JPH05297445A - Camera - Google Patents

Abstract

PURPOSE:To accurately calculate the dimension of an object inclined to the optical axis of a camera without making the camera large and rising cost by calculating the dimension of the object, based on some distance informations measured at different times, and the size of a scale means. CONSTITUTION:In a two-point dimension mode, first A-point as one end of the part of the object 49 desired to measure, is made coincident with an AF frame, to obtain a distance x1, based on a defocusing amount detected by a focus detecting part, a lens driving amount DELTAx detected by a lens driving amount detecting part, and a focal distance (f) outputted from a focal distance outputting part. Then, B-point as the other end of the part of the object 49 desired to measure, is made coincident with the AF frame, to obtain a distance x2, based on the defocusing amount detected by a measurement detecting part, the lens driving amount DELTAx detected by the lens driving amount detecting part, and the focal distance (f) outputted from the focal distance outputting part. The dimension between the points A and B on the object 49, can be obtained by using these obtained distances.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera for displaying or recording the distance to a subject or the size of the subject.

[0002]

2. Description of the Related Art Conventionally, as a camera having a function of measuring the size of a subject, the camera is provided with a distance measuring means, and data such as a distance to the subject and a focal length of a photographing lens and a finder are provided.
A camera has been proposed which calculates the size of a subject from the scale length data set in the display, displays it in the viewfinder, and records it on the film surface (JP-A-62-2).
59004). However, the above-mentioned camera is premised on that the subject is orthogonal to the optical axis, and an error occurs in the subject tilted with respect to the optical axis. In order to solve such a problem, a camera has been proposed which detects the tilt of the subject by measuring the distances of a plurality of points of the subject and corrects the subject size (see Japanese Patent Application No. 3-122295).

[0003]

However, the above-mentioned camera requires a plurality of distance measuring devices to measure a plurality of points of the object, and therefore, there is a problem that the camera becomes large and the cost becomes high.

[0004]

In order to solve the above problems, the present invention provides a distance detecting means for detecting a distance from a camera to a predetermined point of an object, and a scale means as a reference for dimension measurement on a finder. Storage means for storing a plurality of distance information measured by the distance detecting means at different times, and calculating means for calculating the size of the subject based on the plurality of distance information and the size of the scale means. It is characterized by having.

[0005]

According to the above arrangement, the size of the subject tilted with respect to the optical axis of the camera can be accurately calculated without increasing the size and cost of the camera.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a camera to which the present invention is applied will be described below.

FIG. 1 is a block diagram showing the structure of a camera to which the present invention is applied. (31) is a camera body. (1) is a taking lens. In this embodiment, the taking lens (1) is a zoom lens having a focal length of 35 mm to 200 mm. Reference numeral (28) is a focal length detection unit which outputs the focal length of the taking lens (1). Reference numeral (2) is a quick return mirror, which reflects light rays that have passed through the taking lens (1) to the focusing screen (3). Part of the quick return mirror (2) is semi-transmissive and part of the incident light is A
The light is transmitted toward the F sub-mirror (7). The light beam that has passed through the focusing screen (3) and the dimension measurement mark display device (32) is guided to the eyepiece lens (5) for observing the finder image through the pentaprism (4). A display device (6) displays the measured subject distance, dimensions, exposure information, etc. in the finder. Dimension measurement mark display device (3
In 2), the dimension measurement mark is displayed on the viewfinder screen using the liquid crystal. The light beam reflected by the AF sub-mirror (7) enters the focus detection unit (8). The focus detection unit (8) forms the light rays incident from two different positions of the photographing lens on the image sensor, and detects the focused state from the interval between the two images. The focus detection section (8) has a plurality of focus detection areas. The defocus amount is output from the focus detection unit (8) to the microcomputer (9).
A lens driving unit (10) performs focusing by driving the taking lens (1) based on a signal from the microcomputer (9). The drive amount information from the reference position of the photographing lens (1) is obtained by the lens drive amount detection unit (1
It is output to the microcomputer (9) by 1).

