JP2002118777A - Camera system, camera and lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera system where the optical performance of a lens is enhanced, without giving restrictions on the required degrees or over to assurance of a back focus in the lens design stage and the occurrence of the interference between the lens and an elevating/lowering mirror taking place resulting in giving damages to them is prevented. SOLUTION: In the camera system, consisting of a combination of a camera body having the elevating/lowering mirror, that is normally placed at a retracting position at the outside of a photographing optical path and advancing in the photographing optical path to lead a photographing optical flux to an optical finder and of a lens attachable to/detachable from the camera body, the lens has an information transmission means that transmits specific information of the lens, and the camera body has a discrimination means that discriminates the lens specific information from the information transmission means and an elevating/lowering mirror position control means (S12 to S13, or S12 to S15) that controls the position of the elevating/lowering mirror, depending on the result of discrimination by the discrimination means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera system and camera comprising a combination of a camera body having a lifting mirror and a lens detachable from the camera body, and to an improvement of the lens.

[0002]

2. Description of the Related Art Conventionally, in an interchangeable lens camera system provided with an optical viewfinder having a lift mirror, the interchangeable lens does not interfere with the operation of the lift mirror of the camera at the stage of designing the interchangeable lens. Was designed to ensure the back focus of the lens. Alternatively, if the camera has a mirror-up mechanism, when using an interchangeable lens that has a short back focus on the lens and interferes with the elevation mirror when attached to the camera as it is, The mirror was raised by operation to prevent interference.

[0003]

However, if an attempt is made to design a lens with a sufficient back focus so as not to interfere with the elevating mirror, a lens with a short focal length imposes restrictions on the optical type, and the optical type is limited. Designing to meet performance has been a difficult task. Alternatively, it was necessary to sacrifice some optical performance in order to secure the back focus.

Further, in a method in which a photographer operates a mirror-up device to raise a mirror, an attempt is made to attach a lens while forgetting to raise the mirror, and a vertical mirror of a camera or a rear end of an interchangeable lens is damaged. There was a thing. Also, when the mirror is raised, the built-in optical viewfinder of the camera cannot be used as a matter of course.
Alternatively, the composition had to be determined by eye measurement.

(Object of the Invention) A first object of the present invention is to improve the optical performance of a lens or to raise and lower the lens without restricting the back focus at the stage of designing the lens more than necessary. An object of the present invention is to provide a camera system, a camera, and a lens that can prevent the mirrors from being damaged due to interference with a mirror.

A second object of the present invention is to provide a camera system and a camera capable of not only confirming an image with an optical finder but also confirming an image using the output of a photoelectric conversion element. .

A third object of the present invention is to provide a camera system and a camera capable of confirming an image with image display means even if the image cannot be confirmed with an optical finder. It is.

[0008]

In order to achieve the first object, the invention according to claim 1 is usually at a retreat position outside a photographing optical path, and enters the photographing optical path from the retreat position. The lens system transmits unique information of the lens in a camera system comprising a combination of a camera body having a lifting mirror for guiding a photographing light beam to an optical finder and a lens detachable from the camera body. The camera main body includes a discriminating unit that discriminates the lens-specific information from the information transmitting unit, and a lift mirror position control that controls a position of the lift mirror based on a result of the discrimination by the discriminating unit. And a camera system.

[0009] Similarly, in order to achieve the first object,
According to a second aspect of the present invention, there is provided a camera body having an elevating mirror for guiding a photographing light beam to an optical finder by being normally located at a retracted position outside a photographing optical path and being made to enter the photographing optical path from the retracted position. In a camera system comprising a combination with a lens detachable from the camera body, the lens may have a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. Information transmitting means for transmitting information indicating whether or not the camera body has a discriminating means for discriminating the information from the information transmitting means; If it is determined that the lifting mirror has a structure that interferes with the movement of the lifting mirror, the lifting mirror is held at the retracted position. It is an camera system and a control unit.

