JPS5946635A - Exposure controlling system of error compensation of exposure measurement at open aperture in lens interchangeable camera system - Google Patents

Abstract

PURPOSE:To compensat the photometric error, by outputting an error signal, which corresponds to a photometric error peculiar to a camera body, in accordance with the combination between plural kinds of camera body and interchangeable lenses, and selecting error data required for the camera body on the camera body side. CONSTITUTION:A clock pulse of a circuit 1 is inputted to the side of a lens I . An address designating circuit 2 designates three specific addresses of an ROM3. Three kinds of error data of exposure measurement at open aperture are stored fixedly there. These data correspond to errors obtained when a lens is set to three kinds of camera body. Three error data of three addresses are outputted successively from a converting circuit 4 in series and are converted to parallel data by a circuit 5 of a body side II. Only one error data required for the body side II is selected from these data by a selecting means 6. The output of a circuit 7 for exposure measurement at open diaphragm is an object luminance and an open diaphragm value. This data of exposure measurement at open diaphragm and said error data are inputted to an eliminating circuit 8, and error components of exposure measurement at open aperture are eliminated by operation, and the result is inputted to an exposure operating circuit 9. An exposure time and an aperture value based on the photometric output are outputted by the operation in the circuit 9.

Description

[Detailed Description of the Invention] Technical Field This invention relates to a TT in an interchangeable lens camera stem.
For more information on the exposure control method using I-photometry, see
The present invention relates to a correction method for the aperture photometry error.

The photometric output characteristics of a conventional TTL photometric camera with interchangeable lenses depend on the optical system of the interchangeable lens (i.e. exit pupil diameter, exit pupil position, etc.) and the camera body optical system (i.e. the position of the light receiving element and the film surface). and the optically equivalent position, the diffusivity of the light incident on the light receiving element, etc.). That is, when various interchangeable lenses are attached to a camera body of a certain photometric optical system, even if a subject having the same brightness is photometered, the photometric value on the camera body will show a different value for the interchangeable lens.

Therefore, accurate exposure control cannot be performed unless this difference in photometric values is corrected. Generally, the difference between these photometric values (i.e., photometric error) is determined by the difference between the photometric values (for example, 50vrra/I”).
], 4) is taken as the reference photometric value, and is expressed as the difference between this reference photometric value and the photometric value when other interchangeable lenses are attached.

Various means for correcting such photometric errors have been proposed in the past, but they can be broadly classified into the following two types. First, the first type of model is, for example, Japanese Patent Application Laid-Open No. 56-10722.
As shown in No. 1, each interchangeable lens is provided with a signal means having a signal corresponding to the photometric error, and the signal from this signal means is read by the camera body to correct the photometric value. . Note that this signal means may be configured so that the signal directly indicates the value of the photometric error, or may be configured so that the position of the transmission means for transmitting the setting aperture signal to the camera body is adjusted by an amount corresponding to the photometry error. There is a constructed one. In addition, the second type of model is based on information on the maximum aperture value or focal length given by an interchangeable lens, for example (as shown in J. Based on this, the camera body calculates photometric error data, and uses this data to correct the photometric value.

However, as mentioned above, the value of photometry error differs depending on the combination of the optical systems of both the interchangeable lens and the camera body, so not only when different interchangeable lenses are attached to the same camera body, but also when different lenses are attached to the same camera body. Even in the case where the same interchangeable lens can be attached to a plurality of types of camera bodies having different photometric optical systems, the light value differs from camera body to camera body.

Therefore, in the conventional example described above, the following problems arise. First, in the first type of model, usually only one type of photometry error signal corresponding to the camera body with a specific photometry optical system or a signal means of each interchangeable lens is manually inputted, When this interchangeable lens is attached to a camera body, the signal means does not have a corresponding photometric error signal, so the photometric value is not determined as jF,L.

