 is OFF, the input port P10 determines whether the "I-1i g h" level is the "Loud" level (#205).

If the input boat PLO is at "High" level, this means that the shooting preparation switch s1, AE floater switch S AEL, and learning mode switch SQ are all OFF, and the process proceeds to #2°O, erases the display, and stops. If the input port P10 is at the 'Loud' level, this means that one of the photographing preparation switch S1, the AE flash switch SAEL, and the learning mode switch SQ is turned on, and the process returns to #1o in FIG. If the release switch s2 is ON in #175, exposure control is performed based on the shutter speed TV and aperture value AV determined in #165 above (#180). Thereafter, it is determined based on the flag LMF whether the learning mode is set (#185).

If the flag LMF is not set, it is assumed that the learning mode has not been set, and the process proceeds to #200.

If the flag LMF is set, the learning mode is set, so this flag LMF is reset and the learning mode is canceled (#190). Then, determine whether the spot photometry switch ssp is ON or OFF (#
191). If the switch ssp is OFF, it is determined that the mode is not spot photometry, and the process proceeds to #]95, where learning is performed, and the process proceeds to #200. If switch ssp is ON,
Assuming that it is spot metering mode, proceed to #192 and select A.
E floc switch S Determine whether AFL is ON or OFF. If the switch SAEL is OFF, the process proceeds to #200 and learning is not performed. If the switch S AFL is ON, the above correction value BV5 (=BV2-BV
6) as the exposure correction value BV4, and proceed to #195. #19
In step 5, the scene of the object is determined from the reference photometric value BVrf, the photographing magnification β, and the brightness difference ΔBV, the N correction values ΔBV c i stored for the scene are called, and the contents are updated by one. That is, i-2,...
, N, by substituting ΔBVci into Δ3-BVcB-11 in the same order, the oldest input correction value ΔBVC1 is deleted, and the above exposure compensation value BV is
4 is input as the newest correction value ΔBVCN. Then, the process proceeds to #200, the display is erased, and the process is stopped.

Next, the content displayed by the display circuit DSP is shown in FIG. 8(a).
This will be explained by (f). Figure 8 (,) shows the display circuit D
This shows the state when all the segments that can be displayed within the field of view of the finder are displayed by SP. In the figure, 10
shows the shooting screen seen when looking through the viewfinder of a single-lens reflex camera. In order to display on the photographic screen 10, the focus and focus of the finder optical system are
A guest-host type transmissive LCD (liquid crystal display) is placed on the screen. The display within this shooting screen will be explained. 11 is a mark displayed when learning mode is set. Reference numeral 12 denotes a spot photometry area, which is the same as the central part SP of the photographing screen shown in FIG. 13 is a 4 numerical value that represents the deviation from the reference value as an EV value, with O as the reference value. If the sign of the number is positive, it indicates overexposure; if it is negative, it does not indicate underexposure. 14 is a scale bar provided for each ('/2) EV. 15 is an index for displaying deviation;
Thirteen indicators are arranged at ('/2) EVW intervals along the scale bar 14, and as shown in FIG. You can individually select whether to display or not display the black triangular index.Next, 20 is a display section in the viewfinder displayed at the bottom of the photographing screen 10, and the control shutter It consists of a speed display section 21, a control aperture value display section 22, and an override display section 23. In the override display section 23, when exposure compensation is being performed, a "10" or "-'" surrounded by a square is displayed. ” symbol is displayed, and is not displayed when exposure compensation is not performed.

Hereinafter, various cases will be explained while showing specific display examples. FIG. 8(b) is an example of a display in a normal photometry state (only the photographing preparation switch S1 is ON), and the spot photometry area is not displayed because it is in automatic photometry mode. When the reference photometric value BVrf (spot photometric value BVsP or average photometric value (BVsp+8B VAM)/9) is taken as the origin of the scale bar (the point where the value is O), the photometric value in automatic photometry mode is calculated as the deviation from there. is displayed as a black triangular indicator. Also, on the outside of the shooting screen, the shutter speed and aperture value based on the metering value in automatic metering mode are displayed.

FIG. 8(c) is an example of a display when the spot photometry switch ssp is turned on and the spot photometry mode is selected, and a spot photometry area is displayed in the center of the photographic screen. When the standard photometry value BVrf is set as the origin of the scale bar, the spot photometry value is displayed as a deviation from it using a black triangular ``mm'' indicator, and the photometry value in automatic photometry mode is It is displayed as a white triangular 'Δ'° index.At this time, the average photometric value is selected as the reference photometric value BVrf, and if the spot photometric value is selected, the black triangular Pam ” will be displayed at the origin of the scale bar. Note that the control shutter speed and control aperture value based on the spot photometry value are displayed at the bottom of the photographing screen.