[0010] Similarly, in order to achieve the first object,
The invention according to claim 3 is a camera body having an elevating mirror for guiding a photographing light beam to an optical finder by being normally located at a retracted position outside a photographing optical path and being caused to enter the photographing optical path from the retracted position. In a camera system comprising a combination with a lens detachable from the camera body, the lens may have a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. Information transmitting means for transmitting information indicating whether or not the camera body has a discriminating means for discriminating the information from the information transmitting means; If it is determined that the mirror has a structure that does not affect the interference with the lifting mirror, the lifting mirror moves the lifting mirror to the approach position. It is an camera system including a chromatography position control means.

[0011] Similarly, in order to achieve the first object,
The invention according to claim 4 is a camera body having an elevating mirror for guiding a photographing light beam to an optical finder by being normally located at a retracted position outside a photographing optical path and being made to enter the photographing optical path from the retracted position. In a camera system comprising a combination with a lens detachable from the camera body, the lens may have a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. Information transmitting means for transmitting information indicating whether or not the camera body has a discriminating means for discriminating the information from the information transmitting means; If the lens is determined to have a structure that interferes with the movement of the lens, the lifting mirror is held at the retracted position, and the lens is A camera having a lifting / lowering mirror position control means for moving the lifting / lowering mirror to the entrance position when it is determined that the lifting / lowering mirror has a structure that does not affect the interference with the entrance position. System.

In order to achieve the second object,
According to a fifth aspect of the present invention, there is provided the camera system according to any one of the second to fourth aspects, further including a photoelectric conversion element that receives a photographing light beam and outputs an image signal.

[0013] Similarly, to achieve the second object,
The invention according to claim 6 has a photoelectric conversion element that receives a photographing light beam and outputs an image signal, and image display means that displays an image based on a signal from the photoelectric conversion element. The camera system according to any one of the above.

Further, in order to achieve the third object,
The invention according to claim 7, further comprising: a photoelectric conversion element that receives a photographing light beam and outputs an image signal; and an image display unit that displays an image based on a signal from the photoelectric conversion element, wherein the determination unit includes: If it is determined by the above that the lens has a structure that interferes with the movement of the lifting mirror to the entry position, the image display means is driven to allow the photographer to observe the image A camera system according to any one of claims 2 to 4, further comprising an image control unit.

Further, in order to achieve the first object,
The invention according to claim 8 is characterized in that the lifting mirror position control means moves the lifting mirror to the retracted position by removing the lens from the camera body and holds the same at that position. A camera system according to 3 or 4.

Similarly, in order to achieve the first object,
According to a ninth aspect of the present invention, there is provided a camera having an elevating mirror for guiding a luminous flux to an optical finder by being normally located at a retracted position outside a photographic optical path and being caused to enter the photographic optical path from the retracted position. Capture the unique information of the lens from the lens attached to the camera, from the unique information, when the lens is attached to the camera body,
Discriminating means for discriminating whether or not the lens has a structure that interferes with the movement of the lifting mirror to the entry position; and the discrimination means causes the lens to move to the entry position of the lifting mirror. If it is determined that there is interference, the camera is provided with a lift mirror position control means for holding the lift mirror at the retracted position.

Similarly, in order to achieve the first object,
The invention according to claim 10 is a camera having an elevating mirror for guiding a luminous flux to an optical finder by being normally located at a retreat position outside a photographic optical path and being caused to enter the photographic optical path from the retreat position, The unique information of the lens is taken in from the lens attached to the camera, and based on the unique information, when the lens is attached to the camera body, the lens interferes with the movement of the lifting mirror to the entrance position. Discriminating means for discriminating whether or not the moving mirror has a structure that does not affect the interference of the lifting mirror with the entry position. The camera has a lifting mirror position control means for moving the mirror to a position.