In order to solve this problem, it is possible to make the photometry optical systems of all the multiple types of camera bodies that can be attached to interchangeable lenses the same, but if they are made the same, the design flexibility and the specifications regarding the photometry characteristics of the camera bodies may be affected. As a result, the price of the camera itself increases, making it impractical. In addition, in the second type of model, it is very difficult to accurately calculate a large number of supplementary JE data corresponding to each of a large number of interchangeable lenses on the camera body side because the calculation circuit is complicated. As described below, photometric values are corrected based on rough data.

In other words, when correcting photometry errors according to the aperture value information, conventional devices only make a certain amount of correction corresponding to the diameter of the exit pupil of the interchangeable lens, and do not make any correction corresponding to the position of the exit pupil. Not done. Next, when correcting photometric errors according to focal length information, conventional devices only perform a certain amount of correction corresponding to the position of the exit pupil of the interchangeable lens; has not been done at all.

Purpose The present invention provides a signal output device for an interchangeable lens that can correct photometry errors on the front and has a simple configuration in interchangeable lenses that are attached to multiple types of camera bodies with different photometry optical systems. It is.

Summary The present invention provides a frame that corresponds to the amount of photometry error that is uniquely determined for each camera body depending on the combination of the photometry optical system of the camera body and the optical system of the interchangeable lens, which have different photometry optical systems. In this system, multiple error signals can be outputted from the signal means on the interchangeable lens side, and all of these multiple error signals are transmitted to the camera body to which the camera body is attached, and the camera body side is selected from the camera body side. be.

Example FIG. 1 is a block diagram showing the basic configuration of the present invention.

The lens (I) to the right of the dashed-dotted line is the interchangeable lens, and the (river) to the left of the dashed-dotted line is the camera body.

(1) is a circuit that outputs a clock pulse for reading error data from an interchangeable lens, and data of three types of open photometry errors are fixedly stored in three specific addresses among a plurality of addresses of this clock.

When this lens is attached to a camera body of the J-th type, this corresponds to the error when the lens is attached to a camera body of the second type.

The three error data are sequentially output. This output data is sequentially output in series from the parallel/serial conversion circuit (4) based on the clock pulse from the camera body (river).This data is sent to the camera body via terminals (J3) and (J4). (All data is input to Ifl, and serial/parallel conversion circuit (5) sequentially converts it into parallel data in synchronization with the clock pulse from (1). Of these three error data, one camera body ) is selected by the selection means (6) and sent to the removal circuit (8).
) is output to. For example, in the case of the second type of camera body, the error data Δvc2 is input to the removal circuit (8). Other error data AVCI that was not selected,
AVC3 is not used in this camera body. (The power is an open photometric circuit, and this output is Bv-Avo-Avc
2 (13v: subject brightness, A, vo: open aperture value). This open metering data old r -Avo -Av
c2 and the error data Avc2 read from the lens are input to the removal circuit (8), and (Bv −Avo −AVC2)+AVC2=
13v-Av.

The aperture metering error component Avc2 contained in the aperture photometry output is removed by calculation and inputted to the outside of the exposure calculation circuit (9). Then, the exposure calculation circuit (9) performs exposure calculation and outputs the exposure time and aperture value based on the photometry output, and this output is sent to the display circuit (1o) and the exposure control circuit (11).
sent to. In addition, when selecting the error data necessary for the camera body in section 6, use a register that appropriately latches various data from the interchangeable lens that appears in the serial/parallel conversion circuit (5). When necessary error data appears in the serial/parallel conversion circuit (5), the output of the conversion circuit (5) is latched into a register whose contents are scheduled to be read by the removal circuit (8). It's good to pass.

FIG. 2 is a block diagram showing an interchangeable lens camera system to which the present invention is applied.
E C) or the circuit on the lens side, and the rest are. When this power switch (MAS) is closed, the power line (10E)
Power is supplied from the microcomputer (hereinafter referred to as t-com) (MCO) and oscillator (OSC), and /4-coin (klCO) is reset. Also, the clock pulse from the oscillator (OSC) or the clock terminal (CL
). Furthermore, this clock pulse is used by the exposure time control circuit ('I゛IC) and the aperture control circuit (APC).
), release circuit (RLC), mirror release circuit (M
RC).

