JPH03192231A - Camera - Google Patents

Abstract

PURPOSE:To remove polarized light component by moving the rotating position of a polarizing filter and stopping the rotating position of the polarizing filter at the rotating position where the photometry output value of a photometry means is minimum. CONSTITUTION:A light beam shown by an alternate long and short dash line which is made incident on a photographing lens 1 passes the polarizing filter 7 having vibration components in all the directions and reaches mirrors 13 and 14 as the light beam having only one vibrating direction. The light beam reflected by the mirror 13 passes a focusing glass 12, a pentagonal prism 11 and a finder ocular lens 15. The light beam reflected on the mirror 14 reaches an AF sensor 18. Then, the rotating position of the polarizing filter is stopped at the position where the photometry output value of the photometry means of the camera becomes minimum. Thus, the polarized light component is removed, the operability is improved, and instantaneous photographing ability is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a camera that rotates a polarizing filter and stops the polarizing filter at a rotational position where the amount of light passing through the polarizing filter is minimized.

[Prior Art] Generally, reflected light from water surfaces, glass surfaces, painted surfaces, etc. is polarized, so a polarizing filter can be attached in front of a photographic lens to remove the reflected light. All you have to do is rotate the polarizing filter attached to the front of the photographic lens by hand to block reflected light and take a picture. For example, you can remove the reflected light and take a clear picture of a subject in a shop window or underwater. I can do it.

In addition to the above-mentioned uses, polarizing filters are also used to sufficiently bring out the texture of the surface of objects or to adjust the brightness of the blue sky by blocking polarized light.

[Problems to be Solved by the Invention] When a polarizing filter is used in the above-mentioned conventional camera, the rotation of the polarizing filter is manually performed, which has the disadvantage of lacking instantaneous photographing ability. In addition, polarizing filters have an ND effect, so if you take pictures with the polarizing filter attached at low brightness, the shutter speed will be slow and there is a risk of camera shake, so you will need to remove the polarizing filter, which is time-consuming. was.

[Means for Solving the Problems] The camera of the present invention includes a rotatable polarizing filter inserted into a photographing optical path and having a rotation center parallel to the photographing optical axis;
a photometer that measures subject light through a polarizing filter;
and rotational position moving means for moving the rotational position of the polarizing filter and stopping the polarizing filter at a rotational position where the photometric output value of the photometric means is minimized.

The camera also includes a retracting means that allows the polarizing filter to be retracted out of the photographing optical path.

Furthermore, when the polarizing filter is inserted into the photographing optical path, the retracting means retracts the polarizing filter out of the photographing optical path when the photometric output value is less than or equal to a predetermined value.

Further, when the polarizing filter is retracted outside the photographing optical path, the retracting means inserts the polarizing filter into the photographing optical path when the photometric output value is equal to or higher than a predetermined value.

[Operation] By stopping the rotational position of the polarizing filter at the position where the photometric output value of the photometric means is the minimum, the polarized light component can be removed.

Furthermore, by making the polarizing filter retractable out of the photographing optical path, photographing can be performed without using the polarizing filter.

In addition, when the first optical filter is inserted in the photographing optical path, by retracting the polarizing filter out of the photographing optical path when the photometric output value is less than a predetermined value, the polarizing filter can be removed when it is undesirable to use the polarizing filter. Use can be prevented.

Also, if the polarizing filter is retracted outside the photographing optical path,
By inserting the polarizing filter into the photographing optical path when the photometric output value is greater than or equal to a predetermined value, the polarizing filter can be used when it is desirable to use the polarizing filter.

[Example] Next, the present invention will be described with reference to the drawings. 1st
The figure is a circuit configuration diagram showing an embodiment of the camera of the present invention, and FIG. 2 is a sectional view of the camera in the same embodiment.