Similarly, in order to achieve the first object,
The invention according to claim 11 is a camera having an elevating mirror for guiding a photographing light beam to an optical finder by being normally located at a retracted position outside a photographing optical path and being made to enter the photographing optical path from the retracted position, The unique information of the lens is taken in from the lens attached to the camera, and based on the unique information, when the lens is attached to the camera body, the lens interferes with the movement of the lifting mirror to the entrance position. Discriminating means for discriminating whether or not the lens has been moved up and down if the discriminating means determines that the lens has a structure that interferes with the movement of the lifting mirror to the entrance position. It is determined that the mirror is held at the retracted position and the lens has a structure that does not affect the interference of the lifting mirror with the entrance position. If it is, it is an camera having an elevation mirror position control means for moving said elevating mirror to the entry position.

In order to achieve the second object,
According to a twelfth aspect of the present invention, there is provided the camera according to any one of the ninth to eleventh aspects, further including a photoelectric conversion element that receives a photographic light beam and outputs an image signal.

Similarly, in order to achieve the second object,
A thirteenth aspect of the present invention has a photoelectric conversion element that receives a photographing light beam and outputs an image signal, and image display means that displays an image based on a signal from the photoelectric conversion element. According to any one of the above.

In order to achieve the third object,
The invention according to claim 14, wherein a photoelectric conversion element that receives a photographing light beam and outputs an image signal, image display means for displaying an image based on a signal from the photoelectric conversion element, and the lens by the determination means Is determined to have a structure that interferes with the movement of the elevating mirror to the entrance position, the image control means for driving the image display means to allow a photographer to observe an image A camera according to any one of claims 9 to 11, comprising:

In order to achieve the first object,
The invention according to claim 15 is characterized in that the lift mirror position control means moves the lift mirror to the retracted position by holding the lens and removes the lens, and holds the lift mirror at that position. The camera described in the description.

Similarly, in order to achieve the first object,
According to a sixteenth aspect of the present invention, when attached to the camera according to any one of the ninth to eleventh aspects, it is determined whether or not the camera has a structure that interferes with a moving area of a lifting mirror provided in the camera. The lens has information transmitting means for transmitting the indicated information.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments. FIG. 1 is a configuration diagram of a camera system according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a camera body, and 2 denotes an interchangeable lens (barrel).

The interchangeable lens 2 includes a lens mount 2
01, a glass lens 202 is provided. further,
A lens microcomputer 203 in which initial data unique to each lens is recorded is mounted. When the interchangeable lens 2 is attached to the camera body 1, the camera body 1 is replaced by connecting the respective communication contact units 204 and 104. The lens 2 can be determined. The interchangeable lens 2 controls the aperture drive motor 205 and the lens drive motor 206 by a control signal and power supply from the camera body 1.

On the other hand, a camera microcomputer 102 is mounted on the camera body 1, and a release switch (SW)
114, power supply unit 115, CCD as photoelectric conversion image sensor
101, an image signal processing circuit 103, a liquid crystal monitor 105 as a display device, and a mirror operation drive circuit 107. Furthermore, a lifting mirror 108 driven by a motor by a mirror operation driving circuit 107, a prism section 109 as an optical finder section, a focusing screen 110, and an eyepiece 111 are provided. Reference numeral 112 denotes a camera mount on which the interchangeable lens 1 is mounted, and reference numeral 113 denotes a mirror box that is a space for operating the lifting mirror 108.

Next, the operation will be described.

When the interchangeable lens 2 is not attached to the camera body 1, the lifting mirror 108 is at the retracted position. In this state, when the interchangeable lens 2 is attached to the camera mount 112 and the communication contact unit 104 and the communication contact unit 204 are connected, the camera microcomputer 12
0 reads the initial data of the attached interchangeable lens 2 via the lens discriminating circuit 106, and the interchangeable lens is a glass lens 202 rather than a lens mount 201.
Is largely projected and enters the operation (movement) area of the elevation mirror 108 of the camera body 1. That is, when the elevating mirror 108 enters the optical path, the interchangeable lens 2 cannot be attached (since it interferes with the elevating mirror 108). This is an interchangeable lens that may damage the mirror 108.