(LMS) is a photometry switch that is closed when the release circuit (not shown) is pressed down, and this switch (1-
When MS) is closed, the output of the inverter (IN50) becomes 'High', and μm Coin (MC
The 'Ilight' signal is transmitted to the interrupt terminal (its) of O). When μmcom (MCO) becomes the input terminal (its) or 'I-1i gh'',
The output terminal (01) is set to ``VHigh'', the output of the inverter (IN52) is set to +VLOw'', the transistor (BTs o ) is made conductive, and the oscillator (OSC) on the camera side is connected from the power supply line (+ to l). μmco
In addition to supplying power to the circuits except m (MCO), the buffer (B F ), terminal (JB'l), (JLl,)
Power is supplied to the circuit (LEC) on the interchangeable lens side via a power line (-1-Vl'').

When the transistor (BTso) becomes conductive and power supply from the power supply line (10V) starts, the power-on reset circuit (1'OR2) operates and the exposure time control circuit (TIC), from the terminal (PO2), Aperture control circuit (Δ
l) C), the release circuit (RL C), and the mirror release circuit (MRC) A heli-set pulse is sent to reset these circuits.

(LMC) is a photometry circuit, and this photometry output (analog) Bv-AvO-AVC (Bv; subject brightness,
Avo: open aperture value, Avc: open photometry error) is μm
c Qm (MC; 0) is input to the A-1) conversion analog input terminal (ANI). Further μmcorn
The input terminal (RE V ) of (M, CO) is μm
com (M) This is a terminal for inputting the reference potential of the converter to I)- provided in the CO, and this terminal receives the reference potential from the constant voltage source provided in the photometry circuit (LMC). It has been entered.

("r l S) is a device that outputs the data of the set exposure time, and this set exposure time data is μmCOmC
The input capo-1-(IPI) of 0n1() is input.

(APS) is a device that outputs the data of the set aperture value, and this set aperture value data is μmcom (MC0)
is input to the input port (IF5).

(F'SS) is a device that outputs the data of the set film sensitivity, and this set film sensitivity data is
com (MCO) input port (IF3). (MI) S) is a device that outputs data corresponding to the set exposure calculation mode, and the data from this device is sent to the μmcom (MCO) manual port (IF5).
has been input to. (D S P ) is a display circuit for displaying exposure control values and the like, and the display contents are controlled by a common terminal (COM) and a segment terminal (SEC) from μmcon (M CO ).

The output terminal (03) of μmcom (M CO) is terminal 0.
B3) (JL3) to the lens side counter (CO
so) (CO52) reset terminal (it E)
It is connected to the. This output terminal (03) is a counter (COso) that reads 'I-1i gh' while reading data from the interchangeable lens.

(CO52) is released from the reset state. μm
The terminal (SIC) of com (Pv+co) is the terminal (
This is a terminal that outputs a synchronizing tarok pulse when reading data serially to (SID).
As mentioned above, is a serial input terminal for reading data input manually in series. Then, the terminal (SIC:) is connected to the counter (CO) via the terminals (JB2) and (JL2).
50) Connected to the clock input terminal (cr-), and the terminal (S11) is connected to the terminal (JL5), (JB5)
The )]1 output terminal of the OR circuit (ORso) is connected through the .

FIG. 3 shows an example of a circuit of a serial data reading unit provided in μmcom (M CO) related to the terminals (SIC) and (s]D) mentioned above. FIG. 4 is a time chart showing the operation of the circuit shown in FIG. 3. In Fig. 3, the serial data read command (S-11N) (Fig. 4, 5
11N) or 71J Tsubu flop (l・I・”S
O) is set (FF50Q in Figure 4), and the clock pulse (DIG) obtained by dividing the clock pulse of the ant circuit (AN7o) and the oscillator (O8C) within the μmcom (MCO) is output from the terminal (SIG). (FIG. 4 SIC) and this AND circuit (AN70)
The clock pulse from the 3-bit binary counter (C060) is input to the clock terminal (CI-) of the Ezo's bit shift register (Sl(so)). -) every time the clock falls to
It takes in data from the terminal (SII).