In FIG. 1, 51 is a CPU that controls each part, 52 is an exposure control unit that controls exposure, 53 is an AE photometry circuit that measures subject light, and 56 is a high frequency signal superimposed on the photometry signal from the AE photometry circuit 53. Component 2 A filter that removes and smoothes the flickering component caused by a light source such as a fluorescent lamp, 5
Reference numeral 4 denotes a defocus amount detection circuit that detects the in-focus state (out of focus ff1) of the photographing lens with respect to the subject, and 55 a focusing circuit that detects the in-focus position of the photographic lens, that is, the distance at which the subject is in focus. This is a position detection circuit. Reference numeral 57 denotes a filter adjustment completion display circuit that indicates that adjustment of the polarizing filter, which will be described later, has been completed. 4 is a focusing motor (Ml), 10 is a polarizing filter drive motor (M2) (hereinafter referred to as a drive motor), and 11 is a film feeding motor (M3), and these three motors are controlled by a motor drive circuit by the CPU 51. 58. swp is the main switch that turns on the camera. SWO is a polarized photography switch that consists of a slide switch, etc., and allows you to select and set either polarized photography using an I-light filter or normal photography without a polarizing filter when shooting. Normal shooting is set when shooting and off.SWI is a half-press switch, SW2 is a full-press switch, and SW3 and SW4 detect whether the polarizing filter is inserted or retracted in the shooting optical path. This is a filter position detection switch (hereinafter referred to as a detection switch).

When the polarizing filter is inserted into the photographing optical path, the detection switch SW3 is turned on and SW4 is turned off. (When the I-light filter is retracted from the photographing optical path, the detection switch SW3 is turned off and SW4 is turned on. SW5 is the shooting mode switch, and when shooting using a polarizing filter,
Enable shutter priority mode, which prioritizes the shutter if you press the shutter while the polarizing filter is moving to its optimal rotational position, or disabling the shutter until the polarizing filter has moved to its optimal rotational position You can select whether to use filter priority mode.

In FIG. 2, a male threaded portion 2a formed on the outer periphery of the lens chamber 2 that holds the photographic lens 1 is engaged with a female threaded portion 5a formed on the inner periphery of the cylindrical portion 5b of the photographic lens base 5. It supports the photographic lens system. A focusing motor 4 is fixed to the camera lens base 5, and a pinion gear 3 press-fitted into the motor shaft of the focusing motor 4 meshes with a gear 2b formed in the lens chamber 2 to control the rotation of the focusing motor 4 through the lens. Transmit to chamber 2. As the lens chamber 2 rotates, the lens 1 moves back and forth in the optical axis direction along the male screw portion 2a to perform focusing. Further, a rotary base 6 is cylindrically engaged with the outer periphery of the cylindrical portion 5b of the photographic lens base 5. Although not shown in FIG. 2, a predetermined conductor pattern formed on the rotating base 6 and a contact brush provided on the polarizing filter come into contact with each other as the polarizing filter rotates.
A shaft 7a formed in a polarizing filter is inserted into a hole 6a formed in the rotating base 6, and the polarizing filter 7 is configured to be rotatable around the hole 6a. That is, the polarizing filter 7 rotates around an axis 7a, which is a rotation center parallel to the optical axis indicated by a chain line. A drive ring 8 is cylindrically engaged with the outer periphery of the rotating base 6 and is configured to be freely rotatable. The drive ring 8 has an outer toothed portion 8a formed on its outer periphery, and an inner toothed portion 8b formed on its inner periphery. The filter support portion 21 is attached to the rotating base 6. The polarizing filter 7 and the driving ring 8 are sandwiched and held between the photographing lens base 5 and the photographic lens base 5 so that they do not come off in the optical axis direction. Further, the external teeth 8a of the drive ring 8 are engaged with a binion gear 9 press-fitted onto the motor shaft of the polarizing filter drive motor 10, so that the rotational force of the polarizing filter drive motor 10 is transmitted to the drive ring 8. , an internal toothed portion 8b of the drive ring 8 meshes with a sector gear portion 7b formed on a portion of the polarizing filter 7. Therefore, the rotational force of the drive ring 8 is transmitted to the polarizing filter, thereby causing the polarizing filter 7 to rotate around the axis 7a.

As shown in FIG. 2, the light beam shown by the dashed dotted line that enters the photographic lens 1 from the left side of the page has vibration components in all directions, but by passing through the polarizing filter 7, it only vibrates in one direction. Become a ray of light and mirror 13
．． 14. The light beam reflected by the mirror 13 is focused on the focusing glass 12. Pentaprism 11. and passes through the finder eyepiece 15. Further, the light beam reflected by the mirror 14 reaches the AF sensor 18. Further, 16 is an AF lens that collects light for photometry, 17 is an AE light receiving element that receives light and detects brightness, 19 is a film, and 20 is a focal plane shutter.

3(a) to 3(C) are plan views of the same embodiment, and correspond to the view seen from the mirror 13Ws to the filter 7 side in FIG. 3, and FIG. 3(a) is a plan view of the polarizing filter. 7 is completely retracted from the optical path, FIG. 3(b) is a state where polarizing filter 7 is inserted into the optical path, and FIG. 3(C) is a state where polarizing filter 7 is inserted into the optical path.
The polarizing filter 7 inserted into the optical path is rotated almost clockwise 9
A state rotated by 0° is shown.