Therefore, in this case, the camera microcomputer 102 does not operate the elevating mirror 108, and outputs the signal of the CCD 101, which is a photoelectric conversion image sensor, to the image signal processing circuit 10.
3 to output an image signal to a liquid crystal monitor 105 as a display device.

Therefore, the photographer can use the optical finder 10
Although the photographed image cannot be confirmed through the display 9, the image is displayed on the liquid crystal monitor 105, so that photographing can be performed by confirming the image. That is, an image signal for observing an image and an image signal for actual photographing are both obtained from the CCD 101.

FIG. 2 shows the camera body 1 shown in FIG.
FIG. 7 is a configuration diagram showing a state where an interchangeable lens 3 having a structure different from that of the interchangeable lens (a structure in which a glass lens does not protrude from a lens mount) is attached.

The interchangeable lens 3 includes the interchangeable lens 2
Components having the same functions as those of the lens mount 301, the glass lens 302, and the lens microcomputer 30
3, communication contact unit 304, aperture drive motor 305,
A lens drive motor 306 is provided.

In the state where the interchangeable lens 3 having the structure shown in FIG.
Reference numeral 8 denotes a retreat position. In this state, when the interchangeable lens 3 is attached to the camera mount 112 and the communication contact unit 304 and the communication contact unit 104 are connected, the camera microcomputer 102 reads initial data of the attached interchangeable lens via the lens determination circuit 106. It is determined that the interchangeable lens has a structure in which the glass lens 302 does not protrude from the lens mount 301 and does not enter the operation area of the lifting mirror 108 of the camera body 1.

Therefore, in this case, the camera microcomputer 102
Is a lifting mirror 108 via a mirror operation driving circuit 107
Is moved to a usable position (the state shown in FIG. 2), and the optical viewfinder 109 is made usable.

Therefore, the photographer can use the optical viewfinder 10
When the release switch 114 is operated after confirming the image through the shutter 9, the lift mirror 108 performs a click return operation (the state shown in FIG. 1), and the CCD 101 receives the light beam from the subject. Then, shooting can be performed.

Next, the operation of the camera microcomputer 102 until the above-described interchangeable lens is attached and the camera waits for photographing will be described with reference to the flowchart of FIG.

The initial state is as described above.
Is held at the retracted position, and the interchangeable lens 3 is attached to the camera mount 112 in this state.

The camera microcomputer 102 first executes step S
At 10, it is determined whether or not the interchangeable lens 3 has been attached to the camera body 1. If not, the process stands by at this step. Then, the communication contact unit 104
When it is detected that the interchangeable lens is attached via the communication contact 104, the process proceeds to step S11, and the initial data of the attached interchangeable lens is received from the lens microcomputer 202 via the communication contact 104. It is determined via the lens determination circuit 106 whether the lens is a lens that can use the lifting mirror 108. As a result, when it is determined that the elevating mirror 108 is a usable interchangeable lens 3, the process proceeds to step S <b> 13, and when it is determined that the elevating mirror 108 is an unusable interchangeable lens 2, the process proceeds to step S <b> 15.

In step S12, the lifting mirror 108
Is determined to be a usable interchangeable lens 3 and step S
In step S13, the camera microcomputer 102 moves the elevation mirror 108 to the use position via the mirror drive circuit 107 as shown in FIG. 2, and prepares for a normal click return operation (normal operation) in the next step S14. (Meaning preparation for shooting operation). Then, the next step S1
In step 4, it is again determined whether or not the interchangeable lens is attached.
Proceeding to step 8, the operation waits for the operation of the release switch 114.

In step S17, if the interchangeable lens has been removed during the above-described operation, the process proceeds to step S9, in which the elevation mirror 108 is moved to the retracted position, and thereafter, the process returns to step S10. Wait until the interchangeable lens is attached again.

