JP3196096U - Mount adapter - Google Patents

Abstract

Provided is a mount adapter capable of mounting a lens used in Contarex to a Leica M and adjusting a diaphragm. A mount adapter joint portion 110 joined to a camera body, an interchangeable lens mount portion 120 joined to a lens, an aperture ring 131 that is engraved with an aperture value and located on the outer periphery and movable in a circumferential direction, It has an interlocking pin 132 that is located on the inner periphery and moves in the circumferential direction in conjunction with the aperture ring. The mount adapter joint 110 conforms to the Leica M standard, and the interchangeable lens mount 120 is made of Contarex. It conforms to the standard of the lens mount, and the relative position of the interlocking pin 132 with respect to the lens joint surface 121a is relative to the aperture pin on the side of the contour body with respect to the lens joint surface when the lens is mounted on the contour body. It is adjusted to be equivalent to the general positional relationship. [Selection] Figure 4

Description

  The present invention relates to a mount adapter used by being attached between a camera body and an interchangeable lens having different lens mount standards.

  A device that is attached between a camera body and an interchangeable lens having different lens mount standards so that an interchangeable lens having a lens mount standard different from that of the camera body can be used in the camera body is called a mount adapter. The mount adapter is designed to provide compatibility between products sold before the standard change and products sold after the standard change when the lens mount standard is changed. There are lenses for attaching a lens of a different manufacturer from the main body, an old name lens, and a favorite lens (for example, see Patent Document 1). The mount adapter generally has a function of mechanically attaching an interchangeable lens to the camera body, and power, electric power, and power for enabling functions such as automatic aperture, aperture interlock, exposure meter interlock, and autofocus, Many signals and signals are not transmitted.

  When an interchangeable lens with a long flange back [distance from the lens mount mounting surface (lens mounting surface) to the imaging surface (film surface or sensor surface)] is attached to the camera body with a short flange back, the length of the mount adapter By matching the length with the difference in length of the flange back, the optical characteristics can be matched. Conversely, if an interchangeable lens with a short flange back is attached to a camera body with a long flange back, or if there is only a slight difference in the length of the flange back, even if the mount adapter length is as short as possible, The problem arises that the general characteristics cannot be matched. If an interchangeable lens with a long flange back is mechanically attached to a camera body with a short flange back, it is equivalent to using a close-up ring from an optical viewpoint, and the focus cannot be achieved at infinity. Dedicated to shooting. There is also a method of absorbing the difference of flange back by incorporating a correction lens in the mount adapter, but the last lens that is said to have a particularly large effect on the finish of the photo becomes a non-genuine lens, so it is not much It's not a good way. Further, such a method is not desirable, particularly when an old name lens is used, because the characteristics of the lens will change.

  On the other hand, the Contarex old lenses that were sold by Zeiss Icon are all made by Carl Zeiss except for PA-Kurtagon 35mmF4 provided by Schneider Kreuznach, and have unique color development and excellent descriptive power. There are many established lenses. Therefore, there is a demand for using an old lens for Contarex by mounting it on a general-purpose silver-lead camera or digital camera in recent years.

  In March 2013, Leica M (Typ240) (registered trademark) was newly released. Leica M is the latest digital range finder camera from Leica Camera, which is equipped with a 35mm full-size CMOS sensor, realizing natural and vivid color reproducibility and beautiful descriptive power down to details. It has many advantages brought about by digital technology. For example, the Leica M is equipped with a live view function and a live view focus function, and can adjust the depth of field, exposure, hue, etc. while viewing the image displayed on the back LCD monitor. . In addition, by installing an option sold separately, it is possible to display an image captured by a lens in the viewfinder and perform live view shooting, and it is possible to shoot with the same feeling as a mirrorless single-lens camera. Also, because the Leica M is a rangefinder camera, there is no essential mirror for a single-lens reflex camera, so the flange back is relatively short at 27.8 mm. By attaching the genuine Leica R mount adapter “Leica R Adapter M” Leica-R lenses can be used.

JP 2009-092663 A

  The old Contourex lens has a dedicated Contourex mount, and the aperture is operated by the aperture ring on the body side. For this reason, when using an old lens for Contarex on the Leica M, there is no aperture ring on either the lens or the body side, so the aperture can be reduced simply by attaching the lens to the camera body using the mount adapter. It cannot be adjusted and must be devised.

  The present invention has been made in consideration of the above-described problems, and provides a mount adapter that can attach a lens for Contourex to the Leica M and can adjust the diaphragm. .