(16) The switch S0 is turned on by touching a release button (not shown) with a finger. When the switch S0 (16) is turned on, photometry and distance measurement are started. (12) is turned on by pressing the release button halfway with switch S1. When the switch S1 (12) is turned on, the object distance or the object size is measured and the measured value is displayed. (13) is turned on by fully pressing the release button with switch S2. Switch S2 (13) is ON
By doing so, the exposure operation of the camera is activated. (1
A mode switch SMOD 4) is a switch for switching the operation mode of the camera. There are four operation modes. The first mode is a normal camera mode that operates as a normal camera, the second mode is a distance mode in which the distance from the film surface to the object is measured and recorded, and the third mode is the plane where the object is located is the taking lens (1 ) One-point size mode for measuring and recording the dimensions of the subject when it is orthogonal to the optical axis, and the fourth mode is the subject when the plane with the subject is not orthogonal to the optical axis of the taking lens (1). This is a two-point size mode for measuring and recording the size of. Switch SM
Every time the OD (14) is turned on, distance mode → 1-point dimension mode → 2-point dimension mode → normal camera mode → distance mode →
You can switch to.

(15) is a data imprinting unit, which imprints the date when the camera is in the normal camera mode and imprints the measured data when the camera is in the measurement mode. (33) is the dimension measurement mark changeover switch SMA
The RK is for selecting the size of the dimension measurement mark used in the dimension measurement. A data input switch SDAT (37) is used in the two-point size mode and is used to input the measured distance. (38) is AF
The area switching switch SAREA is used to set the AF area in the normal camera mode.

FIG. 13 is a diagram showing a focus detection area.
(39) is the field of view of the finder. (40), (4
1) and (42) are focus detection areas, respectively. (4
0) is the first island, (41) is the second island,
Let (42) be the third island. FIG. 14 is a diagram showing a dimension measurement mark display device (32). (43) is a size display mark display device, (19a), (19b), (44
a) and (44b) are dimension measurement marks. Liquid crystal is used in this display device (45) is a common electrode, (4)
6) and (47) are the dimension measurement marks (19a),
The selection electrodes of (19b), (44a), and (44b). Interval W between dimension measurement marks (19a) and (19b)
1 is 20 mm, and the interval W2 between (44a) and (44b) is 1.
It is 0 mm.

Next, the operation of the camera to which the present invention is applied will be described with reference to the flow charts of FIGS. The camera is normally in the camera mode in the activated state. When the mode changeover switch SMOD (14) is turned ON, the mode changeover switch ON is detected at # 10, and the mode is changed at # 20 as described above. In # 40, the OFF of the mode changeover switch SMOD (14) is detected and the process proceeds to # 50. When the mode changeover switch SMOD (14) is OFF in # 10, the process proceeds to # 50. # 50
Then, the state of the AF area changeover switch SAREA (38) is checked, and when it is ON, the process proceeds to # 60 and is turned OFF.
If so, proceed to # 90. In # 60, the AF area is changed as described above. # 80 SAREA (3
Wait for 8) to turn off and proceed to # 90. In # 90 and # 100, the camera mode is checked, and if it is the one-point size mode or the two-point size mode, the process proceeds to # 105, and if neither, the process proceeds to # 135. In # 135, the display of the dimension measurement mark is erased and the process proceeds to # 140. A in # 105
Check the status of the F-area changeover switch SMMARK (33). If it is ON, proceed to # 110. If it is OFF, # 1.
Proceed to 15. In # 110, the dimension measurement mark is changed as described above and displayed in # 115. In # 130, the size measurement mark changeover switch SMMARK (33)
Wait until is turned off and proceed to # 140.

At # 140, the state of S0 (16) is checked, and if it is ON, the routine proceeds to # 150. # 140 S0
When (16) is OFF, the process proceeds to # 190 and S1 (1
The state of 2) is checked. # 190 S1 (12)
When is OFF, the process returns to # 10, and when S1 (12) is ON, the process proceeds to # 150. In # 150, photometry is performed, and #
At 160, the exposure information is displayed. In # 170, AF is performed using the set AF island. # 1
At 80, the state of S1 (12) is checked, and when it is OFF, the process returns to # 10, and when it is ON, the process proceeds to # 190. # 1
At 90, the camera mode is checked. If the camera mode is the distance mode in # 190, the distance subroutine of # 195 is executed, and if it is not the distance mode, it is left in # 20.
Go to 0. In # 200, the camera mode is checked 1
In the point size mode, the one-point size subroutine of # 210 is executed. If not in the one-point size mode, # 22 is left as it is.
Go to 0. In # 220, the state of S1 (12) is checked. When it is OFF, the process returns to # 10, and when it is ON, # 2.
Proceed to 30. In # 220, when S1 (12) is OFF, # 10
The reason for returning to is that the measurement can be redone. In # 230, the camera mode is checked. In the two-point size mode, the two-point size subroutine in # 240 is executed.
Go to 0. In # 250, the process waits for S2 (13) to be turned ON, and proceeds to # 260. In # 260, the camera mode is checked. In the distance mode, the process proceeds to # 270, and in the other modes, the process proceeds to # 280. In # 270, the distance data is imprinted and the process proceeds to # 330. In # 280, the camera mode is checked, and in the one-point size mode, # 2
90. If it is another mode, proceed to # 300. # 2
At 90, the dimension data is imprinted, and the process proceeds to # 330.
In # 300, the camera mode is checked. If it is the two-point size mode, proceed to # 310, and if it is another mode, # 3.
Go to 20. In # 310, the dimension data is imprinted,
Go to # 330. In # 320, the date is imprinted and the process proceeds to # 330. In # 330, the subject is exposed to the film, and the process proceeds to # 340. At # 340, the film is wound up and the process returns to # 10. Next, the operation of the distance subroutine will be described with reference to the flowchart of FIG.