Then, when the 8th clock pulse rises, the carry terminal (CY) of the counter (CO60) becomes 'Hi'.
When the 8th clock pulse falls, the output of the AND circuit (AN72) rises to 'I-1i gh'' (Figure 4: AN7).
2). This allows the flip-flop (1''I”
5o) and the counter (CO60) are reset (FIG. 4, FF50QCY), and the tooth row data input flag (SIJ"L) is reset to 'l-1ig'.
h'' (FIG. 4 SIF'L) to complete the operation.

Returning to Figure 2, the switch (RLS) is a release switch that is closed by the second step of pressing the release button, and the switch (EXS) is a release switch that is closed by the second step of pressing down the release button, and the switch (EXS) is a release switch that is closed by the second step of pressing the release button. This switch is closed when the exposure control operation is completed, and is opened when the preparation (charging) of the exposure control operation of the exposure control mechanism and structure is completed.

When the charging of the exposure control mechanism is completed, the switch (EXS
) is open, and the output of the inverter (IN56) is low.
When the release switch (RL S ) is closed in the “ow” state, the output of the AND circuit (AN60) becomes “High”.
It becomes h″.

The output of this AND circuit (AN60) is μm com
(λ4GO) is connected to the interrupt terminal (iL2), and μmCOnmC0n1 (is connected to the interrupt terminal (iL2) of
(MCO) starts an operation for exposure control no matter what operation is being performed. On the other hand, if the exposure control mechanism is not fully charged and the switches (J to XS) are closed and the output power of the inverter (IN56) is 4' High, then the release switch (RLS) is closed. Even if the output of the AND circuit (AN60) is
(p-com (MC0) does not perform any operation for exposure control.

Output port (OPI) of μmC0ITI (M CO)
is the exposure time control circuit (T'IC).
The output port (OF2) outputs the throttle control ω]1 circuit (A I)C) and the stage number data Av.
-Avo is output, the output terminal (02) outputs a pulse for starting the Numakawa control operation to the release circuit (RI=S), and the output terminal (04) is output to the mirror release circuit (MR
A pulse for starting the mirror up operation is output to C). In addition, the input port (IP+
)>(JP4), output port (OPI), (O
F2) is replaced with a common data bus and μmcom (
M CO ) and data input/mountain (1-J S ) + (A
PS), (FSS), (Ml)S), (T'IC) (A
Data may be transferred to and from PC on a time-sharing basis.

Next, in the lens side circuit (LEC), the counters (COso) and (CO52) are each 3-hit binary counters, and the counter (050) is a clock pulse pulse from the terminal (SIC). The counter (CO52) counts the doubles and the counter (CO52)
Count the falling edge of the carry terminal (c'i') of so). Counter (CO50) 3 pins)・
The output (h 2 :), (+11) (hO) is input to the decoder (DEso), and this decoder (J
)E5o) outputs the signals shown in Table 1 in response to the data from the counter (COso).

Table 1 Output of 3 hits of counter (CO52) (g3),
(g2).

(gl) and (go) are input to the decoder (DIbe52), and the decoder (I)E52) is input to the counter (CO52).
) outputs the signals shown in Table 2 according to the data from.

Table 2 Among the outputs of the decoder (1) E5z), the terminal (c3) is connected to the select terminal (Slo) of the data selector (MPso), and
50) When the terminal (g3) is “Low”, it is the input data from the input section (γ1), 'Ili gh''
When , the input data from the human power section (γ2) is stored in the ROM.
(rtoso) output as address data.

In the input section (γ1), the negative 5 bits are connected to ground, and the lower 3 bits are connected to the output terminal (g2) of the decoder (1) & s2).
), (g]), and (go) are connected.