Figure 8(d) is an example of the display when the learning mode is set in the spot metering state and the AE flock switch S AEL is turned on, and a mark indicating the learning mode is displayed at the upper right corner of the shooting screen. ing.

When exposure control is performed in this state, the difference between the photometry value in the automatic photometry mode and the sub-I/photometry value is learned and fed back to the photometry value in the next automatic photometry mode.

Figure 8(e) shows override (
This is an example display when applying exposure compensation), and the reference metering value B
When Vrf (here, the average photometric value) is the origin of the scale bar, the overridden control value (exposure value used for control) is represented by the black triangle as the deviation from there.
Also, the spot metering value before override is displayed by blinking the white triangle “△”′ index.Here, the white triangle “△” This is when the °° indicator flashes.7 However, this indicator is not the photometric value in automatic metering mode, but
This is because it indicates a spot photometry value.

Note that a mark is displayed at the bottom right of the outside of the shooting screen to indicate that override is being applied to the negative side.

Figure 8(f) is an example of the display when override is applied in automatic metering mode, and when the standard photometry value BVrf (spot photometry value or average photometry value) is set as the origin of the scale bar, the deviation from there is shown. , the overridden control value is displayed as a black triangular indicator, and the light metering value in automatic metering mode before override is displayed as a white triangular ° "△°゛" indicator. Note that in the automatic metering mode, when the learning mode is set, a mark indicating the learning mode is displayed regardless of the 0N10FF of the AE floater switch SAEL.

In Figure 8(b) to (f), the shutter speed and aperture value for exposure control are all the same value, but these may change due to exposure correction or changes in the brightness of the subject. Needless to say.

8 Next, the above-mentioned display subroutine (#170) is shown in FIG. 7 and will be explained. When this subroutine is called,
Displays shutter speed TV and aperture value AV, B V 7
(-B V B Vrf) is displayed, and it is determined whether the exposure compensation value BV4 is 0 or not (#250 to #300).If the exposure compensation value BV4 is 0
If so, the override display of +" or "-"' is erased, and it is determined whether the spot photometry switch ssp is ON or OFF (#302, #305).

If the spot photometry switch ssp is OFF, the ``mm'' indicator mentioned above indicates the deviation of the automatic photometry value from the reference photometry value, so in #310, erase the ``△'' indicator, Proceed to #335. If the spot photometry switch SSP is ON in #305, the above-mentioned °°mu'' index indicates the deviation of the spot photometry value from the reference photometry value, so the automatic photometry value is different from the reference photometry value. In order to display the deviation as well, set BV8 (-BV2-BVrf) in #315.
Display an index of △″ at the location where , and proceed to #335.

If the exposure compensation value BV4 is not 0 in #300, an override of '-1-' (over) or '(under) will be displayed depending on the value of the exposure compensation value BV4 (#
320). And #325 spot metering switch s
Determine whether sp is ON or OFF. If the spot metering switch ssp is OFF in step #325, the above-mentioned ``mu'' indicator indicates the deviation of the exposure-compensated automatic metering value from the reference metering value, so the automatic metering value before exposure compensation is In order to display the deviation of the photometric value from the reference photometric value, the process proceeds to #315 described above.

In addition, if the spot metering switch Ssp is ON in #325, the above-mentioned ``mu'' index indicates the deviation of the exposure-compensated spot metering value from the standard metering value, so it is before the exposure compensation is applied. In order to display the deviation of the spot photometry value from the standard photometry value, proceed to #330 and select BV8 (=
BV3-BVrf) is displayed with a blinking ``8'' indicator, and the process proceeds to #335.As is clear from the above explanation, the ``8'' indicator is used for final control. Indicates the deviation of the photometric value from the standard photometric value, △′
” indicates the deviation of the automatic photometry value from the reference photometry value, and the blinking △“′ indicator indicates the deviation of the spot photometry value before exposure compensation from the reference photometry value.

In #335, it is determined based on the flag LMF whether the learning mode is set. If the flag LMF is 1, the learning mode is set, and it is determined in #340 whether the spot photometry switch ssp is ON or OFF. If the spot metering switch ssp is ON, AE is set in #345.
Determine whether the floc switch 5AEL is ON or OFF.

