JP3079581U - Polarization effect confirmation tool - Google Patents

Abstract

(57) [Summary] [Problem] To enable a photographer to accurately grasp the inclination of the direction of the polarization grating selected by the photographer, and to change the polarization filter of the photographing camera by the inclination of the direction of the polarization grating selected by the photographer. Attaching it to a lens and making it easy to properly determine the exposure when using the polarizing filter. A polarization filter for a camera sets a scale reference point at a position around a filter frame at a predetermined angle with respect to a direction of a polarization grating of a polarizing plate, and a filter from the scale reference point. A scale 5 is provided along the frame 2a at a position that is at a constant angle with respect to the direction of the polarization grating. In the polarization effect checking filter 3, the method of setting the scale reference point 6 and attaching the scale 7 is different from that of the camera polarization filter 2. I did the same.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a tool for confirming the polarization effect when taking a picture.

[0002]

[Problems to be solved by the invention]

 2. Description of the Related Art Conventionally, a camera polarizing filter has been used for removing reflection of a subject or increasing contrast in photographing. This camera polarizing filter has a polarizing plate attached to the filter frame, and can be rotated in front of the lens by rotatably fitting the filter frame to the lens frame of the photo camera. By rotating, the direction of the polarizing grating of the polarizing film in the polarizing plate changes with respect to the photographic camera, and the obtained effect differs depending on the rotation angle. Since the effect varies depending on the positional relationship between the subject, the photographic camera, and the light source, when using a camera polarizing filter, the photographer adjusts the angle of the camera polarizing filter for each photographing.

By the way, in a single-lens reflex camera equipped with a camera polarizing filter, the effect of the filter can be confirmed while looking through a viewfinder due to its structure. Therefore, the photographer can set the rotation angle of the filter as desired, and can easily take a photograph intended by the photographer.

On the other hand, in a range finder camera or the like, the effect of the polarizing filter cannot be confirmed even when looking through the finder because the line of sight from the finder does not pass through the polarizing filter. Also, it is difficult to confirm the effect of the polarizing filter on the focus glass with a large-format photo camera such as a 4x5 camera (because the lens of a large-format photo camera has a dark F-number). Therefore, when using a polarizing filter, rotate the polarizing filter against your eyes before attaching the polarizing filter to the lens of these photo cameras, and turn the polarizing filter when the photographer's intended effect is obtained. I remember how much it was rotated. Usually, the characters printed on the filter frame of the polarizing filter are used as a guide. Then, after attaching the polarizing filter to the lens of the photographic camera, the photographing is performed by rotating the polarizing filter with reference to the character or the like so that the turning degree becomes the same as the stored turning degree. However, in this case, the memory of the degree of rotation of the polarizing filter is ambiguous, and the state determined by eye contact, that is, the inclination of the direction of the polarizing grating of the polarizing filter and the lens attached to the photographic camera and set. In many cases, the inclination of the direction of the polarization grating is deviated from that when the photographing is performed, and there is a disadvantage that the photographing is performed differently from the photographer's intention.

[0005] Furthermore, in taking a photograph, exposure is often determined first by using a single exposure meter. When attaching a polarizing filter to a single-lens reflex camera used for shooting or the above large format photo camera, first attach the polarizing filter to the lens of the photo camera (and hit the eye with a rangefinder camera or 4X5 camera etc.) While checking the effect of the filter, determine the degree of rotation of the polarizing filter and store the state. Next, the polarizing filter is applied to the light-receiving part of the single exposure meter (if it is attached to a single-lens reflex camera, it is applied and applied), and the exposure is measured by setting it with the previously stored rotation. In this case, as described above, the inclination of the direction of the polarization grating of the polarization filter selected by the photographer in advance is different from the inclination of the direction of the polarization grating when applied to a single exposure meter, and the exposure determination is accurate. There is also a disadvantage that it is not. In view of the above circumstances, the present invention has been made to enable the photographer to accurately grasp the inclination of the direction of the polarization grating selected by the photographer. The purpose is to attach a polarizing filter to the lens of a photographic camera, and to easily determine an appropriate exposure when using the polarizing filter.