In FIGS. 3A to 3C, the circle indicated by a broken line on the polarizing filter 7 indicates the range of the photographing optical path when the polarizing filter 7 is inserted into the photographing optical path. Also, 6
b and 6c are limit bins that limit the rotation angle of the polarizing filter. When the polarizing filter 7 comes into contact with the limiting pin 6b, the polarizing filter 7 is completely inserted into the photographing optical path, and the polarizing filter 7 is in the limiting bin. 6c, the polarizing filter 7 has completely retreated from the photographing optical path. Also, 2
2a, 22b, 22c are 3 formed on the upper surface of the rotating base 6.
Contact brushes 21a, 21b21 are two conductor patterns and are integrally formed in the contact forming portion 7c of the polarizing filter.
This is arranged so as to be in contact with the detection switch SW3.c shown in FIG. Compatible with SW4.

Next, the operation of inserting the polarizing filter 7 into the photographing optical path and moving its rotational position will be described.

First, assume that the polarizing filter 7 is in a completely retracted state as shown in FIG. 3(a). At this time, the contact brush 21
conductive patterns 22a and 22c are electrically connected by a and 21c, and the detection switch SW4 is turned on, and the electrically conductive patterns 22a and 22b are non-conductive, and the detection switch SW3 is turned on.
is off.

In this state, the drive motor 1o rotates forward and the pinion gear 9
When rotates counterclockwise, this rotational force is transmitted to the sector gear portion 7b of the polarizing filter 7 through the drive ring 8, so that the polarizing filter 7 rotates clockwise about the axis 7a. As a result, as shown in FIG. 3(b), the polarizing filter 7 comes into contact with the restriction pin 6b and stops, and the polarizing filter 7 is completely inserted into the photographing optical path. At this time,
Conductive pattern 22a by contact brushes 21a and 21b
and 22b are electrically connected and the detection switch SW3 is turned on, and the conductor patterns 22a and 22c are electrically non-conductive and the detection switch SW4 is turned off.

Furthermore, when the binion gear 9 rotates counterclockwise, the rotating base 6 rotates clockwise together with the drive ring 8. As a result, the polarizing filter 7 rotates together with the rotating base 6 as shown in FIG. 3(C). At this time, detection switch SW3. The on/off state of SW4 remains the same as in the case of FIG. 3(b).

Note that if the drive motor 10 is reversed in the state shown in FIG. 3(c), the polarizing filter 7 will be retracted from the photographing optical path, contrary to the above, and the detection switches SW3 and SW4 will be turned on and
The off state also returns to the initial state.

Next, specific operations will be explained with reference to flowcharts shown in FIGS. 4 to 8. Figure 4 is the main flowchart, Figure 5
6 is a flowchart of a normal photographing processing routine that does not use a polarizing filter, FIG. 6 is a polarizing photographing processing routine that uses a polarizing filter, FIG. 7 is a subroutine for filter priority mode, and FIG. 8 is a subroutine for shutter priority mode.

The main flowchart shown in FIG. 4 will be explained. The operation starts when the main switch SWP of the camera is turned on. It is determined whether the main switch SWP is on or off (step lot), and if it is off, the operation is terminated, and if it is on, the polarization switch SWO is turned on.

If it is on, identify whether the half-press switch SWI is on or off (Step 10)
9) If the half-press switch SW1 is off, the process returns to step 101, and if it is on, the process moves to polarization photographing processing step 110 shown in FIG. In step 102, if the polarizing filter switch SWO is off, the detection switch SW3 for detecting the position of the polarizing filter 7 is identified (step 103); if it is on, the polarizing filter 7 is inserted in the photographing optical path, so the drive motor In step 104), identify whether the detection switch SW4 is on or off. If it is off, return to step 104; if it is on, the polarizing filter 7 has been completely retracted from the photographing optical path, so the drive Step 106) to stop the motor 10; step 107') to identify whether the half-press switch SWI is on or off; if it is off, return to step 101; if it is on, proceed to the normal photographing process (step 108) shown in FIG. and step 10
Return to 1. If the detection switch SW3 is off in step 103, the polarizing filter 7 has already been retracted and not inserted into the photographing optical path, so the process moves to step 107 and the above-described process is executed.