AE floc switch S If AEL or ON, #35
0 displays the mark indicating the learning mode, and if AE FLOTA SWITCH S AFL is OFF, the display of the mark indicating the learning mode is erased in #355, and #360 respectively.
Proceed to. Also, spot photometry switch ssp is #340.
is OFF, regardless of the state of the AE flock switch 5AEL, the process proceeds to #350 to display a mark indicating the learning mode, and when the flag LMF is not 1 in #335, the process proceeds to #355 to display the learning mode. Clear the display of the mark. #31 60, is the spot metering switch ssp ON or OFF?
If it is ON, the spot photometry area is displayed in #365, and if it is OFF, the display of the spot photometry area is erased, and the process returns.

Finally, among the variables used in this example, variables related to photometric values are restored below.

BV... Control photometric value BvsP... Spot photometric value BvAM... Surrounding photometric value B V AV"'Average photometric value - (B V sp+ 8
B V AM)/9ΔBVci...N exposure compensation values ΔBVc learned for a certain scene...Average value of the above B V1...Multi-segment photometry value=kBVsp+(1-
k) BVAMBV2...Automatic photometry value = BVl+ΔBV
cB V 3 ・,, final photometric value (BV2 or BVsp
) BV4...Correction value BV5 that depends on the personality of the photographer.
・・Correction value BV6 that depends on the reflectance of the subject ・Photometric value 32 before manual exposure compensation BV7 ・・Deviation BV8 for displaying the black index
- Deviation BVrf for displaying white index "Δ'...Reference photometric value for displaying deviation (BVsp or BVAV) BVk...Over" -9 ()' Minimum unit for amount setting ('
/REV) [Effects of the Invention] As described above, the photometric display device according to claim 1 is capable of displaying the exposure value used for control as a deviation from an objective reference value based on the photometric value. This has the effect of making it possible to clarify the standards for exposure compensation.

In the photometry display device according to the second aspect, since the reference value for displaying the deviation can be selected, the reference value for exposure compensation can be changed according to the brightness distribution of the subject or the intention of shooting. This has the effect of making it easier to reflect the photographer's intentions in exposure compensation.

In the photometric display device according to the third aspect, since the reference value for displaying the deviation can be obtained using a different photometric method from the photometric value to be displayed as the deviation, compared to the case where the same photometric method is used, Depending on the brightness distribution of the subject and the intention of photometry, it may be possible to measure the subject more accurately.

In the photometric display device according to claim 4, since the photometric method of the reference value for displaying the deviation can be switched,
The evaluation criteria for photometric values can be changed depending on the brightness distribution of the subject and the intention of photometry, which has the effect of more accurately photometering the subject.

In the photometry display device according to the fifth aspect, since the display means is provided within the field of view of the finder, there is an effect that the photometry result can be known while looking at the photographic screen.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of the present invention, FIG. 2 is a block circuit diagram of a camera as an embodiment of the present invention, FIG. 3 is an explanatory diagram of the photometry area σ), and FIGS. Figure 7 shows flowchart 1 for explaining the operation of the same as above, and Figure 8 (
a) to (f) are explanatory diagrams of the display in the finder same as above. 1 is a first photometric means, 2 is a second photometric means, 3 is an exposure calculation means, 4 is a display means, and 5 is a switching means.

Claims (5)

[Claims] (1) A first photometric means that obtains a first photometric value based on a first photometric distribution; a second photometric device that obtains a second photometric value based on a second photometric distribution; and/or an exposure calculation means that calculates an exposure value to be used for control based on the second photometry value, and a deviation of the exposure value calculated by the exposure calculation means with respect to the exposure value based on the first or second photometry value. What is claimed is: 1. A photometric display device comprising: display means for displaying a photometric display device. (2) A switching means for selecting whether to use the exposure value based on the first photometric value as the reference value for the deviation display or the exposure value based on the second photometric value as the reference value for the deviation display. The photometric display device according to claim 1, further comprising: a photometric display device; (3) a first photometric means that obtains a first photometric value based on a first photometric distribution; a second photometric device that obtains a second photometric value based on a second photometric distribution; A photometric display device comprising: display means for displaying a second photometric value as a deviation based on a photometric value. (4) The photometric display device according to claim 3, wherein the first photometric device includes at least two photometric devices, and is capable of switching a photometric value serving as a reference value for displaying the deviation. (5) The photometric display device according to any one of claims 1 to 4, wherein the display means is provided within the field of view of a finder.