GB2227850A

GB2227850A - Automatic exposure camera

Info

Publication number: GB2227850A
Application number: GB9002150A
Authority: GB
Inventors: Akihiro Arai
Original assignee: Asahi Kogaku Kogyo Co Ltd
Current assignee: Pentax Corp
Priority date: 1989-02-03
Filing date: 1990-01-31
Publication date: 1990-08-08
Anticipated expiration: 2010-01-31
Also published as: JPH02102529U; FR2642860A1; GB2227850B; GB9002150D0; DE4003391A1

Description

a t AUTOMATIC EXPOS6RE CAME1k

Background of the Invention

1. Field of the Invention

The present invention relates to an automatic exposure (AE) camera, and more precisely, it relates to a camera having a programmed automatic exposure function in which a photographic purpose (composition etc.) of a photographer has a priority.

2. Description of Related Art

A camera having a programmed automatic exposure (which is often called program AE) function in which a combination of a shutter speed and a diaphragm value is automatically selected to obtain an optimum exposure in accordance with luminance (brightness) of an object to be taken has been commonly used, since by such a camera anyone can easily take a desired is picture.

There are several types of program AE functions; (I) a depth priority typein which a picture is taken at a practically possible largest F number which can be selected from among practical combinations of a diaphragm value and a shutter speed, (2) a shutter speed priority type in which a picture is 2.taken at a practically possible highest shutter speed which can be selected from among practical combinations of a diaphragm value and a shutter speed, and (3 a standard type in which a combination of a diaphragm value and a shutter speed lean neither to depth of field nor to shutter speed.

An AE camera having all the program AE functions mentioned above is 25also known.

However, in a known camera, during a program AE photographing at an optimum exposure, there is a case where a photographer's intention can not be fully reflected in a picture. Namely, for example, even if a picture of an object which moves at a relatively high speed is taken at the shutter speed 3.priority type of program AE, it is not guaranteed that no blur occurs at a shutter speed selected in accordance with the program, so that a desired clear picture can be taken only at a higher shutter speed. Similarly, even if a picture of an object is taken at the depth priority type of program AE, it is not guaranteed that the object is within a desired depth of field

5at a diaphragm value which is selected in accordance with the program, so that a desired picture can be taken only at a larger F number. These phenomena tend to occur particularly when an object to be taken is dark.

The primary object of the present invention is to provide an automatic exposure camera which includes adjusting means for automatically locorrecting an exposure condition which is automatically determined in accordance with the programed automatic exposure to an appropriate exposure condition which meets a photographer's intention or photographic purpose provided that a desired quality of picture can be ensured when a photographer prefers taking a picture in accordance with his or her photographic intention 1.rather than the automatically determined exposure condition.

Summary of the Invention

To achieve the object of the invention mentioned above, the inventors of the present invention have studied and focused on the realization of an 20exposurecondition adjusting means, based on a new philosophy which is completely different from the conventional idea of automatic exposure and in which latitude information is used to control the exposure in a different way from the prior art.

Namely, in the prior art, the automatic exposure control is effected

2StO obtain an optimum exposure, and latitude information is used only to eliminate a possible precision error of a photometer etc. Conversely, in the present invention, the optimum exposure is adjusted within a latitude of a film. Namely, the present invention is featured by an automatic exposure control in which even if the exposure is slightly deviated from an optimum 30exposure within a latitude, at least one of the shutter speed and the i diaphragm value is adjusted to meet a desired photographic intention. An extremely high precision of photometer etc. in a recent camera makes it possible to use latitude information in a way as in the present invention.

According to the present invention. there is provided an automatic exposure camera having an automatic exposure mode, comprising film information reading means for inputting at least sensitivity information and latitude of a film, a photometering means for detecting a luminance of an object to be taken, an arithmetic operating means for obtaining an optimum exposure based on the object luminance thus detected and the film sensitivity to determine a shutter speed and a diaphragm value in accordance with the automatic exposure mode, and adjusting means for shifting at least one of the shutter speed and the diaphragm value thus obtained by a predetermined variation within the latitude.

With this arrangement, when the adjusting means operates, one of or both of the shutter speed and the diaphragm value is or are adjusted (shifted) by a predetermined variation within the latitude of the film, in accordance with the photographic intention. In this state, the exposure is automatically deviated from an optimum exposure. However, the deviation is within the latitude of the used film, a desired film quality can be ensured.