Next, the normal photographing process shown in Fig. 5 (step 1 in Fig. 4) is performed.
The 0 normal photographing process described with respect to the flowchart of 08) is a normal photographing process in which the polarizing filter 7 is not used.

First, a focusing operation and a photometry operation are performed (step 20).
1,202>, it is determined whether the half-press switch SW1 is on or off (step 203'), and if it is on, it is determined whether the full-press switch SW2 is on or off (step 204), and whether the full-press switch SW2 is on or not If it is off, the exposure operation and film winding operation are executed (steps 206 and 207), and if it is off, the process returns to step 203. If the half-press switch SW1 is turned off in step 203, this photographing operation is ended and the process returns to the main flowchart of FIG.

Next, the polarization photographing process shown in Fig. 6 (step 1 in Fig. 4) is performed.
10) The flowchart will be explained. The polarization photographing process is a photographing process performed using the polarizing filter 7.

First, the operation starts when the polarization photographing switch SWO is turned on and the half-press switch SWI is turned on. First, a focusing operation and a photometry operation are performed (steps 301 and 302), and the detection switch SW3 for detecting the position of the polarizing filter 7 is turned on.

It is determined whether it is off (step 303), and if it is on, the polarizing filter 7 is inserted into the photographing optical path, so the process moves to step 304 in which the correction amount is read out (step 305), and if it is off, the polarizing filter 7 is It has been evacuated from the photographing optical path, and the process moves directly to step 304 to calculate the LV value (step 304).

Here, the LV value will be explained. This LV value is L, V = BV + SV
fl) (where B■: brightness value, S■: value given by film sensitivity value), that is, by this LV value calculation, Step 3
The values ``■'' and ``■'' which are the sum of the brightness value BV determined in the photometry operation of 02 and the sensitivity value S■ of the film are determined.

Note that when photometry is performed with the polarizing filter inserted, the photometry value will be one aperture darker than before the insertion, and the LV value will be smaller. This will cause a difference in the determination results in step 306 even for the same subject, so step 304 It becomes necessary to read out the correction and perform the correction.

If the LV value obtained in step 304 is smaller than the predetermined value, the brightness is low and the polarizing filter effect cannot be expected, so it is necessary to move the polarizing filter 7 out of the photographing optical path in order to reduce the influence of camera shake. There is.

Therefore, it is determined whether the detection switch SW3 is on or off, and if it is on, the polarizing filter 7 is inserted into the photographing optical path, so the drive motor 10 is reversed (step 317).
), determine whether the detection switch SW4 is on or off (step 318); if it is off, return to step 317;
If it is on, the polarizing filter 7 has been retracted, so the drive motor 1'0 is stopped (step 319), the 'It' command operation is performed (step 320), and the film winding operation is performed (step 321), as shown in FIG. Return to the main flowchart. If it is off in step 316, the polarizing filter 7
Since it has been retracted out of the photographing optical path, the process moves to step 320 and the same operation as above is executed.

Further, when the LV value obtained in step 304 is greater than or equal to the predetermined value, the subject brightness is such that a photographing effect can be expected by inserting the polarizing filter 7, so the detection switch SW3
Step 307) determines whether the detection switch SW4 is on or off, and if it is off, rotates the drive motor 10 in the normal direction to insert the polarizing filter 7 into the photographing optical path (step 30g). 309
), if it is off, the process returns to step 308, and if it is on, since the polarizing filter 7 has been inserted, the drive motor 10
to stop (step 310), perform photometry operation (step 311), calculate LV value (step 312),
The LV value is substituted into LVo (step 313), and this LVo value is stored in memory (step 314).

On the other hand, if the detection switch SW3 is turned on in step 307, the polarizing filter 7 is inserted into the photographing optical path, so the process directly proceeds to step 311 and the same operation as described above is performed. Next, in step 314, the setting of the photographing mode switch SW5 is determined (step 315). If the filter priority mode is selected, the process moves to the flowchart of FIG. 7, and if the shutter priority mode is selected, the process moves to the flowchart of FIG. 8.

In the above operation, LV value determination was performed, but the flow chart of the photographing operation in filter priority mode, which is related to filter sensitivity (BV value determination may also be performed), will now be described.

As mentioned above, when shooting with a polarizing filter, if you press the shutter while the polarizing filter is moving to its optimal rotational position, the filter priority mode This is a shooting mode that disables the shutter.