Therefore, the address of ROM (ROso) is the counter (CO52) (D output? '000' ~ '11
0" is between "00000000" and "00000]
10"° is specified sequentially. The input section (γ2) is specified by the output terminal (g) of the decoder (1)
2), (g+), (go) are connected, and the lower 5
The bits are input with data from a code plate (C01) linked to the focal length setting unit (not shown) of the zoom lens. Therefore, the address of R01vl (Ru5O) is output from the counter (CO52) as '111
”, the address “001φφφφφ” is specified. Here, “φφφφφ” indicates the direction of the code plate (COD).

Next, the data written in each address of the ROM (Ru2O) will be explained with reference to Table 3.

Table 3 The address ``OOH'' (11 indicates a hexadecimal number) stores data such as F8H' for a zoom lens and 1.Qll for a fixed focus lens, and the camera side stores the following data: If it is determined that no data has been read, it is determined that no interchangeable lens is attached, and exposure control is performed in aperture metering mode. On the other hand, if it is determined that any of the above data has been read, exposure control is performed in open metering mode.

At the address "Q]H", data of the open aperture value Avo is stored.

At the address "02+4'", data of the maximum aperture value Avmax is stored.

"Q:3H" contains data on the focal length of a fixed focal length lens, and variable focal length 1?1? If it is a long distance lens, the data for the shortest focal length is stored.

"Q 3 +("I 1lo4.,'I, "051
(" stores data on the open photometry error of this interchangeable lens for each of the three types of camera bodies.

Next, the zoom lens is "00100000" ~
Focal length data corresponding to data from the code board (COO) is stored at the address "001 ] 111 ]", and this data is used to determine camera shake warning.

FIG. 5 is a timing chart showing the operation of reading data from the lens. The operation of reading data from the lens in FIG. 2 will be described below based on the timing chart in FIG. 5. First, the output terminal (03) of μm com (M CO) becomes 'Ili gll'' and the counter (COs o ) (COs 2 ) is reset or released. The clock terminal (SIC) of μm com - (M CO) From then on, as explained based on FIG. 3, Section 4.1, eight clock pulses are output every time one hide's data is read.At the step SO where the first data is read, ζ1 r< OM
) is specified as the address “ooooooooo”, so the check data “’FQH’” or “-x, s
HI+ is output, and the decoder (I)1ヱ50) outputs the terminal (e) as the count of the counter (COso) progresses.
O) to (e7) are set to 'High' in sequence, and the gate opening ROM (R
The data from the output terminals (fO) to (f7) of the
), terminal (J 1..5).

0B5) to the serial input terminal (s The data to the input terminal (SJl) at the falling edge of the 7th clock pulse is μm com (M CO).
The data is read into the internal shift register (5R5o).

When the 8th clock pulse is input to the counter (CO5o), this pulse rises and the carry terminal (
cy) or 'I-1i gh'', and θthis Sl
Move to step and meat grinding clock pulse is input,
When this clock pulse rises, the carry terminal ((:
Y) falls to 1Low'', and the counter (co52) increments by one at this fall.

And ROM (ROso) is data selector (M
Pso) Human Resources Department (γ1) to 771) ”000
00001" address is specified.

Repeat the same operation up to 56 steps, R,
OM (l(OsO)'s at1/s'OOH'
The data fixedly stored in "~"06H" is μmc
o+n (hi G O). When the carry terminal (cy) goes low at the end of step S6, the output of the counter ((, Ds2) becomes 111'
Therefore, the output of Tekota (1) I''X52 is '100
1". This causes the data selector (MP
50) is 001φφφφ from the human resources department (γ2)
Specify the address of φ°" (where the lower 5 bits 'φφφφφ'° are data from the code board (COI)),
The set focal length data stored at that address is read by μmcom (MCO) in the same manner as described above.

After completing reading the data for the zoom lens, connect the μm com (M CO) output terminal (03).
The counter (CO52) becomes LOW.
GO5o) is in a reset state. In addition, in the case of a fixed focus lens, when step S6 is completed, μmcom
The output terminal (03) of (MCO) becomes LOWLr and the counter (CO50).

(CO52) The lens enters the set state and data reading from the lens is completed.