Brief Description of the Drawings

The invention will be described below in detail with reference to the accompanying drawings, in which:

Figure 1 is a block diagram of main components of an automatic exposure camera according to an embodiment of the present invention; Fig. 2 is a more detailed schematic block diagram of an automatic exposure camera according to an embodiri-ient of the present invention, shown in Fig. 1; Fig. 3 is a perspective view of a film showing a CAS code provided thereon; 1 Fig. 4A, 4B 4C are a consecutive flow chart of operations of an automatic exposure camera shown in Fig. 1; and, _.

Figs. 5, 6A, 6B, 7, 8A and 8B are program diagrams showing differences of exposure conditions depending on photographing modes.

Description of Preferred Embodiment

The illustrated embodiment of the present invention is applied to an automatic exposure camera. Note that components of the invention are schematically drawn in the drawings, and accordingly, the shapes and dimensions thereof are inaccurate. It should be understood that the invention is not limited to the illustrated embodiment.

Fig. 2 shows a block diagram of an automatic exposure single lens reflex camera according to an embodiment of the present invention. In Fig. 2, numerals 100 and 200 designate a camera body 100 and a photographing lens, 15 respectively. Furthermore, numerals 11, 13 and 15 connote a photometering means for detecting luminance of an object to be taken, a film information reading means for reading at least sensitivity and latitude of a film, and a selecting means for selecting photographing modes, respectively. A CPU (central processing unit) 31 continuously controls the various operations of the automatic exposure camera. For instance, the CPU 31 controls exposure modes of a depth priority type program AE, a standard type of program AE, a speed priority type of program AE, a diaphragm priority type of program AE, a shutter speed priority type of program AE, a manual exposure and a bulb exposure. The selection of the exposure modes is effected by the photographing mode selecting means 15 which is manually actuated by a photographer to command the CPU 31.

An arithmetic operating means 17 which is composed of the CPU 31 operates to obtain an optimum exposure, based on the luminance of the object detected by the photometering means (photometer) 11 and the film sensitivity detected by 30 the film information reading means 13, so that shutter speed and diaphragm W value can be determined to correspond to the AE mode selected by the photographing mode selecting means 15. Numerals 19 and 21 designate a shutter control circuit which controls the opening and closing operation of the shutter 33 in accordance with the shutter speed determined by the arithmetic operating means 17, and a diaphragm control circuit which controls the opening and closing operation of a diaphragm 35 in accordance with the diaphragm value determined by the arithmetic operating means 17, respectively.

When a photographer wants to take a picture at a photographic intention priority mode, he or she actuates a photographer's intention priority mode selection switch 23. When the photographer's intention priority mode selection switch 23 is actuated, an adjusting means 25 operates to shift at least one of the shutter speed and the diaphragm value determined by the arithmetic operating means 17 by a predetermined variation within a latitude which is detected by the film information reading means 13. The adjusting means 25 is also composed of the CPU 31.

In Fig. 2, numeral 37 designates a main mirror, 39 a pentagonal prism, 41a main mirror drive circuit, 43 a power switch which makes the power source of the camera ON and OFF, 45 a shutter button, 47 a ROM which stores programs for determining shutter speed data and diaphragm value data corresponding to optimum exposures at the respective program modes, 49 a RAM which stores the film information etc. fetched into the CPU 31, and 51 a film loaded in the camera body 100. The patrone of the film 51 has a DX code printed on the surface thereof.

The constructions of the main components of the apparatus of the present invention will be explained in detail below.

The photometer 11 which is of a TTL type perse known has a light receiverlla, an arithmetic amplifier llb and a logarithmic compression diode llc. The photometer 11 sends the luminance signal of the object which is converted to an APEX value Bv to the arithmetic operating means 17 which is composed of the CPU 31.

f k.

The film information reading means 13 reads the CAS (Camera Auto Sensing)code of the DX code applied to the patrone of the film 51. The CAS code is constituted by 12 batches, one of which is grounded. The film information reading means 13 has contacts 13a which come into contact with the corresponding 11 batches other than the grounded batch, resistances 13b which are connected to the contacts 13a and the power source V, and buffer circuits 13c which are provided between the connections of the contacts 13a and the resistances 13b and predetermined ports (P1 - P11) of the CPU 31.