[0006]

[Means for Solving the Problems]

 The present invention has been made in consideration of the above problems, and comprises a camera polarizing filter in which a polarizing plate is mounted on a filter frame, and a polarizing effect confirmation filter in which a polarizing plate is mounted on an annular frame. The filter sets a scale reference point around the filter frame at a predetermined angle with respect to the direction of the polarization grating of the polarizing plate, and sets a direction of the polarization grating along the filter frame from the scale reference point. A scale is provided at a position that is at a constant angle with respect to, and the polarization effect confirmation filter is provided around the annular frame in the camera polarization filter with respect to the direction of the polarization grating of the polarizing plate of the polarization effect confirmation filter. A scale reference point is set at a position at the same angle as the predetermined angle at which the scale reference point is set, and the polarization effect confirmation filter is arranged along the annular frame from the scale reference point. A polarization effect confirmation tool characterized in that the scale is provided at a position that is at the same fixed angle as the angle of the scale in the camera polarizing filter with respect to the direction of the polarization grating. Is to be eliminated.

[0007]

[Embodiment of the invention]

 Next, the present invention will be described in detail based on the embodiment shown in FIG. In the figure, reference numeral 1 denotes a polarization effect checking tool, which is a camera polarizing filter 2 in which a polarizing plate 2b is mounted on a filter frame 2a, and a polarizing effect in which a polarizing plate 3b is mounted on an annular frame 3a. And a confirmation filter 3. The camera polarizing filter 2 has a scale reference point 4 consisting of a triangular mark on the outer peripheral surface of the filter frame 2a in a direction B at an angle of 90 ° with respect to the direction A of the polarizing grating at the center of the polarizing plate 2b. Is set. Further, a scale 5 is provided at a position from the scale reference point 4 at an angle of 10 ° with respect to the direction A of the polarizing grating along the outer peripheral surface of the filter frame 2a. The directions 5 extend in the opposite directions over a range C of 120 °, and the scale 5 is displayed as a numerical value at every 20 ° angle.

The polarization effect checking filter 3 also has the same configuration as that of the camera polarizing filter 2, and is disposed at the front surface of the annular frame 3 a at 90 ° with respect to the polarization grating direction A at the center of the polarizing plate 3 b. A scale reference point 6 consisting of a triangular mark is set at the position of the angle direction B. The polarizing film used for the polarizing plate 3b is the same as the polarizing film used for the polarizing plate 2b of the polarizing filter 2 for a camera. Further, in the polarization effect checking filter 3, a scale 7 is provided at a position at an angle of 10 ° from the scale reference point 6 along the front surface of the annular frame 3a with respect to the direction A of the polarization grating. The scale 7 extends in the opposite direction from the scale reference point 6 over a range C of 120 °, and the scale 7 is displayed as a numerical value at every 20 ° angle. As described above, in the polarization effect checking filter 3, the method of setting the scale reference point 6 and providing the scale 7 is the same as that of the camera polarizing filter 2. In the drawing, reference numeral 8 denotes a handle, which is attached to the annular frame 3a at a position facing the scale reference point 6.

[0009] For a large-sized photo camera such as a range finder camera or the like in which a photographer's line of sight from a finder does not pass through a lens, or a polarizing filter with a focusing glass such as a 4x5 camera where it is difficult to check the effect of a polarizing filter. The procedure for taking an image using the polarization effect checking tool 1 will be described below. (1) Attach the polarizing filter 2 for the camera to the lens of the photo camera and determine the composition. (2) The photographer turns the polarizing effect checking filter 3 so that a desired effect can be obtained while the photographer puts the polarizing effect checking filter 3 on his / her eyes and checks a subject or the like. At this time, the polarizing filter for camera 2 attached to the lens of the photographic camera that captures the subject and the polarizing effect checking filter 3 are set as parallel as possible. (3) When the intended effect is obtained in the polarization effect checking filter 3, the scale 7 positioned directly above (or right beside) is checked. (4) The photographing is performed by turning the scale 5 immediately above (or right beside) of the camera polarizing filter 2 so as to be the same as the scale 7 confirmed in the above (3).