  The present invention is a mount adapter that is mounted between a camera body and a lens, and a mount adapter joint portion that is joined to a lens mount that is employed in the camera body, and a lens joint that is employed in the lens. The interchangeable lens mount part to which the parts are joined, the diaphragm value is engraved, the diaphragm ring is located on the outer circumference and is movable in the circumferential direction, and the inner ring is located in the circumferential direction in conjunction with the diaphragm ring in the circumferential direction. And the mount adapter joint portion has a first annular portion having a camera body joint surface, conforms to the Leica M standard, and the interchangeable lens mount portion has a lens joint surface. The interlocking pin has a relative positional relationship with respect to the lens cementing surface, and is compatible with Contourex lens mount standards. The mount adapter is adjusted so that it is equivalent to the relative positional relationship of the diaphragm pin on the side of the contourex body with respect to the joint surface of the contourex lens when the lens is attached to the contourex body. is there.

  The Leica M in the present invention means the latest digital rangefinder camera released in March 2013.

  Contarex in the present invention means a single-lens reflex camera series developed by Zeiss Icon in West Germany. For example, the final model is Contarex Super Electronic.

  In the mount adapter according to the present invention, it is preferable that a distance between the camera body joint surface of the first annular portion and the lens joint surface of the second annular portion is 17.5 mm or more and 19.0 mm or less.

  In the mount adapter of the present invention, the mount adapter joint portion is hooked on a mount claw of the camera body in a state where the camera body joint surface of the first annular portion is in contact with a lens mount surface of the camera body. A camera-side fixing member that fixes the mount adapter to the camera body, and the interchangeable lens mount portion includes a lens-side fixing member that fixes the lens to the lens joint surface of the second annular portion. preferable.

  According to the mount adapter of the present invention, a lens for Contourex can be attached to the Leica M. Therefore, the excellent lenses from the past for Contarex are installed in the latest digital rangefinder camera Leica M and all camera bodies (including silver lead cameras and digital cameras) that have the same lens mount as Leica M. The diaphragm can be used by manual photographing, and the diaphragm can be adjusted by moving the diaphragm ring of the mount adapter in the circumferential direction.

  Furthermore, according to the mount adapter of the present invention, the distance between the camera body joint surface of the first annular portion and the lens joint surface of the second annular portion is set to 17.5 mm or more and 19.0 mm or less. By attaching the lens for Contourex to the Leica M and focusing on infinity, the lens for Contourex can be used from infinity on the latest digital rangefinder camera.

  Further, according to the mount adapter of the present invention, the camera body and the lens are mechanically fixed by having the camera side fixing member for fixing the mount adapter to the camera body and the lens side fixing member for fixing the lens. can do.

It is a figure which shows the outline | summary of the mount adapter which concerns on this invention. It is the front view which looked at the mount adapter which concerns on this invention from the side attached to a camera main body. It is the reverse view which looked at the mount adapter which concerns on this invention from the side attached to an interchangeable lens. It is the side view which looked at the mount adapter concerning this invention from the side.

  Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.

<Outline of mount adapter 100>
FIG. 1 is a diagram showing an outline of a mount adapter 100 according to the present invention. In FIG. 1, a camera body 200 and an interchangeable lens 300 are shown for explanation.

  In FIG. 1, the mount adapter 100 is a device that is attached between the camera body 200 and the interchangeable lens 300 so that the interchangeable lens 300 can be used in the camera body 200.

<Description of Camera Body 200>
The camera body 200 is a general-purpose silver lead camera or digital camera in recent years, and has a lens mount (not shown) on which a dedicated lens whose lens mount standard matches that of the camera body 200 can be attached. .

  The lens mount of the camera body 200 has a dedicated lens mount surface (not shown) and a dedicated mount claw (not shown). The dedicated lens mount surface is a substantially annular plane parallel to the imaging surface (not shown), and the distance from the imaging surface is ensured to a predetermined value defined by the standard. The dedicated mount claw is a projection for fixing the dedicated lens. Here, since the camera body joint surface of the mount adapter 100 conforms to the lens mount standard of the camera body 200, the camera body joint surface of the first annular portion 111 (see FIG. 2) contacts the dedicated lens mount surface. In this state, the mount adapter 100 is attached to the lens mount of the camera body 200 by being hooked on the dedicated mount claw.

  Here, the camera body 200 can use Leica M and all camera bodies (including silver lead cameras and digital cameras) having the same lens mount as Leica M, and in particular, Leica M (Typ 240). It is desirable to use it. By using the Leica M (Typ 240) for the camera body 200, anyone can easily enjoy various old lenses using the live view focus function without worrying about distance meter interlocking.

