Light values — calculator dial Reference guide

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         CALCULATOR No. 1
      For Black-and-White and Colour
             Negative Materiels
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Llght Shade, Gloudy Weather and Heavy Shade (ell weathers).
When convenient double the calculated exposure for greater safety.
Slde Lighting and Back Lighting in Clear or Hazy Sun.
Side Lighting-add 2 units to the Light Value.
Back Lighting-add 3 units to the Light Value.
                    Imoortant Note
Calculated exposures should prove satitctory without modification.
fn an emergency they can be halncd with a reasonable chance of
guccess-Dut this is ,tot recommended as a normal practicc.
This is all I have of the book.
                                                                  -/

r     EXPOSURE CI\LCULATOR No. 2
I
         For Black-and-White and Colour                'Reversal                            Materials
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                                             Digitally signed by Mike Butkus Mike                DN: cn=Mike Butkus, o=Butkus
                                 camera manuals, ou=butkus.org,
                                    email=mike@butkus.org, c=US  Butkus             Date: 2021.04.14 21:51:47 -04'00'
                             64                          32 24       t6
                                  ctNE TAKINc SPEEDS (F P 5)
    Slde and Back Llghting. The best exposure for a Side or Back Lit
     Subiect will depend on the pictorial importance of shadow detail and
    must, to some extent, be left to the photographer's iudgement.
     For dramatic lighting effeus-reduce the Light Value by I or 2 units.
    For enhanced shadow dercil-increase the Light Value by I or 2 units.
                        Important Note
    Owing to the limited exposuie latitude of reversal materials the
     calcul-ated exposures must be used witl0ut modification-except
     for slight adiustments which are found necessary in practice to
      suit inilividual equipment or prefercpces,

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   EXPOSURE CALCUIETORS
      Sumblary of Instructions
CALCULATOR No. I-NEGATM
Nearby, Unshaded (Normal), Subiects.
 Set B.S. Exposure Index (greqn figure on
 disc) against the Light Value (black figure in
 outer circle).
Other Subiects. Set the Calculator as above.
Note position of pointer and reset disc until
 the appropriate Subject Sector occupies this
 position.
CALCULATOR No. 2-REVERSAL
Normal Subiect, Front Lit. Set B.S. Ex-
posure Index (green figure on disc) against the
Light Value (black figure in outer circle).
Other Subiects. Set the Calculator as above.
Note position of pointer and reset disc until
the appropriate Subject Sector occupies this
position.
                                     Page
   Instructions                                 t>
   Subject Classification                           .77
   List of B.S. Exposure Indices        70-74
  Light Tables                       85-92
  Use in Artificial Light.   .         .81
  Cinematography                           .80
  Moving Objects                           .16
   Filter Factors                         27
  Note on Exposure Values           80
Lig-ht Values are calculated for the 2Lst day of the month.When wmhin-g in the-early mmning or lai  etjening in tie
early days oJ a month compare the Light Value with.that
g-tr!e1 ry! -the preceding month^at the same time of day.+r.ght.Volues are corrcct at ile hour and usually appily
3O minutes either way-but be careful early anf, taii ;7the day.