The photographing lens (1) is reset at ∞ in # A10, and the process proceeds to # A20. ∞ The reset operation contents are
After the focusing of the taking lens (1) is driven to the reference position, the lens drive amount of the lens drive amount detection unit (11) is reset to zero. In # A20, AF is performed using only the second island of the plurality of focus detection areas of the focus detection unit (8), and the flow proceeds to # A30. #
The subject distance is calculated in A30, displayed on the display device (6) in # A40, and the process returns in # A60.

Next, the operation of the one-point size subroutine will be described with reference to the flowchart of FIG.

The photographing lens (1) is reset at ∞ in # B10, and the process proceeds to # B20. In # B20, AF is performed using only the second island of the plurality of focus detection areas of the focus detection unit (8), and the process proceeds to # B30. In # B30, the size of the subject is calculated, and in # B40, the display device (6) is displayed.
Is displayed, and the process returns with # B60.

Next, the operation of the two-point size subroutine will be described with reference to the flowcharts of FIGS. 23 and 24.

The photographing lens (1) is reset at ∞ in # C10, and the process proceeds to # C20. In # C20, AF is performed using only the second island of the plurality of focus detection areas of the focus detection unit (8), and the flow proceeds to # C30. The distance of the subject is calculated in # C30, and the display device (6) is displayed in # C40.
Is displayed and the process proceeds to # C50. # C50: S1 (1
The state of 2) is checked. When it is OFF, the process proceeds to # C60, and when it is ON, the process proceeds to # C70. # C60 is S1
If the state of (12) is checked and it is OFF, the procedure returns to # C10 for re-measurement. # C60 to S1 (12)
When is ON, the process proceeds to # C70. In # C70, the state of the data input switch SDAT (37) is checked and O
When it is FF, it returns to # C50, and when it is ON, it proceeds to # C80. # C80 stores the distance of the first point, and then # C9
The process proceeds to 0, blinks the display of the display device (6) 5 times to notify that the data input is completed, and proceeds to # C100.

In C100, the data input switch SDA
Wait for T (37) to turn off and proceed to # C110. In # C110, after waiting for S1 (12) to be turned off, the process proceeds to # C120. In # C120, the process waits for S1 (12) to be turned ON, and then proceeds to # C130. After infinite resetting of the taking lens (1) in # C130, # C1
At 40, AF is performed using only the second island of the focus detection unit (8), and the process proceeds to # C150. The distance of the subject is calculated in # C150, displayed on the display device (6) in # C160, and the process proceeds to # C170. # C170: S1 (12)
If the state is checked and is OFF, the procedure proceeds to # C180, and if it is ON, the procedure proceeds to # C190. # C180 is S
The state of 1 (12) is checked, and when it is ON, the process returns to # C130 to redo the measurement. # C180 to S1
When (12) is OFF, the process proceeds to # C190. # C19
At 0, the state of the data input switch SDAT (37) is checked, and when it is OFF, the process returns to # C170, and when it is ON, the process proceeds to # C193. In # C193, after the distance of the second point is stored, the process proceeds to # C195. In # C195, AF is performed using the set AF island, and
Proceed to 200. In # C200, the size of the subject is calculated, displayed in # C210, and the process proceeds to # C220. # C2
In S20, the state of S2 (13) is checked. If it is OFF, the process returns to # C195, and if it is ON, the process proceeds to # 230.
Return with # C230.