  The Leica M mount used in the Leica M camera body is a mount for the Leica M, which is a rangefinder camera, and has a relatively short flange back of 27.8 mm. The relatively short flange back is a very useful feature in designing a mount adapter for an old lens.

<Description of Interchangeable Lens 300>
The interchangeable lens 300 is a non-dedicated lens having a lens mount standard different from that of the camera body 200, and has a lens joint portion that can be joined to a lens mount whose lens mount standard matches the interchangeable lens 300. Here, since the lens joint surface of the mount adapter 100 conforms to the lens mount standard of the interchangeable lens 300, the mount adapter 100 is secured by fixing the lens joint portion of the interchangeable lens 300 to the lens joint surface of the mount adapter 100. The interchangeable lens 300 is cemented.

  Here, a genuine Contourx lens can be used for the interchangeable lens 300, and for example, a Contarex planer 50mmF2 can be used. The lens mount used in Contarex is a bayonet B56 and a 49 mm diameter screwed joint.

<Detailed description of the mount adapter 100>
FIG. 2 is a front view of the mount adapter 100 according to the present invention as viewed from the side attached to the camera body 200.

  As shown in FIG. 2, the mount adapter 100 has a mount adapter joint portion 110 that is joined to a lens mount employed in the camera body 200. Here, the mount adapter joint portion 110 conforms to the Leica M standard and is joined to the camera body 200 that employs the Leica M mount.

  The mount adapter joint portion 110 includes a first annular portion 111 and a camera side fixing member 112. The first annular portion 111 includes a camera body joint surface 111a, a rotation restriction hole 111b, and an adapter attachment index 111c.

  The camera body joint surface 111a is a substantially annular flat surface that comes into contact with the dedicated lens mount surface of the camera body 200, and ensures the relative position of the mount adapter 100 with respect to the camera body 200 with respect to the dedicated lens mount surface. belongs to. Here, when the mount adapter 100 is attached to the camera body 200, the camera body joint surface 111a contacts the dedicated lens mount surface of the lens mount with almost no gap. Therefore, when the mount adapter 100 is attached to the camera body 200, the position of the camera body joint surface 111a and the position of the dedicated lens mount surface may be considered to be substantially the same.

  The rotation restricting hole 111 b is a hole for locking the relative rotational position of the mount adapter 100 and the camera body 200 so that the mount adapter 100 is not easily detached from the camera body 200.

  The adapter attachment index 111c is a mark used to align the relative position of the mount adapter 100 and the camera body 200 when the mount adapter 100 is attached to the camera body 200.

  The camera-side fixing member 112 is fixed to the camera body 200 by being hooked on the mount claw of the camera body 200 with the camera body joint surface 111 a in contact with the dedicated lens mount surface of the camera body 200. For example, the mount adapter 100 and the camera body 200 are relatively moved from a state in which the camera body joint surface 111a is in contact with the dedicated lens mount surface of the camera body 200 at a predetermined relative position using the adapter attachment index 111c. Rotate. Then, the mount claw of the camera body 200 and the camera side fixing member 112 are fitted, and the mount adapter 100 is fixed to the camera body 200.

  FIG. 3 is a back view of the mount adapter 100 according to the present invention as viewed from the side where it is attached to the interchangeable lens 300.

  As shown in FIG. 3, the mount adapter 100 includes an interchangeable lens mount portion 120 to which a lens joint portion (not shown) employed in the interchangeable lens 300 is joined. Here, the interchangeable lens mount portion 120 conforms to the standard of Contourex lens mount, and the interchangeable lens mount portion 120 is joined with the interchangeable lens 300 of the lens mount adopted in Contourex.

  The interchangeable lens mount unit 120 includes a second annular portion 121 and a lens side fixing member 122. The second annular portion 121 includes a lens joint surface 121a, a rotation restricting metal member 121b, and a lens attachment index 121c.

  The lens joint surface 121a is a substantially annular flat surface parallel to the camera body joint surface 111a, and secures the relative position of the interchangeable lens 300 with respect to the mount adapter 100 with respect to the lens joint surface 121a. Is.

  The rotation restricting bracket 121b is a hole for locking the relative rotational position of the mount adapter 100 and the interchangeable lens 300 so that the interchangeable lens 300 is not easily detached from the mount adapter 100.

  The lens attachment index 121 c is a mark used to align the relative positions of the interchangeable lens 300 and the mount adapter 100 when the interchangeable lens 300 is attached to the mount adapter 100.