If it is determined in step S12 that the lifting mirror 108 is the unusable interchangeable lens 2 and the flow advances to step S15, the optical finder 10
9, the photographer can confirm the composition of the photographing. Therefore, the process proceeds to step S16 while the lifting mirror 108 is held at the retracted position, and the image signal is captured from the CCD 101 via the image signal processing circuit 103, and the liquid crystal monitor 1
At 05, an image is displayed and the photographer checks the composition.
Then, the process proceeds to the next step S17, and as described above, it is determined whether or not the interchangeable lens is attached. If it is detected that the interchangeable lens has been removed, the process proceeds to step S9.
If the interchangeable lens remains attached, the process proceeds to step S18.

Next, the operation of the camera microcomputer 102 after photographing when it is determined in step S12 that the interchangeable lens 3 can be used in step S12 will be described with reference to the flowchart of FIG.

After photographing, the camera microcomputer 102 first determines in step S21 whether or not the interchangeable lens 3 is still attached. If the interchangeable lens 3 is still attached, the process proceeds to step S22, where the mirror operation drive circuit 107 is activated. Move the lifting mirror 108 to a usable position through
In the next step S23, preparation for a click return operation is made. Then, in the next step S24, the attached state of the interchangeable lens 3 is checked, and if the attached lens is still attached, the process proceeds to step S25, and a shooting standby state is set.

If the interchangeable lens 3 has not been attached in step S21, or if it is determined in step S24 that the interchangeable lens 3 has been removed during the above operation, the process proceeds from step S26 to step S27. Proceed,
While the lifting mirror 108 is held at the retracted position, the operation standby state is set.

Next, the operation after photographing when the elevating mirror 108 is determined to be the unusable interchangeable lens 2 in step S12 will be described with reference to the flowchart of FIG.

After photographing, the camera microcomputer 102 first determines in step S31 whether or not the interchangeable lens 2 is still attached. If the interchangeable lens 2 is still attached, the process proceeds to step S32, where the lifting mirror 108 is moved. The liquid crystal monitor 105 is held at the retracted position, and in the next step S33, the liquid crystal monitor 105 can be used again. Then, in the next step S34, the attached state of the interchangeable lens 2 is checked, and if the attached lens is still attached, the process proceeds to step S35 to be in a photographing standby state.

If the interchangeable lens 2 is not attached in step S31, or if it is determined in step S34 that the interchangeable lens 2 has been removed during the above operation, the process proceeds to steps S36 and S37. Proceed,
While the lifting mirror 108 is held at the retracted position, the operation standby state is set.

According to the above embodiment, when the interchangeable lens is attached, the lens interferes with the information specific to the lens, specifically, the movement of the lifting mirror 108 from the interchangeable lens. It is determined from the unique information whether or not the lens is likely to hinder or break, and in the case of a lens that does not have such a risk, the raising / lowering mirror 108 is caused to enter the imaging optical path, and An image is observed in the finder section 109.

On the other hand, in the case of a lens which may cause the above-described problem, the lifting mirror 108 is kept at the retracted position, so that the above-described problem such as breakage can be eliminated. In addition, since the back focus is not restricted when designing the interchangeable lens, the optimal optical type can be selected, and the optical performance can be improved.

In such a case, the CCD 101
The image is displayed using the LCD monitor 105 and the LCD monitor 105. Therefore, even if the image cannot be confirmed by the optical viewfinder 109, the image can be confirmed and photographed without any problem.

When the interchangeable lens is removed after the photographing is completed, the lifting mirror 108 is moved to the retracted position and held, so that when the interchangeable lens is mounted again next time, the interchangeable lens will be removed. Even if the interchangeable lens interferes with the lift mirror, the next operation can be smoothly performed without damaging the lift mirror and the interchangeable lens.

(Modification) In the above embodiment, the liquid crystal monitor 105 is arranged at a position facing the appearance of the camera body 1 so that the photographer can directly observe it. It is also possible to adopt a configuration in which the optical path inside the unit 109 is switched and observation is performed via an eyepiece and a prism. In this case, there is an advantage that the photographer can confirm the composition of the photographing without taking his eyes off the optical finder section 19.