The CAS code applied to the patrone of the film is made of 12 10 batches a -1, as mentioned above and as shown in Fig. 3. Among those batches, the batches b-f represent a sensitivity (ISO sensitivity) of the film, the batches h -j represent the number of frames of the film, and the batches k and 1 represent a latitude of the film. The batches a and g have a common electrode and are grounded. Some of the remaining batches other than the batches a and g are conductive batches and the other batches are insulative batches, depending on a predetermined code representing properties of a film to be used. In the illustrated embodiment, the insulative batches c, j and e are hatched (Fig. 3). The conductive batches are electrically connected to the earth. Accordingly, the potential of the electrical contacts 13a (Fig. 2) which are in contact with the conductive batches is, for example, 0 volt, and the potential of the electrical contacts 13a (Fig. 2) which are in contact with the insulative batches is, for example, +V volt. Consequently, the voltages of +V volt (High) and 0 volt (Low) are supplied to the ports pl -pll of the CPU 31, corresponding to the codes representing the ISO sensitivity, the number of frames of the film, and the latitude of the film, respectively.

The photographing mode selecting means 15 is for example in the form of a switch means connected to a port Pm of the CPU 31. Whenever a switch (not shown) of the photographing mode selecting means (switch means) 15 is pushed down by a photographer, the programs of the various photographing modes (including the AE modes) which are prestored in the CPU 31 in a predetermined order are successively selected. When the switch is stopped, the camera can operate at a selected photographing mode.

The shutter control circuit 19 and the diaphragm control circuit 21 are made of circuits perse known. In the illustrated embodiment, the shutter controlcircuit 19 has a preceding curtain control portion 19a which is composed of a transistor and an electromagnet and a trailing curtain control portion 19b which is composed of a transistor and an electromagnet. The diaphragm control circuit 21 in the illustrated embodiment is composed of a transistor and an electromagnet which drives a diaphragm engaging member 21a.

In the illustrated embodiment, the photographer's intention priority modeselection switch 23 selects a mode (which will be referred to as a fail-safe mode hereinafter) which is selected to minimize an occurrence of the blur or a failure, such as photographing of a picture out of the depth of field, a mode (which will be referred to as a technique mode hereinafter) which is selected to take a portrait or effect a panning, and a mode in which the photographer's intention priority mode selection switch 23 is made OFF. When a photographer selects the fail-safe mode or the technique mode, the voltage of a port Pw or Px of the CPU 31 is changed from the "High" level to the "Low' level.

A shutter button 45 is a so-called two-step switch, so that when it is pushed down by a half step, a first switch 45a thereof is made ON, and when it is fully pushed down, a second switch 45b is made ON. The first switch 45a serves as a photometer starting switch and the second switch 45b serves as a release switch.

The following discussion will be directed to the operation of the automatic exposure camera according to the present invention shown in Fig. 2, particularly with reference to Figs. 2 and 4 to understand the arithmetic operating means 17 and the adjusting means 25 in more detail.

Fig. 4 NA -0 is a flow chart of the operations of the automatic exposure camera. The operations are performed by the CPU 31 in accordance with the control program which is memorized in the CPU 31.

! 'I ,Shen the power switch 43 is made ON, the CPU 31 starts operating (step 301).

When the film 51 is charged in the camera body 100 (step 303), the CPU 31 reads film information including the film sensitivity, the film latitude, and the number of film frames through the ports Pl-Pll (step 305). The these data read by the CPU 31 are stored in the RAM 49 at a predetermined address thereof (step 307).

Thereafter, the CPU 31 cheeks whether or not the photometer switch 45a -ismade ON through the change in voltage of the port Pz of the CPU 31 (step 309). If the photometer switch 45a is made ON, the luminance of the object is detectedby the photometering means 11 at step 311, so that the CPU 31 fetches the luminance data at step 313.

The arithmetic operating means 17 which is constituted by the CPU 31 determines an optimum exposure Ev, based on the film sensitivity stored in the RAM 49 and the object luminance detected by the photometering means 11 (step 315). The optimum exposure Ev can be obtained by the following equation:

Ev = Sv + Bv = Tv + Av wherein Sv is the film sensitivity and Bv is the object luminance.

The CPU 31 cheeks whether the mode selected by the photographer through the photographing mode selecting means 15 is the shutter speed priority manual exposure mode (steps 317 and 319), the diaphragm priority 2-5 manual exposure mode (steps 317, 321 and 331), a normal manual exposure mode (steps 317, 321, 331 and 341), the speed priority type of program AE mode (steps 317 and 351), the depth priority type of program AE mode (steps 317, 351 and 361), or the standard type of program AE mode (steps 317, 351, 361 and 371). Thereafter, the CPU 31 performs the following operations.