Next, a method of calculating the subject distance and an example of measurement will be described.

FIG. 6 is a diagram showing the position of the optical system after AF is completed. (26) is the subject, (21) is the film surface, H1 and H2 are the front principal points of the taking lens (1),
The rear principal point is shown. If the defocus amount is DEF, the lens drive amount from the ∞ position is Δx, the focal length of the taking lens is f, and the principal point interval is H, the distance from the front principal point of the taking lens (1) to the subject (26). x is a lens imaging formula 1 / x + 1 / (f + Δx + DEF) = 1 / f, and is solved for x to obtain x = f · f / (Δx + DEF) + f ··· (Equation 1). Therefore, since the distance D from the film surface to the subject (26) is D = x + H + f + Δx, D = f · f / (Δx + DEF) + H + 2f + Δx ··· (Equation 2) ..

FIG. 5 is a view of the finder in the distance mode in which AF is completed in step # 170 of the flowchart. (17) is a viewfinder frame, and (6) is a display device, which is the same as the display device (6) of FIG. (18) is an AF frame, and (20) is a subject image. Exposure data (shutter speed, aperture value) on the display device (6)
Is displayed. When the subject whose distance is to be measured is placed in the AF frame and the release button is half-pressed to turn on the switch S1, the lens is reset and AF is performed as described above. Then, the defocus amount DEF,
The lens drive amount Δx, the focal length f, and the subject distance D obtained by the above (Equation 2) are displayed on the display device (6). At this time, f = 200 mm, H = 50 mm, Δx = 0.7 m
m and DEF = 0.016 mm, D = 56.3 m
become. FIG. 7 shows a finder image at this time. On the display device (6), the distance (56.3M) is displayed together with the letter D indicating the distance mode. When the release button is pressed and the switch S2 is turned on, the subject distance D is imprinted on the photograph as described above. FIG. 8 shows a photograph in which the distance is imprinted. (22) is a photo (2
0) is a subject image. (23) is the imprinted data, and the object distance (56.3M) is imprinted together with the letter D indicating the distance mode.

Next, a method of calculating dimensions in the one-point dimension mode and an example of measurement will be described.

FIG. 9 is a view of the finder in the one-point size mode. (17) is the viewfinder frame, (19
a) and (19b) are dimension measurement marks, (24) is a subject image, and (6) is a display device. FIG. 10 shows the positional relationship among the taking lens, the subject (25), and the subject image (24) at this time. Now, the dimension measurement marks (19a), (19b)
Since the portion of the subject image (24) to be measured coincides with the mark, the dimension of the subject can be calculated by L = xW / (f + Δx) (Equation 3) ..

FIG. 9 is a viewfinder display after AF is completed in step # 170 in the one-point size mode. (17) is a viewfinder frame, (24) is a subject image, (19a) and (19b) are dimension measurement marks,
(6) is a display device. In the one-point distance measurement mode, since the dimension measurement is performed based on the distance W between the dimension measurement marks, it is necessary to make the dimension measurement mark and the portion on the subject where the dimension measurement is desired to match. This is done by zooming the taking lens (1) or changing the taking distance. In addition, the size measurement mark depends on the size of the subject (19a)
Either (19b) or (44a) or (44b), whichever is more appropriate, is used for the dimension measurement mark changeover switch SMMARK.
Select by (33). Since this operation is performed in the loop of the above-mentioned flowcharts # 10 to # 180, # 1
AF is continuously performed by 70, and even if the subject distance is changed, the subject is not out of focus. FIG. 9 shows a state after the dimension measurement marks (19a) and (19b) have already been adjusted so that the portions on the subject image (24) whose dimensions are to be measured coincide with each other.

In this state, when the release button is half-depressed and the switch S1 (12) is turned on, the ∞ reset and AF of the taking lens (1) are performed as described above. Then, from the defocus amount DEF, the lens drive amount Δx, the focal length f, the principal point interval H, and the size W of the dimension measurement mark, the dimension L of the subject is obtained by (Equation 1) and (Equation 3), and the display device ( Display in 6). At this time f = 46 mm, H
= 2 mm, Δx = 1.8 mm, DEF = 0.034 m
If m and W = 20 mm, then L = 50.2 cm.
FIG. 11 shows a finder image at this time. On the display device (6), the dimension (50.2 CM) is displayed together with the letter L indicating the dimension mode L. Here, when the release button is pressed and the switch S2 (13) is turned on, the dimensions are photographed. FIG. 12 shows a photograph in which the dimensions are imprinted. (22) is a photograph and (24) is a subject image. (30a) and (30b) are size measurement marks, which are imprinted to show the measured portion of the subject image (24). (29) is the imprinted data, and the dimension (50.2 CM) is shown together with the letter L indicating the dimension mode.
Is imprinted.

