Stereax Stereo attachment User manual

Directionsfor usingthe StereaxAttachment.

    Attachment    to Camera  Lens.
       The Stereax  is attached to the front  of the lens by mearts of      'Kodak'    a         Lens Attachment,  available in  different  sizes to  suit
     different makes of lenses. The back of the Stereax has a series of                                                                                                                                                                          '                      '    three depressionswhich are of the prop er slze to  fit  the  Kodak
    Lens Attachments  in the sizes 320,'370,and 420. Fcr use, unscrew
    the Attachmerrt from the retaining ring and position the latter in
    the proper depression on the back of the Stereax by means of the
    four little rcrew. and washers, which will  just overlap the eflges of
    the metal ring.  The Attachment  is then screwed on to the retainirrg
     ring and the entire assembly is ready to be placed on the camera.
    The retaining  ring should be  left on the Stereax and the Attach-
    ment can be unscrewed so that a filter can be placed in position
   when desired.
     Position.
       The Stereax must  sit squarely c>nthe camera lens.
     View-finder.
       The Stereax  is provided with  a reflepting  type  built-in view-
     finder which shows  its  fi'eld of view.   tJse this  finder   if yours
    happens to be one of the few cameras in which the regular finder is
    covered when the Stereax  is placed on .the lens.   If your camera
    has an optical eye-level view-finder,  it  is necessary to mask this
     finder to make  it include the same view as seen by the Stereax.
    Each Stereax  picture measures 18 x 24n'tm.,i.e., half the normal
     size. This masking is conveniently done by means of two narrow
     strips of transparent tape on each side of the front  of the view-
     finder.  The central part will then be square instead of oblong and
    should correspond with  the view observed in the Stereax  finder.
    The cellulose tape, being transparent, can be left on the finder as it
      will not interfere with taking pictures without  the Stereax.
    Exposure.
       The exposure shoutd be increased bv 50iL  (* stop) when black
    and white film is used.  For colour film, a full stop larger should be
    taken. A good plan is to use a film as a test roll and make a series
     of different exposures of a single subject.  The correct speed of the
      film, when used with the Stereax,  will  then be easily determined.r
        Follow the usual routine of taking pictures, but remember that
    good stereoscopic pictures  should be sharp  in  all planes.  use
     therefore a depth of focus table rn'heneverpossible.  Always include
    some foreground in your composition.
                                                                      p.T.o.

Optical  Data.
       The Stereax has been designed to 6iive satisfactory results with
    rnost 35mm. and other  small cameras, providing  the  lens  is of
    normal focal length.  Wide-angle  or  telephoto  lenses cannot be
    used. On some 1a*"t"s   (Baniarn Special, Retina, ,Weltini)  the
    Stereax  cannot be used as it  is impossible to  fit  the instrument
    close enough to the lens. On all 35mm. double frame (24 x 36mm.)
    cameras the lenses should be of 50mm. focus apd. the maximum
    aperture not greatet than F12.            *r:..-i!ri.''?i'i:'
              It  is important  that proper lens iplit,tt"s   be used. With  a
   50mm. lens, ihe best srops-areFl5.6,F/6.3,                                       and Fi8. _Wider openings                                              -6f    cause an undesirable overlapping     rhe' t'Wo adjacent pictures.
    Smaller openings <io not give proper coverage.
        With  a 3" lens, no stops larger than F/8 should !e us-ed._ T,enses
    with  still longer focal length  (for use with  correspondingly larger
     film size) sholld be stopped do*n  to F/11 or smaller,
       The Stereax  should always be mounted as close to the lcns as
    possible; otherwise insufficient coverage of the cbrners may result.
    Viewing
       The transparencies obtained with  the Stereax  can be viewed
    by means of the Sterolist  Viewer.   They can also be. projected  in
-**thr"e  .dimensignqby ulgrg thg:gw  ,lt_elgtJ.x -r_lg.,njyn:rl:l:ir!
    an ordinary film-strip Pro;ector.
    Care  of  Instrument.
       The Stereax  is a fine optical instrument and should be treated
    as such. The re{lecting s,ttfac"s are optically flat glass cqa-tgdwith
    pure aluminium.  Loose dust may be removed by careful blcwing.
     F'ot -ot"   thorough  cleaning, rub  surfaces gently  with  a  tuft  of
    clean cotton.  Do not touch the mirrors with the firrgers.
       The Stereax  (Regd.) is made bv A.P.I.  Ltd., and distributed
    bv r-

               PTIOTAX  (London)  LIMITED
                        7A, Charlotte  Street,
                   LONDON,  W.1.
                          LANgham 6272.



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