First, the drive motor 10 is rotated in the normal direction to rotate the rotational position of the polarizing filter 7 (step 401>, count value n=
Set it to 0 (step 402), press the switch halfway
Determine whether I is on or off (step 403'); if off, return to the main flowchart in Figure 4; if on, perform photometry (step 404); Compare the LVo and LV recorded in the memory at step 314 in the figure (step 4
06), if LV is less than or equal to LVo, compare the count value n with O (Step 407); if this count value n is greater than or equal to 0, replace the value of LVo with LV (Step 415)
, 1 is added to the count value n (step 416).
, returns to step 403, and if the count value n is smaller than 0, it means that the minimum value of the LV value has been detected.
Displaying the completion of filter adjustment (step 408),
Stop the drive motor 10 (step 409), and determine whether the half-press switch SW1 is on or off (step 41)
0), if it is off, the process returns to the main flowchart of FIG. 4, and if it is on, it is determined whether the full-press switch SW2 is on or off (step 411), and if it is off, the process returns to step 410, and if it is on, the exposure operation is performed (step 411). step 412)
Step 413: Delete the filter adjustment completion display.
), wind the film (step 414), and return to the main flowchart of FIG. LV in step 406
is LV. If the count value n is greater than 0, the count value n is compared with 0 (step 417), and if the count value n is less than 0, the LVo
Replace the value of n with LV (step 420), subtract 1 from the count value n (step 421), and step 4
Return to 03. If the count value n is greater than 0 in step 416, it means that the minimum value of the LV value has been detected.
Displaying the completion of filter adjustment (step 418)
, the drive motor 10 is stopped (step 419), and the process proceeds to step 417, where the same operation as above is performed.

Next, a flowchart of the photographing operation in the shutter priority mode shown in FIG. 8 will be explained.

Shutter priority mode is a shooting mode in which, as mentioned above, when shooting using a polarizing filter, if you press the shutter while the polarizing filter is moving to its optimal rotational position, the shutter will be given priority when shooting. It is.

Comparing the shutter priority mode shown in FIG. 8 with the filter priority mode shown in FIG.
10, and the drive motor 10 is stopped (step 5).
10), Meanwhile, in step 504, fully press switch SW2
The only difference is that if is off, a photometric operation is performed (step 505), and the other operations are exactly the same as in FIG. That is, priority is given to shutter operation by determining whether the full-press switch SW2 is on or off in step 504. Note that since the explanation of FIG. 8 overlaps with that of FIG. 7, the explanation thereof will be omitted.

FIG. 9 is a plan view of a polarizing filter showing an example of accurately determining the rotational position of the polarizing filter.

The polarizing filter 7' is formed into a disk shape, and the polarizing filter 7'
Encoders 24a, 24b, 24c, and 24d are formed concentrically with the polarizing filter 7'' on the outer periphery surrounding the photographing optical path of the rotary base 6, and are provided with conducting parts and non-conducting parts alternately according to a predetermined angle. A contact brush 25 formed in the above is configured to run on this encoder.The contact brush 25 conducts the encoder according to the rotation angle, thereby changing the rotation position of the polarizing filter to a predetermined angle, rJi4, for example, 45. In addition, an encoder 22 is provided on the pinion gear 9 that rotates the polarizing filter 7', and the amount of rotation of this encoder 22 is detected by a photointerrupter 23.
Since the minute rotation of ′ is detected, the minute rotation angle can be determined. With this configuration, the rotational position of the polarizing filter 7' can be known more accurately.

Therefore, for example, if a subject has multiple polarization components, it is possible to detect the direction of the polarization components from the ups and downs of changes in photometric values due to rotation of the polarization filter and the rotational position of the polarization filter. By storing the rotational position of the polarizing filter, it is possible to immediately return the rotational position of the polarizing filter to a position that cuts a specific polarized light component.

In the embodiment, a TTL photometry method is adopted, but the method is not limited to this. A polarizing filter is placed in front of the photographic lens, and the light that has passed through the polarizing filter is received by an external light receiving element. A similar effect can be obtained by using an external photometry method.

In addition, in the embodiment, the polarizing filter is automatically rotated, but if you want to do it manually,
It is only necessary to link the polarizing filter with the half-press operation of the release button. For example, the polarizing filter may be configured to be driven by a certain amount with one half-press operation, and to be driven continuously if the half-press operation continues for a certain period of time.

In addition, when using a multi-photometry method in which the photometry area is composed of two or more pattern areas and the photometry output of each pattern area is detected independently, various algorithms such as those listed below are applied. be able to.