  The lens side fixing member 122 fixes the lens joint portion of the interchangeable lens 300 to the mount adapter 100 based on the lens joint surface 121a.

  FIG. 4 is a side view of the mount adapter 100 according to the present invention as viewed from the side.

  As shown in FIG. 4, the mount adapter 100 further includes a diaphragm adjustment unit 130 that enables a diaphragm built in the interchangeable lens 300 to be adjusted.

  The aperture adjustment unit 130 includes an aperture ring 131 and an interlocking pin 132.

  The aperture ring 131 is located on the outer periphery of a cylindrical portion perpendicular to the camera main body cementing surface 111a and the lens cementing surface 121a, and is marked with an aperture value, and is movable in the circumferential direction of the cylindrical portion. The diaphragm ring 131 preferably has a diaphragm index (D in FIG. 4) and a slip stopper (E in FIG. 4).

  The interlocking pin 132 is located on the inner periphery of the cylindrical portion and moves in the circumferential direction in conjunction with the aperture ring 131.

  Further, the relative position of the interlocking pin 132 with respect to the lens cementing surface 121a is such that when the interchangeable lens 300 is attached to the contour body, the relative position of the aperture pin on the contour body side with respect to the cementing surface of the interchangeable lens 300. It has been adjusted to be equivalent to the relationship. Specifically, the interlocking pin 132 continuously moves along the circumferential direction from the position when the aperture is opened (position A in FIG. 3) to the position when the aperture is fully closed (position B in FIG. 3). (Movable range C in FIG. 3).

  Further, the distance between the imaging surface and the plane including the lens joint surface 121a in the interchangeable lens mount 120 is adjusted so that the infinite focus is achieved when the interchangeable lens 300 is attached to the camera body 200 via the mount adapter 100. It is desirable to design. For example, as shown in FIG. 4, when the flange back of the Leica M mount is 27.8 mm and the standard flange back of the lens mount adopted in Contourex is 46.0 mm, the lens joint surface 121a is theoretically included. The plane may be set to be approximately 18.2 mm (46.0 mm−27.8 mm = 18.2 mm) farther from the imaging plane than the plane including the camera body joint surface 111a. Note that a value slightly different from the theoretical value may be used in consideration of allowable blur due to the depth of field. For example, if the distance between the camera body joint surface 111a and the lens joint surface 121a is about 17.5 mm or more and 19.0 mm or less, it is possible to focus at infinity.

  As described above, when the mount adapter 100 of the present invention is used, a general-purpose camera body using a Leica M mount is used with an interchangeable lens of the lens mount standard adopted for Contourex. In addition, it is possible to focus at infinity.

DESCRIPTION OF SYMBOLS 100 Mount adapter 110 Mount adapter junction part 111 1st ring part 111a Camera body joint surface 111b Rotation restriction hole 111c Adapter attachment index 112 Camera side fixing member 120 Interchangeable lens mount part 121 2nd ring part 121a Lens joint surface 121b Rotation restriction metal fitting 121c Lens mounting index 122 Lens side fixing member 130 Aperture adjustment part 131 Aperture ring 132 Linking pin 200 Camera body 300 Interchangeable lens

Claims (3)

A mount adapter mounted between the camera body and the lens,
A mount adapter joint portion to be joined to the lens mount employed in the camera body;
An interchangeable lens mount part to which a lens joint part employed in the lens is joined;
An aperture ring that is engraved with an aperture value, located on the outer periphery and movable in the circumferential direction;
It has an interlocking pin that is located on the inner periphery and moves in the circumferential direction in conjunction with the aperture ring,
The mount adapter joint portion has a first annular portion having a camera body joint surface, conforming to the Leica M standard,
The interchangeable lens mount portion has a second annular portion having a lens joint surface, and conforms to the standard of Contourex lens mount,
The interlock pin has a relative positional relationship with respect to the lens joint surface. When the Contourex lens is mounted on the Contourx body, the relative position of the stop pin on the Contourex body side with respect to the joint surface of the Contourex lens. Mount adapter characterized by being adjusted to be equivalent to the relationship.   The distance between the camera body joint surface of the first annular portion and the lens joint surface of the second annular portion is 17.5 mm or more and 19.0 mm or less. Mount adapter. The mount adapter joint is
Camera-side fixing for fixing the mount adapter to the camera body by hooking it on the mount claw of the camera body with the camera body joint surface of the first annular portion in contact with the lens mount surface of the camera body Having a member,
The interchangeable lens mount part is
The mount adapter according to claim 1, further comprising a lens-side fixing member that fixes a lens to the lens joint surface of the second annular portion.

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