(a)If the shutter speed priority manual exposure mode is selected, k the shutter speed data Tv set by the photographer is fetched at step 323, so that anoptimum diaphragm value Av can be obtained from the following equation (step 325):

Av = Ev-Tv (b) If the diaphragm priority manual exposure mode is selected, the diaphragm value Av set by the photographer is fetched in the CPU 31 at step 333, so that an optimum shutter speed Tv can be obtained from the following equation (step 335):

Tv = Ev - Av (c) If the normal manual exposure mode is selected, the diaphragm value Av and the shutter speed Tv set by the photographer are fetched in the CPU 31 atstep 341.

(d) If the standard type of program AE mode is selected, the CPU 31 determines an optimum diaphragm value Av and an optimum shutter speed Tv to give an optimum exposure Ev in accordance with the program stored in the ROM 47.

(e) If the speed priority type of program AE mode is selected, the CPU 31 operates as follows.

Fig. 5 shows an example of a program diagram when the speed priority typeof program AE mode is selected. When the photographer's intention priority mode selection switch 23 is made OFF (shown at 23b in Fig. 2), the CPU 31 determines a shutter speed and a diaphragm value to give an optimum exposure Ev in accordance with the program diagram (steps 351, 353 and 357). Consequently, supposing that the optimum exposure Ev is for example, 11, the shutter speed is 1/250 second (Tv=8), and the diaphragm value is F2.8 (Av=3), as shown at point A in Fig. 5. On the other hand, if the photographer's intention priority mode selection switch 23 is made ON, according to the present invention, one or both of the shutter speed and the diaphragm value is adjusted to meet the photographic intention. The adjustment can be effected as follows.

If Supposing that the latitude of the film 51 which is charged in the camerabody 100 is 1 EV, if the photographer actuates the photographer's intention priority mode selection switch 23 to select the fail-safe mode (shown at 23c in Fig. 2), the CPU 31 shifts the program diagram shown in Fig.

s 5 to a program diagram (Fig. 6A) in which the shutter speed is made higher by one step corresponding to 1EV than that of Fig. 5, in accordance with the change in voltage of the port Pw of the CPU 31. In Fig. 6A, the program diagrams before and after shift are shown at imaginary line and sold line, respectively. Consequently, the optimum exposure Ev which was 11 is deemed to be 12, and accordingly, the diaphragm value is maintained at F2.8 (Av=3) but the shutter speed becomes 1/500 second (Tv=g), as shown at a point B in Fig. 6A.

As can be seen from the foregoing, when the speed priority type of program AE mode is selected, if the photographer's intention priority mode selection switch 23 is switched to the fail-safe mode, the exposure becomes an under-exposure within the latitude, whereas the shutter speed is automatically shifted toward a higher speed side (steps 351, 353, 354, 355 and 357). Conversely, when the photographer's intention priority mode selection switch 23 is switched to the technique mode (shown at 23a in Fig.2), the CPU 31 shifts the program diagram shown in Fig. 5 to a program diagram shown in Fig. 6B in which the shutter speed is made lower by one step corresponding to 1 EV, in accordance with a change in voltage of the port Px of the CPU 31. In Fig. 6B, the program diagrams before and after shift are shown at imaginary line and sold line, respectively. Consequently, the optimum exposure Ev which was 11 is deemed to be 10, and accordingly, the diaphragm value is maintained at F2.8 (Av=3), but the shutter speed becomes 1/125 second (Tv=7), as shown at a point C in Fig. 6B. Thus, when the speed priority type of program AE mode is selected, if the photographer's intention priority mode selection switch 23 is switched to the technique mode, the exposure becomes an over-exposure within the latitude, whereas the shutter 1 1 -11speed is automatically shifted toward a lower speed side (steps 351, 353, 354, 356 and 357), accordingly.

The above description has been directed to the operations of the automatic exposure camera when the speed priority type of program AE mode is 5 selected.

(f) If the depth priority type of program AE mode is selected, the CPU 31 operates as follows.

Fig. 7 shows an example of a program diagram when the depth priority type of program AE mode is selected. When the photographer's intention priority mode selection switch 23 is made OFF, the CPU 31 determines a shutter speed and a diaphragm value to give an optimum exposure Ev in accordance with the program diagram shown in Fig. 7 (steps 361, 363 and 367). Consequently, supposing that the optimum exposure Ev is, for example 10, the shutter speed is 1/60 second (Tv=6), and the diaphragm value is F4 (Av=4), as shown at point D in Fig. 7. On the other hand, if the photographer's intention priority mode selection switch 23 is made ON, according to the present invention, one or both of the shutter speed and the diaphragm value is adjusted to meet the photographic intention. The adjustment can be effected as follows.