[0053]

As described above, claims 1 to 4, 8
According to any one of the inventions described in any one of (1) to (11), (15) and (16), the optical performance of the lens can be improved, It is possible to provide a camera system, a camera, or a lens that can prevent the mirrors from being damaged by interference.

According to the invention described in any one of the second, sixth, twelfth, and thirteenth aspects, not only the confirmation of the image with the optical finder but also the confirmation of the image using the output of the photoelectric conversion element is performed. It is possible to provide an obtained camera system or camera.

According to the seventh or fourteenth aspect of the present invention, even if the image cannot be confirmed by the optical finder, the image can be confirmed by the image display means. Can be provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a camera system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram when an interchangeable lens different from that of FIG. 1 is attached to the camera body of FIG. 1;

FIG. 3 is a flowchart illustrating an operation of the camera microcomputer according to the first embodiment of the present invention.

4 is a flowchart showing a process after a release operation of the camera microcomputer when the interchangeable lens shown in FIG. 1 is attached.

5 is a flowchart showing a process after a release operation in a camera microcomputer when the interchangeable lens shown in FIG. 2 is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera main body 2, 3 Interchangeable lens 101 CCD 102 Camera microcomputer 108 Elevating mirror 105 LCD monitor 113 Image signal processing circuit 203 Lens microcomputer 303 Lens microcomputer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03B 19/02 G03B 19/02 F term (Reference) 2H018 AA32 2H044 AE07 2H054 AA01 CB18 CC01 CD03 2H101 EE08 EE21 5C022 AB43 AC02 AC03 AC09 AC42 AC54 AC73 AC78

Claims (18)