Next, a method of calculating dimensions and a measurement example in the two-point dimension mode will be described.

FIG. 15 is a viewfinder display in the two-point size mode. (17) is a finder frame, (19a),
(19b) is a dimension measurement mark, and (48) is a subject image. On the display device (6), the dimension (4.65M) is displayed together with the letter L indicating the dimension mode. FIG. 9 shows the state when # C10 of the two-point size subroutine is completed. The part you want to measure on the subject is the dimension measurement marker.
(19a) and (19b).

FIG. 16 shows the taking lens (1), the subject (49) and the subject image (48) on the focusing screen (3) at this time.
Shows the relationship. Point A and point B are both ends of a portion on the subject (49) where dimension measurement is desired. The points A ′ and B ′ are points where the points A and B are projected on the focusing screen (3), respectively. x1 and x2 are points A and
It is the distance to point B. f is the focal length of the taking lens (1), Δx is the drive amount from the reference position of the taking lens (1),
L is the distance between points A and B on the subject. W1 is a dimension between points A ′ and B ′ on the focusing screen. θ is an angle at which straight lines drawn from the taking lens (1) to the points A and B intersect. At this time, L is calculated by L = √ (x1 · x1 + x2 · x2-x1 · x2 · cos θ) (Equation 4). Here, cos θ is cos θ = 2 / (1 + tan (θ / 2) · tan (θ / 2)) − 1 (Equation 5), and tan (θ / 2) is tan (θ / 2) = W1 / (2 · (f + Δx)) (Equation 6) Therefore, by substituting (Equation 5) and (Equation 6) into (Equation 4), L can be calculated from x1, x2, W1, f, and Δx.

If x1 and x2 are measured using the distance measuring function of the camera, W1 is the dimension measurement mark (19a),
It is known because it is the distance between (19b), f is from the focal length output unit (28), and Δx is the lens drive amount detection unit (1
Since it is output from 1), the value of L can be calculated. When (44a) and (44b) are used as the dimension measurement marks, W1 in (Equation 6) may be replaced with W2.

A measurement example in the two-point size mode will be described with reference to the flow charts of FIGS. 2, 3, 4, 23 and 24. When the camera is activated, the mode is set to the normal camera mode, the AF area is set to the wide area, and the dimension measurement marks are set to (19a) and (19b). In this state, the camera mode and AF area can be changed. When the mode changeover switch SMOD (14) is turned on twice to switch to the two-point size mode, the two-point size mode is set and the size measurement marks (19a) and (19b) are displayed. To switch the dimension measurement mark, turn on and off the dimension measurement mark changeover switch SMMARK (33).
You can operate with FF. Next, observe the subject (49) with the viewfinder, and use the zoom operation of the taking lens (1), switching of the dimension measurement marks, changing the subject distance, and the like Match the measurement mark. At this time, since the camera sequence loops from # 10 to # 180,
Due to the AF of # 170, the subject (49) is always in focus. The viewfinder display at this time is shown in FIG. Exposure information is displayed on the display device (6).

Next, one end of the portion of the subject (49) to be measured is aligned with the AF frame (18) and S1 (1
Turning on 2) will reset the taking lens (1) to ∞ (#C
After 10), AF is performed using only the second island (# C20). In # C30, focus detection unit (8)
Defocus amount DEF detected by the defocus amount D detected by the lens drive amount detection unit (11)
EF, the lens drive amount Δx detected by the lens drive amount detection unit (11), and the focal length f output from the focal length output unit (28) are used to calculate (Equation 1) to calculate the distance x.
1 is obtained and displayed at # C40 (see FIG. 18). FIG.
Then, the letter D indicating that the data is distance and the distance (1
0.44M) is displayed.