When the photometric area is composed of a central part and a peripheral part, priority is given to the photometric value in the central part, assuming that the subject is present in the central part. In other words, since the direction of the polarized light component differs between the center and the periphery, even if the tendency of change in photometric values due to rotation of the polarizing filter differs between the center and the periphery, the photometric value at the center will be the minimum. The rotational position of the polarizing filter is stopped at the position where the polarizing filter is rotated.

When there is a difference in the amount of change in the photometric value of each pattern area in multiple pattern areas due to the rotation of the polarizing filter,
It is assumed that there is a polarized light component to be removed by the polarizing filter in the pattern region with the largest amount of change, and the polarizing filter is stopped at the position where the photometric value becomes the minimum in this pattern region with the largest amount of change.

An identification means is provided to distinguish between the sky side and the ground side in the photographing area, and the photometry area is configured to be divided into the sky side and the ground side. When you want to take a dark photograph of a photometric area, the polarizing filter is stopped at the position where the photometric value is minimum in the photometric area on the top side, giving priority to the photometric value in the photometric area corresponding to the top side.

[Effects of the Invention] As explained above, according to the camera of the present invention, the polarization component can be removed by stopping the rotational position of the polarization filter at the position where the photometry output value of the photometry means is the minimum. Therefore, there is no need to rotate the polarizing filter by hand, which improves operability and improves instant shooting.

Further, by making the polarizing filter retractable out of the photographing optical path, it is possible to perform photographing without using the polarizing filter without manually removing the polarizing filter, thereby improving operability.

In addition, when a polarizing filter is inserted in the photographing optical path, the polarizing filter can be moved out of the photographing optical path when the photometric output value is below a predetermined value, allowing the use of a light leakage filter when it is undesirable to use the polarizing filter. can be prevented. In addition, if the polarizing filter is retracted outside the photographing optical path, the polarizing filter can be used when it is desirable to use it by inserting the polarizing filter into the photographing optical path when the photometric output value is above a predetermined value. be able to. Therefore, there is no need to manually remove or attach photometric filters one by one depending on the brightness value of the subject, and it is possible to easily take pictures using polarizing filters.

[Brief explanation of drawings]

FIG. 1 is a horizontal circuit diagram showing an embodiment of the camera of the present invention, FIG. 2 is a sectional view of the camera in the same embodiment, and FIGS. 3(a) to (c) are plan views of the same embodiment. Fig. 4 is a main flowchart showing the operation in the same embodiment, Fig. 5 is a flowchart of a normal photographing processing routine that does not use a polarizing filter, Fig. 6 is a polarizing photographing processing routine that uses a polarizing filter, and Fig. 7 is a filter priority processing routine. The mode subroutine, FIG. 8 is a shutter priority mode subroutine, and FIG. 9 is a plan view of a polarizing filter in another embodiment. 6... Rotating base, 6a... Hole, 6b, 6c... Limiting bin, 7,7°... Polarizing filter, 7a... Axis,
7b... Sector gear part, 8... Drive ring, 8'a...
・External tooth part, 8b...Internal tooth part, 9... Binion gear,
10...Polarizing filter drive motor, 16...AEm
Optical lens, 17... Light receiving element, 2.1a, 21b, 2
1cm・-Contact brush, 22a, 22b, 22cm--
Conductor pattern, 51--CPU, 53--AE photometry circuit, 57--Filter adjustment completion display circuit, SWO.
...Polarization photography switch, SW3. SW4...detection switch, SW5...shooting mode switch. Figure 2 Figure 4

Claims (4)

[Claims] (1) A rotatable polarizing filter that is inserted into the photographing optical path and has a rotation center parallel to the photographing optical axis; a photometer that measures subject light through the polarizing filter; and moving the rotational position of the polarizing filter. A camera characterized by comprising: rotational position moving means for stopping the polarizing filter at a rotational position where the photometric output value of the photometry means is minimum. (2) The camera according to claim 1, further comprising a retracting means that allows the polarizing filter to be retracted out of the photographing optical path. (3) In claim 2, when the polarizing filter is inserted into the photographing optical path, the retracting means retracts the polarizing filter out of the photographing optical path when the photometric output value is less than or equal to a predetermined value. Featured camera. (4) In claim 2, when the polarizing filter is retracted outside the photographing optical path, the retracting means prevents the polarizing filter from being inserted into the photographing optical path when the photometric output value is a predetermined value or more. Featured camera.