Supposing that the latitude of the film 51 which is charged in the camerabody 100 is 1 EV, if the photographer actuates the photographer's intention priority mode selection switch 23 to select the fail-safe mode, the CPU 31 shifts the program diagram shown in Fig. 7 to a program diagram shown in Fig. 8A in which the diaphragm value is diaphragmed by one step corresponding to 1EV than that of Fig. 7. In Fig. 8A, the program diagrams before and after shift are shown at imaginary line and sold line. respectively. Consequently, the optimum exposure Ev which was 10 is deemed to be 11, and accordingly, although the shutter speed is maintained at 1/60 second, the diaphragm value becomes F5.6 (Av=5), as shown at a point E in 3 o Fig. 8A.

As can be seen from the foregoing, when the depth priority type of program AE mode is selected, if the photographer's intention priority mode selection switch 23 is switched to the fail-safe mode, the exposure becomes an under-exposure within the latitude, whereas the diaphragm value is _5automatically shifted toward a smaller diaphragm" value, i.e. a further diaphragmed value (steps 361, 363, 364, 365 and 367). Conversely, when the photographer's intention priority mode selection switch 23 is switched to the technique mode, the CPU 31 shifts the program diagram shown in Fig. 7 to a program diagram shown in Fig. 8B in which the diaphragm value is made larger by one step corresponding to 1 EV. In Fig. 8B, the program diagrams before and after shift are shown at imaginary line and sold line, respectively. Consequently, the optimum exposure Ev which was 10 is deemed to be 9, and accordingly, although the shutter speed is maintained at 1/60 second (Tv=6), the diaphragm value becomes F 2.8 (Av=3), as shown at a point F in Fig. 8B.

is Thus, when the depth priority type of program AE mode is selected, if the photographer's intention priority mode selection switch 23 is switched to the technique mode, the exposure becomes an over-exposure within the latitude, whereas the diaphragm value is shifted toward a larger diaphragm value (steps 361, 363, 364, 366 and 367), accordingly.

In the operations (a)-(f) mentioned above, after the diaphragm value Av and the shutter speed Tv are determined, the CPU 31 checks whether the release switch 45b is made ON, in accordance with a change in voltage of the port Pr of the CPU 31. If the release switch 45b is made ON, the diaphragm is driven by a spring (not shown) or the like. The displacement of the diaphragm is detected by an encoder (not shown) to become a predetermined value. In the illustrated embodiment, the CPU 31 sends a control signal to the diaphragm control circuit 21 to drive the electromagnet thereof in order to actuate the diaphragm engaging member 21a, so that the diaphragm 35 can be fixed at a predetermined diaphragm value. Thereafter, the CPU 31 drives the preceding curtain control portion lga to move the preceding curtain and then the trailing curtain control portion 19b in a predetermined time thereafter to move the trailing curtain (step 383).

The film 51 is advanced by one frame by a film winding mechanism (not shown) at step 385. Thereafter, the control proceeds to step 309 to check 5 whether the photometer switch 45a is made ON again.

If no release switch 45b is made ON at step 381, the whether or not the photometer switch 45a is released (i. e. is made OFF) is checked. If the photometer switch 45a is maintained ON, whether or not the release switch 45b is made ON (steps 387 and 381). If the photometer switch 45a has been already released, the control is returned to step 309 to check whether the photometer switch 45a is made ON again.

According to the illustrated embodiment mentioned above, a possibility offailure of photographing, such as an occurrence of blur or a picture being takenout of a depth of field can be largely decreased, while keeping the

1. quality of a picture within an allowable limit. Furthermore, not only a picture of a portrait can be simply taken, but also a panning can be easily effected.

Although the above-mentioned embodiment is directed to a single lens reflex camera, the present invention is not limited thereto. Namely, the present invention can be applied to other camera, such as a lens shutter camera.

Furthermore, the photometering means, the film information reading means and the photographing mode selecting means etc. are not limited to those mentioned above and can be replaced with equivalents.

As can be understood from the above discussion, in an automatic exposure camera according to the present invention, when the photographic intention priority mode is selected, at least one of the shutter speed and the diaphragm value which are determined in accordance with the stored program is automatically shifted to meet the photographer's intention within a latitude of the film. Although the exposure deterri-lned in accordance with the shifted exposure condition is deviated from a theoretical optimum value, the exposure is maintained within the latitude.of the film, and accordingly, the photographing at a photographer's intention priority mode can be effected without decreasing a quality of a picture.