FIG. 6 is a flowchart showing the operation of μmcom (MCO). Below, this flowchart I in Figure 6
・The overall operation of FIG. 2 will be explained based on.

When the photometry switch (LMS) is closed, the interrupt terminal (ic
An interrupt signal is input to l), μm com (M CO) starts operation, and at step #-1, (i[+)?'
The interrupt terminal (
When it+) becomes 'High', the output terminal (O]) is set to 'I-1i gh' in step #2, and the output terminal (15T) is turned on via the inverter (IN52).
50) is made conductive to start feeding power from the power supply line (-+-V), and also to start feeding power to the lens side (1, EC) via the buffer (BF). And, enter capo) (jPl), (IF5).

(IF3) + Setting data from (II'4) to 111
1-i order register Mo, Ml, 842. Import it into Ma and move on to step #7.

In step #7, the output terminal (03) is
h'' to release the reset state of the counters (CO50) and (CO52), and set 41 (in the k register. Then, in step #9, execute a serial data input command and input the data from the lens as described above. Start the capture operation and wait for the completion flag SII='I- to become l'.When the flag SII becomes low, the captured data is transferred to register Mk (initially N14). , and determines whether register k is 'An'. If k is not "A I", 1111+ is added to register k, and the process moves to step #15, where k or "Go" is set. If it is not "Go", return to step #JO and perform the next data import operation. A.I.”
When it is determined that it has become, in step #=13,
It is determined whether the contents of register M4 are 'F8H'.

Then, if "l"8H'" indicates that the fixed lens is attached or no lens is attached, there is no need to read any more data from the lens, and the process moves to step #1G. On the other hand, “r”8I
+” means that a zoom lens is attached: #2I 4., #]5, continue to import data, and in step #15 k is 'CHI+ If it is determined that the
is the discrimination code, M5 is AV01, M6 is Avmax, M', 7 is iw, Mg is the open metering error Ayc1 for the first type of camera, Mg is Avc2 for the second type, MA is is A for the third type
fS is set for vc3 and M+3.

At step A116, the terminal (03) is set to VLow" to reset the counters (CO50) and (CO52), and at step #17, the photometry circuit (LMC) is reset.
The output of A-1) is converted and the A-D converted data is set in register M (and the process moves to step #19. In step #19, the contents of register Mc are set l5v.
-Δ%IO-Avc2 in register M5. M9. M2
Contents Avo, AVC2, SXI are added to Te1 brother v
is calculated and set in register Mc. This example indicates whether it is a second type of camera, but if it is the first type, Mg
, if it is the third type, it is sufficient to add the contents of MA. #19
When step y is completed, the exposure calculation operation of step l#220 is performed.

When the exposure calculation operation is completed, flag LMF is set to 1 to enable interrupts, and flag RLF is set to 1 in step #23.
Determine whether or not. Then, if the flag RI-F is 1, the process moves to step #33, and if it is not 1, the process moves to step #24 to perform exposure display. The function of flag RL F will be described later.

In step #25, the light metering switch (LMS) is closed and it is determined whether the interrupt terminal (ict) is ``9'' or not. If (ice) is ``Higb'', the process returns to step #3. Repeat the operation from step.

On the other hand, in step #25, (i[]) is ""Low"
If it is determined that this is the case, the output terminal (01) is set to 'Low' in step #26, and the power supply from the power line (+■) and the power supply to the lens side (L J!: C) is stopped. .Then, the display is made blank, and the photometry flag LMT; is set to O to enable interrupts, and the μmcom (MCO) stops operating.

After charging the exposure control mechanism is completed, switch (J-,
With the release switch (RL
S ) is closed, the output of the AND circuit (AN60) becomes "I-l-1i" and the interrupt terminal (it2
) or J-1ight”. Then μm com (
Regardless of which step the MCO) is performing, it immediately moves to step 4421, determines which terminal is causing the interrupt, and moves to step #30. In this step, the release flag RL F is set to 1, and
In step 1, the output terminal (03) is set to 'Low' as a countermeasure in case an interrupt operation is performed while reading serial data, and in step -1\:32, the flag LMF is set. Determine whether it is 1 or not.