If S1 (12) is turned on again, # C1
You can go back to 0 and re-measure x1. If the value of x1 is OK, the data input switch SDAT (37) is turned on. Then, x1 is stored in the memory (# C80), and the display device (6) blinks five times to indicate that the data input is completed (# C90). Next, match the other end of the portion of the subject whose length you want to measure with the AF frame (18) and set S1 (12).
When turned on, the shooting lens (1) is reset ∞ (#
After C130), AF is performed using the second island (# C140). In # C150, the defocus amount DEF detected by the measurement detection unit (8), the lens drive amount Δx detected by the lens drive amount detection unit (11) and the focal length f output from the focal length output unit (28) are set. Based on Equation 1, the distance x2 is calculated and displayed at # C160 (see FIG. 19). In this example, x2 = 10.11 m. In FIG. 19, the character D indicating that the data is distance and the distance (10.11M) are displayed.

Here, if S1 (12) is turned on again, # C1
You can go back to 30 and re-measure x2. If the value of x2 is OK, the data input switch SDAT (37) is turned on. Then, after the second point distance is stored in # C193, the process proceeds to # C195. In # C195, the first and second distances x2 and W1
From the focal length f output from the focal length output unit (28) and the lens drive amount Δx output from the lens drive amount detection unit (11), using (Equation 4), (Equation 5), and (Equation 6), , The dimension L between the points A and B on the subject (49) is calculated, and #
It is displayed on the display device (6) at C210. Before turning on S2, it is confirmed that the dimension measurement marks (19a) and (19b) and the point to be measured on the subject (49) match, and if they are deviated, the taking lens ( Re-adjust by zooming in 1). During this time, the camera sequence loops between # C195 and # C220, and displays the recalculated values of L one after another. At this time, f = 43 mm, Δ
If x = 0.18 mm, W1 = 20 mm, so L
= 4.65m. FIG. 15 shows a finder image at this time. On the display device (6), the dimension L (4.65 m) is displayed together with the letter L indicating the dimension mode.

[0034]

As described above, according to the present invention, the distances to a plurality of points of a subject are measured and stored at different times, and the subject size is calculated. Therefore, the size of the camera is not increased and the cost is not increased. It is possible to accurately calculate the size of the subject tilted with respect to the axis.

[Brief description of drawings]

FIG. 1 is a block diagram showing a structure of a camera.

FIG. 2 is a flowchart showing the operation of the camera.

FIG. 3 is a flowchart showing the operation of the camera.

FIG. 4 is a flowchart showing the operation of the camera.

FIG. 5 is a diagram showing an example of a finder before performing distance measurement in a distance measurement mode.

FIG. 6 is a principle diagram of distance measurement.

FIG. 7 is a diagram showing an example of a finder after performing distance measurement in a distance measurement mode.

FIG. 8 is a diagram showing an example of a photograph taken in a distance measuring mode.

FIG. 9 is a diagram showing an example of a finder before performing dimension measurement in the one-point dimension mode.

FIG. 10 is a principle diagram of dimension measurement.

FIG. 11 is a view showing an example of a finder after performing dimension measurement in the one-point dimension mode.

FIG. 12 is a diagram showing an example of a photograph taken in the one-point size mode.

FIG. 13 is a diagram showing a focus detection area.

FIG. 14 is a diagram showing a dimension measurement mark display device.

FIG. 15 is a diagram showing an example of a photograph taken in a two-point size mode.

FIG. 16 is a principle diagram of dimension measurement.

FIG. 17 is a diagram showing an example of a finder before measurement is performed in the two-point size mode.

FIG. 18 is a diagram showing an example of the finder after the distance measurement at the first point is performed in the two-point size mode.

FIG. 19 is a diagram showing an example of the finder after the distance measurement at the second point is performed in the two-point size mode.

FIG. 20 is a diagram showing an example of a photograph taken in the two-dimensional mode.

FIG. 21 is a flowchart of a distance subroutine.

FIG. 22 is a flowchart of a one-point size subroutine.

FIG. 23 is a flowchart of a two-point size subroutine.

FIG. 24 is a flowchart of a two-point size subroutine.

[Explanation of symbols]

 1 Photographic lens 49 Subject 48 Subject image x1, x2 Subject distance θ Viewing angle of subject △ x Lens drive amount H Distance between principal points f Focal length W1 Size of measurement mark

Claims (1)

[Claims] 1. A distance detecting means for detecting a distance from a camera to a predetermined point of an object, a memory means for storing a plurality of distance information measured by the distance detecting means at different times, and a storage means on the finder. A camera comprising: a scale unit serving as a reference for dimension measurement; and a calculating unit for calculating the dimension of the subject based on the plurality of distance information and the size of the scale unit.