1.0 is h 1 h k -is-

Claims

CLAIMS:

1. An automatic exposure camera having an automatic exposure mode, comprising:

a film information reading means for inputting at least sensitivity information and latitude information, of a film; a photometering means for detecting a luminance of an object to be taken; an arithmetic operating means for obtaining an optimum exposure based on the object luminance thus detected and the film sensitivity to determine a shutter speed and a diaphragm value in accordance with the automatic exposure mode; and, an adjusting means for shifting at least one of the shutter speed and thediaphragm value thus obtained by a predetermined variation within the latitude.

2. An automatic exposure camera according to claim 1, wherein said film information reading means comprises means for reading a DX code formed on a patrone surface of a film, so that the film sensitivity information and the film latitude information are inputted through the DX code reading means.

3. An automatic exposure camera according to claim 1, further comprising a switch means for controlling the operation of the adjusting means.

4. An automatic exposure casilera according to claim 1, further comprisinga plurality of exposure modes, and an exposure mode selecting means for selecting one of the exposure modes.

5. An automatic exposure camera according to claim 1, wherein said v k automatic exposure mode includes a programmed automatic exposure mode in which the shutter speed and the diaphragm value are varied along a predetermined program diagram.

6. An automatic exposure camera according to claim 5, wherein said adjusting means shifts the program diagram within the latitude.

7. An automatic exposure camera according to claim 1, wherein said automatic exposure mode includes a depth priority type of program automatic exposure mode, so that when the selected automatic exposure mode is the depth priority type of program automatic exposure mode, the adjusting means shifts the determined diaphragm value to a maximum value within the latitude.

8. An automatic exposure camera according to claim 7, wherein said adjusting means comprises a switch means which is made ON and OFF by an external operation, and wherein when said depth priority type of program automatic exposure mode is selected and when said switch means is made ON or OFF, said adjusting means shifts the determined diaphragm value to a maximum value within the latitude.

9. An automatic exposure camera according to claim 1, wherein said automatic exposure mode includes a high speed shutter priority type of program automatic exposure mode, and wherein said adjusting means comprises a shifting means for shifting the determined shutter speed to a maximum value within the latitude when the selected automatic exposure mode is the high speed shutter priority type of program automatic exposure mode.

10. An automatic exposure camera according to claim 9, wherein said adjusting means comprises a switch means which 5s made ON and OFF by an external operation, and wherein when said high speed shutter priority type of k 17program automatic exposure mode is selected and when said switch means is made ON or OFF, said adjusting means shifts the determined shutter speed to a maximum value within the latitude.

11. An automatic exposure camera having a plurality of automatic exposure modes, comprising: a photometering means for detecting a luminance of an object to be taken; a film information reading means for inputting at least sensitivity information and latitude information, of a film; an exposure mode selecting means for selecting the automatic exposure modes; an arithmetic operating means for obtaining an optimum exposure based on the object luminance and the film sensitivity to determine a shutter speed and a diaphragm value in accordance with the automatic exposure mode selected by the exposure mode selecting means; and, a control means for driving and controlling the shutter and the diaphragm, based on the shutter speed and the diaphragm value determined by the arithmetic operating means; wherein the improvement comprises a photographer's intention priority mode selection switch; and, an adjusting means which operates when the photographer's intention priority mode selection switch is made ON to shift at least one of the determined shutter speed and the determined diaphragm value by a predetermined variation within the latitude.

12. An automatic exposure camera according to claim 11, wherein said automatic exposure modes include a depth priority type of program automatic exposure mode, and wherein said adjusting means comprises a shifting means for shifting the determined diaphragm value to a maximum value within the -18latitude when the selected automatic exposure mode is the depth priority type of program automatic exposure mode.

13. An automatic exposure camera according to claim 11, wherein said automatic exposure modes include a high speed shutter priority type of program automatic exposure mode, and wherein said adjusting means comprises a shifting means for shifting the determined shutter speed to a maximum value within the latitude when the selected automatic exposure mode is the high speed shutter priority 10 type of program automatic exposure mode.

is - 25 Published. 1990 a-, ',Fate S:.tLHzjcc,66 72 4TP 'l'jthc7 cop!, be Office.

Sales B-. -eh, St C. aj. KentEM. 3RD- Pi,rtc-J',-, II.ItIplex,-,hr,qies ltd, StMary C: Yt;-.t, C-n 1;87-