Pentax 6x7 extension tube User manual

SPECIFICATIONS

  Auto ExtensionTubes (lnner Bayonet)                                                                                                                                                                    i
   Camera:     Asahi Pentax 6 x 7
    Lenses:    6 x 7 interchangeable lenses from 55mm  to 300mm
    Length:         f 1-14mm  (0.55 in.)  fi2-28mm  (1.10 in.)  #3-56mm  (2.2tin.)                          {
    Weight:     #l-75e  Q.65 oz.)    fi2-90g  (S.LToz)     #tzls  (4.4I oz.)
   The 6X7  Auto  Extension  Tube  is designed for  use with  Takumar/ixZ     inter-
   changeable lenses from 55mm to 300mm.  The Auto  Extension Tubes can be used
    individually  or in any combination,  utilizing  the fully  automatic diaphragm  of the
   lenses. For close-up data on each lens, refer to Tables 1-6  (pages 4-  9).


  ExtensionTubes (Outer Bayonet)
   Camera:    Asahi Pentax 6X7
    Lenses:    6 x 7 interchangeable  lenses from 400mm  to 1000mm
   Length:    A-23mm   (0.91 in.)  B-46mm  (1.81 in.)
   Weight:    A-1109  (3.88 oz.)   B-150g  (5.29 oz.)
   Extension Tubes A and B are for Takumar/6x7   lenses from 400mm to L000mm.
   For close-up data on each lens, refer to Tables T-9   (Pages 11-13).


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Assembly                                 Disassembly
Align the red dot on the Auto Extension         When detaching the lens from the tube,
Tube with that on the body mount and           press the bayonet locking  pin on the
turn the tube clockwise until  it automa-           tube and turn the lens counter-clockwise
tically locks. Make sure that the tube is              until  the red dot on the lens matches
completely locked.                                    that on the tube.





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HOWTO USETHE GLOSE.UPTABLESr y                                       &           # r . f f r o


      Depending on your  particular close-up situation, determine  first  1) the picture area, 2) the
       film-to-subject distance, or  3) the magnification.  Then  select the most  suitable Extension
     Tube combination according to the data in the tables.
    Determine the magnification  first                                                                                        t
     When  you want  to magnify  or reduce a subject to a specific image  size, determine  the
      magnification  first.  For  example,  if  the image  size is  half  the  size  of  the  subject, the
      magnification  is 0.5.   If  the image  is twice as large as the actual subject, the magnifica-                       ,
       tion  is 2.  The  close-up table will show which  Extension Tube combination  to use.                                          ',.
    Determine the picture area first
     When  the subject area to photograph  is determined, measure  its length and width.  Then
       refer  to the  picture area column  in  the close-up table and select the most  suitable lens
      plus Extension Tube  combination.
    Determine the film-to-subject distance first
     When   it is difficult  to get closer to your  subject, determine the desired film-to-subject dis-
      tance first.  As the picture area varies with  the focal length  of each lens, select the most
       suitable lens plus Extension Tube  combination by referring to the data in the close-up table.
    Exposure Factor
       In close-up photography, you must adjust the exposure according to the length of the Exten-            c
      sion Tube, as the amount of light decreases as it passes through a greater distance. Exposure
       varies according to the combination of lens and Extension Tubes.  Refer to the data in the
      close-up table for  the exposure  factor  that shows how much  to compensate for  correct
      exposure. No exposure factor compensation is needed when  the exposure reading  is made
       with  the 6X7 TTL  Pentaprism which  will be available in the near future.                            ,&





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Assembly                                Disassembly
Place the tightening  ring of the Exten-        When  detaching the lens or Extension
sion Tube on the outer bayonet of the         Tubes from the camera body, follow the
camera body.  Then  turn  the tighten-          reverse order  of assembly.  Either  the
ing  ring  counter-clockwise, as shown.           tightening  ring on the Extension Tube
Make sure that the bayonets are com-           or the lens may be loosened. Be suse
pletely engaged.                                      to hold the camera body  firmly.





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F o l din g Fo cu sin g Hood                Rigid Magnifying  Hood

     The Folding Focusing Hood, for waist-    This  waist-level rigid viewfinder has an
       level viewing,  is used when  the pen-    adjustable 1.3 X  magnifier  for  critical
      taprism  is detached.  This  four-sided    focusing   It is completely light-tight and
      focusing hood  is equipped with a 1.6 X      is equipped with an adjustable eyepiece.
      focusing  magnifier  for more  accurate   As  with  the Folding  Focusing Hood,
      focusing.                          L00% of the picture area can be seen.

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Gable Release   ll and Long Gable
Magn if ier                            Release
                                 When  shooting at slow shutter speeds
This  is a 2 x magnifier for super-critical     or when taking close-upsor macropho-
focusing.   It is designed for magnifying     tography, the cable release is a neces-
the central  portion  of the viewfinder.     sary accessory. Both the Pentax Cable
Hinge  at top  allows the magnifier  to     Release II and the Long Cable Release
be lifted  for  full  viewing  through  the    have special locking  collars for making
viewfinder.                                 time exposures.

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