Pentax 6x7 lens adaptor User manual

iFunction         and Features
 The 6 x 7 Lens Adaptor K is designed to allow       An Example of Change in Angle of View
 the mounting of Takumar 6 x 7 lenses on the          The angle of view of the Takumar 6 x 7 200mm
 Pentax K2, KX or KM 35mm SLR's. Even with           lens is 26" tor 6 x 7cm format. but it becomes
 this adaptor,  f ocusing is possible from the              12" when it is mounted on the 35mm Penrax
 closest distance to infinity.                             camera, the same as the regular 200mm lens
 One end of the 6 x 7 Lens Adaptor K has a               for the 35mm Pentax.
 dual bayonet mount similar to that on the
 Pentax 6 x 7 camera. Lenses longer than 400mm
 in focal length are mounted on the external
 bavonet mount; lenses shorter than 300mm in
 focal length are mounted in the internal bayonet
 mount of this dual mount. The other end of the
adaptor was a bayonet mount similar to that of
 an SMC Pentax lens. The adaptor has a thickness
 of 39.5mm to  f ill the difference in  f lange  f ocal
 distance between the Pentax 6 x 7 (B5mm) and
 the Pentax K2, KX or KM (45.5mm)
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fficcerrn rnonded Lens#$                           The 150mm 6 x 7 lens in fact has a speed of
Among the lenses for the Pentax 6 x 7 camera,           tl2.B, one f-stop faster than the SMC Pentax
the 400mm (Fig.2)  , 600mm and B00mm lenses       150mm f/4 lens.
are very useful for Pentax 35mm cameras
                                                                                                                                                              f,S mt" [:{eufi rn mendedbecause they have a fast speed of tl4 - faster             Lentsms
than any SMC Pentax ultra-telephoto  lenses.          The 35mm Fisheye lens for the Pentax 6 x 7
                                                camera becomes a high-distortion wide-angle
                                                              lens on the 35mm Pentax. The 55mm f/3.5
                                                and 75mm t14.5 wide-angle lenses become
                                                      standard or long-focus lenses on the 35mm
                                                       Pentax. The built-in leaf shutter of the Takumar
                                             6 x 7 90mm  f l2.B makes  it impossible to use
                                                                this lens on the 35mm Penta4*.,

How To Mount and Detach
     Lenses Mounted In lnternal Bayonet Mount
     (Lenses Shorter Than 300mm in Focal Length)
    As shown in Fig. 3, mount the 6 x 7 Lens
                                                                                                                                                                                                                                                                         'l     Adaptor K on the Pentax K2, KX or KM camera
      just as you would a regular SMC Pentax lens.                                          il
    Check to make sure that the red dot (1) is at
     the top and the clamp screw (2) is on the left                                                        I
      side. Detaching the adaptor from the camera is                                    )
      similar to detaching an SMC Pentax lens.
    As shown in Fig.4, match the red dot (3) on the
    adaptorwith the red dot (4) the Takumar 6 x 7
      lens and give the lens a 60" turn clockwise. (Do
     not confuse the red dot (3) with the red dot (1)
     above.) To detach the lens, push the unlock
     button (5) on the adaptorand turn the lens
www.butkus.uscou nterclockwise.

To switch easily between vertical and horizontal
positioning, loosen the clamp screw (2) in Fig. 3
and turn the camera. You will  f ind click-stops
every 90". After positioning, never forget to
tighten the clamp screw.

[-*:nses fl/lounteei CIn Fxternal Bayonet Mounf
(Lenses Longer Than 400mm in Focal Length)

As shown in Fig. 5, these lenses have a tripod
mount (6). Set the lens on a sturdy tripod
f  i rst.
Attach the Adaptor K for 6 x 7 Lens on the
camera as shown in Fig. 3.
Turn the breech lock ring (7) on the Takumar
6 x 7 lens counterclockwise so as to set the
white dot (B) at the top as shown in Fig. 6.

As shown in Fig. 7, match the red dot (1) on
               the Adaptor K with the white dot (B) on the
               breech-lock ring.
            As shown in Fig. B, hold the camera with your
                 right hand and turn the breech lock lock ring
                  (7) clockwise until it is tight. Do not take your
                 right hand off the camera until the breech lock
                ring is secured.





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                                                                                                                                                                                                                                                                                                                                                                                                 i        Ex,g_cqurelFocqsing
By using the 6 x 7 Lens Adaptor K, the
automatic diaphragm and full-aperture
metering functions of Takumar 6 x 7 lenses
are eliminated. Set the preview lever (9) of the
 lens at "Auto" position for focusing and then
set the lever (9) at "Man " position for stopped-
down aperture metering.
When using a 6 x 7 lens longer than 400mm in
focal length which has a click-stop aperture,
open the aperture fully for focusing and then
stop down the aperture to your desired value.