Since the calculation of the exposure control data is not completed unless the MF value is 1, the exposure control value is calculated by moving to the flow starting from #2. Since the release flag RL F is set to 1, the process returns to step #33.

If the flag LMF is 1 in step #32, the process immediately proceeds to step #33 and the control exposure time data Tv is sent from the output port (OPl) to the exposure time control circuit ("I"rC). ), the control aperture step number data Av - Avo is output from the output port (OP2) to the aperture control circuit (AI), and from the terminal (02) to the release circuit (R1, C) of the exposure control mechanism. Outputs pulses for

In step #36, wait for a certain period of time and connect the output terminal (0
4) Outputs the release pulse to the mirror up release circuit (8/IRC), the mist control operation is completed, the switch (EXS) is closed, and the input terminal (12) becomes 'High'. Wait for the input terminal (12).
When the profit becomes 1high, set the flag IζLF to O, move to step #25, and turn the photometering switch (L M
, S ) is closed, repeat the operation from step 4[3; otherwise, stop the power supply, turn off the display, set the flag x-M
) stops its operation and then waits for the light metering switch (LMS) to be closed and an interrupt signal to be input to the terminal (port 1).

Effects As described above, the present invention corresponds to the amount of photometric error determined for each camera body depending on the combination of the photometric optical system of the camera body and the optical system of the interchangeable lens, which have different photometric optical systems. Since multiple signals can be output from the signal means of the interchangeable lens to the camera body, even if this interchangeable lens is attached to another camera body with a different photometry optical system, it will always be possible to receive a signal with an appropriate amount of photometry error. Since the information is read by the camera body, exposure errors can be corrected accurately on the camera body, and there are no restrictions in terms of design freedom or specifications. Furthermore, since the signal of the photometric error amount is predetermined in the camera body, the photometric error can be corrected with a simple configuration without complicating the arithmetic circuit as in the conventional case.

Furthermore, all of the multiple types of error data stored in the interchangeable lens are sequentially transmitted to the camera body, and the error data necessary for the camera body is selected by the camera body and used for calculations. There is no need for a special configuration to select and transmit only the data from the interchangeable lens, and the advantage is that photometry errors can be corrected with a simple configuration and proper exposure can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of this invention, FIG. 2 is a block diagram showing the overall configuration of an interchangeable lens camera system to which this invention is applied, and FIG. 3 is a μ-com'
A specific example of the serial input section of (MCO), Figure 4 is a time chart 1 showing the operation in Figure 3, and Figure 5 is a time chart showing the data transfer operation from the interchangeable lens to the camera body in Figure 2. , FIG. 6 shows the μ-com (~1c
It is a flowchart which shows operation|movement of o). ■...Interchangeable lens, ■...Camera body, 3...RO
M, 2...Address designating means, 4...Error data transmission means, 1...Digital signal transmission means, 5...Error data receiving means, 6...Selecting means, 7...Open photometry means , 8...removal means, 9. ]1... Exposure control means.

Claims (1)

[Claims] 1. A ROM that fixedly stores open metering error data for each case when attached to multiple types of interchangeable lens camera bodies in addresses corresponding to each type of camera body, and a digital signal from the camera body. means for firstly specifying an address in which error data corresponding to each type of each type is fixedly stored; and a transmission means for sequentially transmitting the plurality of error data outputted from the specified address to the camera body. means for sequentially transmitting the digital signals for addressing to the interchangeable lens, and means for receiving and receiving the plurality of error data from the transmitting means of the interchangeable lens;
The receiver is the 97-; 1+Ly of the error data taken.
A means for metering the subject light that passes through the aperture or aperture of an interchangeable lens, and an aperture included in the output of the metering means. means for removing an error component based on the selected error data;
1. A wide open photometry error correction exposure control system in an interchangeable lens camera system, characterized in that the camera body is provided with means for controlling exposure based on the output from the removing means.