[Claims] 1. A camera body having an elevating mirror for guiding a photographing light beam to an optical finder by being normally located at a retreat position outside a photographing optical path and being advanced from the retreat position into the photographing optical path, and the camera body A camera system comprising a combination with a lens detachably attached to the lens, wherein the lens has information transmission means for transmitting unique information of the lens, and the camera body is provided with the lens unique information from the information transmission means. A camera system comprising: a discriminating unit for discriminating the position of the moving mirror; 2. A camera body having an elevating mirror which is normally located at a retracted position outside a photographing optical path, and which is guided from the retracted position into the photographing optical path to guide a photographing light beam to an optical finder. In a camera system comprising a combination with a detachable lens, information indicating whether the lens has a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. The camera body has a discriminating means for discriminating the information from the information transmitting means, and the discriminating means causes the lens to move to the entrance position of the lifting mirror. Elevating mirror position control means for holding the elevating mirror at the retracted position when it is determined that the elevating mirror has a structure that causes interference. Camera system characterized by having a. 3. A camera body having an elevating mirror which is normally located at a retracted position outside the photographing optical path and which is guided into the photographing optical path from the retracted position to guide a photographing light beam to an optical finder. In a camera system comprising a combination with a detachable lens, information indicating whether the lens has a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. The camera body has a discriminating means for discriminating the information from the information transmitting means, and the discriminating means causes the lens to interfere with the entrance position of the lifting mirror. If it is determined that the structure has no influence, the lifting mirror position control unit moves the lifting mirror to the entrance position. Camera system characterized by a means. 4. A camera body having an elevating mirror for guiding a photographic light beam to an optical finder by being normally located at a retreat position outside the photographing optical path and being made to enter the photographing optical path from the retracted position, and the camera body In a camera system comprising a combination with a detachable lens, information indicating whether the lens has a structure that interferes with a moving area of the lifting mirror when the lens is attached to the camera body. The camera body has a discriminating means for discriminating the information from the information transmitting means, and the discriminating means causes the lens to move to the entrance position of the lifting mirror. If it is determined that the mirror has a structure that causes interference, the lifting mirror is held at the retracted position, and the lens is moved up and down. A lift mirror position control means for moving the lift mirror to the approach position if it is determined that the mirror has a structure that does not affect the interference with the approach position. And camera system. 5. The camera system according to claim 2, further comprising a photoelectric conversion element that receives a photographing light beam and outputs an image signal. 6. A photoelectric conversion device comprising: a photoelectric conversion element for receiving a photographing light beam and outputting an image signal; and image display means for displaying an image based on a signal from the photoelectric conversion element. 5. The camera system according to any one of 4. 7. A photoelectric conversion device for receiving a photographing light beam and outputting an image signal, and image display means for displaying an image based on a signal from the photoelectric conversion element, wherein the lens is determined by the determination means. If it is determined that the mirror has a structure that interferes with the movement of the lifting mirror to the entry position, the image display means is driven to control the image control means for allowing a photographer to observe an image. The camera system according to claim 2, further comprising: 8. The lift mirror position control means moves the lift mirror to the retracted position and holds the mirror at that position when the lens is removed from the camera body. 5. The camera system according to 4. 9. A camera having an elevating mirror for guiding a luminous flux to an optical finder by being normally located at a retracted position outside a photographic optical path and being advanced from the retracted position into the photographic optical path to be attached to the camera. Whether the lens has a structure in which the unique information of the lens is taken in from the lens and the lens interferes with the movement of the lifting mirror to the entry position when the lens is attached to the camera body based on the unique information. Determining means for determining whether the lens has a structure that interferes with the movement of the elevating mirror to the entry position,
A camera, comprising: a lift mirror position control unit that holds the lift mirror at the retracted position. 10. The apparatus is usually located at a retracted position outside a photographing optical path,
In a camera having an elevating mirror that guides a photographing light beam to an optical finder by being made to enter the photographing optical path from the retracted position, the unique information of the lens is taken in from a lens attached to the camera. When the lens is attached to the camera body, determining means for determining whether the lens has a structure that interferes with the movement of the lifting mirror to the entry position, A camera, comprising: a lift mirror position control unit that moves the lift mirror to the approach position when it is determined that the structure does not affect the interference with the approach position. 11. Normally, it is located at a retracted position outside the optical path for photographing,
In a camera having an elevating mirror for guiding a luminous flux to an optical finder by being made to enter the photographic optical path from the retracted position, the camera obtains the unique information of the lens from a lens attached to the camera, and When the lens is attached to the camera body, a discriminating means for discriminating whether or not the lens has a structure that interferes with the movement of the elevating mirror to the entry position; and If it is determined that the lifting mirror has a structure that interferes with the movement of the lifting mirror to the entrance position, the lifting mirror is held at the retracted position, and the lens is moved to the entrance position of the lifting mirror. If it is determined that the mirror has a structure that does not affect the interference, the lifting mirror is moved to the approach position. A camera comprising a lifting mirror position control means. 12. A photoelectric conversion device according to claim 9, further comprising a photoelectric conversion element for receiving a photographing light beam and outputting an image signal.
A camera according to any one of the preceding claims. 13. A photoelectric conversion device comprising: a photoelectric conversion element for receiving a photographing light beam and outputting an image signal; and image display means for displaying an image based on a signal from the photoelectric conversion element. 12. The camera according to any one of 11). 14. A photoelectric conversion element for receiving a photographing light beam and outputting an image signal; image display means for displaying an image based on a signal from the photoelectric conversion element; If it is determined that the image display device has a structure that interferes with the movement to the approach position, the image display device may have an image control unit that drives the image display unit and allows a photographer to observe the image. The camera according to any one of claims 9 to 11, wherein: 15. The lift mirror position control means moves the lift mirror to the retracted position when the lens is removed, and holds the mirror at that position. The camera according to. 16. When attached to the camera according to any one of claims 9 to 11, information indicating whether the camera has a structure that interferes with a moving area of a lifting mirror provided in the camera is transmitted. A lens having information transmission means for performing the operation. 17. The camera system according to claim 1, wherein the normal state is a state in which the lens is not attached to the camera body. 18. The camera according to claim 9, wherein the “normal” is a state in which the lens is not attached to the camera.