Next, a description will be given of an exposure determination method when a single exposure meter is used. Note that this is for shooting with a polarization effect using a single-lens reflex camera. When determining the exposure using a single exposure meter when shooting with a polarization effect using the rangefinder camera or 4 × 5 camera, etc., use the polarization effect confirmation filter 3 in (3) above as a single exposure. Exposure measurement may be performed against the meter. (1) Attach the camera polarizing filter 2 to the lens of a photo camera (single-lens reflex camera), and determine the composition. (2) Turn the camera polarizing filter 2 so that the desired effect can be obtained while looking through the viewfinder and confirming the subject. (3) When the intended effect is obtained in the camera polarizing filter 2, the scale 5 located directly above (or right beside) is confirmed. (4) The polarization effect confirmation filter 3 is applied to the light receiving portion of the single exposure meter, and the scale 7 immediately above (or right beside) the polarization effect confirmation filter 3 is the same as the scale 5 confirmed in the above (3). The exposure is measured as follows. At this time, the polarizing filter for camera 2 attached to the lens of the photographic camera that captures the subject and the polarizing effect checking filter 3 are made to be as parallel as possible. (5) Shoot with the exposure determined in (4).

[0011]

[Effect of the invention]

 As described above, according to the polarization effect checking device of the present invention, the camera comprises a polarizing filter for mounting a polarizing plate on a filter frame and a polarizing effect checking filter for mounting a polarizing plate on an annular frame. The polarizing filter sets a scale reference point on the periphery of the filter frame at a predetermined angle with respect to the direction of the polarization grating of the polarizing plate, and sets the direction of the polarization grating along the filter frame from the scale reference point. A scale is provided at a position that is at a constant angle with respect to the scale, and the polarization effect confirmation filter is provided around the annular frame with respect to the direction of the polarization grating of the polarizing plate of the polarization effect confirmation filter. The scale reference point is set at the same angle as the predetermined angle at which the reference point is set, and the scale reference point of this polarization effect confirmation filter is In which characterized in that a graduation at positions which every same constant angle as having a scale in the polarization filters for the camera with respect to the direction of polarization grating along the annular frame. As described above, the polarization effect checking tool of the present invention can easily visually check the inclination of the polarization grating direction of the camera polarization filter and the inclination of the polarization grating direction of the polarization effect confirmation filter on the scale. Therefore, when taking photographs with a rangefinder camera or a 4x5 camera, using this polarizing effect checking tool makes it easier and more accurate to obtain a polarizing effect that matches the photographer's intention. You can take photos. In addition, even if you want to obtain a polarization effect when taking a picture using a single exposure meter, you can easily and more accurately determine the exposure with this polarization effect confirmation tool. This is an effect that is excellent in practicality.

[Brief description of the drawings]

FIG. 1 shows an example of a polarization effect checking tool according to the present invention, wherein (a) is an explanatory view showing a polarizing filter for a camera,
(B) is an explanatory view showing a polarization effect checking filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tool for confirming polarization effect 2 ... Polarizing filter for camera 2a ... Filter frame 2b ... Polarizing plate 3 ... Filter for confirming polarization effect 3a ... Annular frame 3b ... Polarizing plate 4, 6 ... Scale reference point 5, 7 ... Scale A ... Polarization grating Direction B: Direction of scale reference point

Claims (1)

[Utility model registration claims] 1. A polarizing filter for a camera in which a polarizing plate is mounted on a filter frame, and a polarizing effect confirmation filter in which a polarizing plate is mounted on an annular frame, wherein the polarizing filter for the camera is provided around the filter frame. A graduation reference point is set at a position that is at a predetermined angle with respect to the direction of the polarization grating of the plate, and a graduation is provided at a position that is at a constant angle with respect to the direction of the polarization grating along the filter frame from the graduation reference point. The polarization effect checking filter is positioned around the annular frame at the same angle as the predetermined angle at which the scale reference point in the camera polarizing filter is set with respect to the direction of the polarization grating of the polarizing plate of the polarizing effect checking filter. The reference point is set in the direction of the polarization grating along the annular frame from the reference point of the polarization effect checking filter. Polarization effects confirmation tool, characterized in that a graduation at positions which every same constant angle as having a scale in use polarizing filters.