BERTRAM CHROLON User manual

Frome speedsond shulter speeds for movies

  Scole of light volues

  Apertures (f-stops)

  Shutter speeds

 '
   Slot of light volue

  Movoble diol for film exposureindex numbers

   Film sensitivity numbers

   Diol

  Cover push button


\'

l. Opening the meter
When button J is pressed,the cover ond the
two  shutters open ond  outomoticolly the                    -staPffio-El ectric-Cell      r-ts functioning.-
                    ll. Film sensitivity


               n                     V


                               A S A


                                      continued p. 5



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Before toking o meter reoding film sensiti-
vity's roting must be set byturningdiol Funtil
the correspondingnumber oppeqrs in the
slot neorest to the film type indicotion.The
obove exomple  shows the meter set for o
film sensitivityof 50 ASA.
  lll. How  lo reqd the light volue scqle
                             -   LightvolueB shown
                    -l I by the pointer
                                  I A
                              of lishtvolue
                         lot




 Point the CHROLONot the subject. The view-
 ing ongle is 500. Then turn diol H until the
numOei oppeoring in the slot E is corres-
 ponding to  the reoding indicoted by  the
 pointer.'speed Now the correct operture ond shutter
       con be reod directly. The exomple
 obove is showing reoding ond setting of 8.
                                        5

lV. Apertures qnd Shutter Speeds





This diogrom demonstrotesthe volues for
o  iitm with 50 ASA  sensitivity ond o  lighr
volue of B os follows:
       Aperture 5,6: Shutterspeed 1/zrsec.
      Aperture 8   : $hutter speed 1/rosec.
       Aperture 11   : Shutterspeed 1/r sec.
lf your comero does not show e.g. opertureB
set your indicotor between 6,3 ond g.
         V. Intermediqte Vqlues
In the event the indicotorpoints in between
two light volues,turn diol H until the dividino
line between some is in the center of th6
slot. Now the correct shutterspeeds con be
reod directly for the following f-stops:4,5-
6


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ASA Exposure Index Volues
      for All Movie Fitm
          16 mm Movie Fitm (Btqck ond White)
                              E xp o su re   . In d e x
                            Do ylig h t  Tu n g ste n
Ans c o   H y p o n R e v e r s i b l e          q i         Z,
         Supreme                  50       32
Kin -O -L u xTV                          6 4       5 0
        G o l d S e o l                           1 2 5
Kodok    Super \[  Ponchromotic    100 .     g0
         S u p e r X P o n c h r o m o t ic      4 0       Zz
           8 mm Movie Fllm (Btqck qnd White)
Ansco    Hypon Rev.               40       32
          T r i p t e S P o n               1 0 0       8 0
Kin-O-Lux TV                       64       50
          No. 3                     64       50
Kodgk    Super X Ponchromotic      40 __-    32
        C i n e K o d o k P o n c h r o mo tic   1 0 '        g
                 .  15 mm Movie Film (Cotor)       $A n s c o   C o l o r D o y l i g h t             1 0        2 , 5 ( r )
        C o l o r T u n g s t e n            1 0 (r)     1 0
Kodok    KodochromeDoylight Type   10        4 (s)
         K o d o c h r o m e T, y p e A         1 0 (r)     1 6
         K o d o c h r o m ec o m m e r cio l     8        1 0
           8 mm Movie Fitm (Color)
Kod o k    K o d o c h r o m eD o y l i g h tTyp e   1 0        4 (r)
         .     K o d o c h r o m e T. y p e A         1 0       1 6
( t) Wit h A n s c o C o n v e r s i o n F i l t e r Nr. 1 0
( ,) Wit h A n s c o C o n v e r s i o n F i l t e r Nr. 1 1
( 3) Wit h K o d o c h r o m eF i t t e r N r . 8 0 fo r Fo to ilo o d (Tu n g st.)
( 4 ) W i t h K o d o k D o y l i g h t F i l t e r N r . 8 5 l o r T y p eA C o t . F i t m
( 5) Wit h p rop e r F i l t e r o s  r e c o m m e n d e d
( 6) Wit h K odo k D o y l i g h t F i l t e r N r . 8 5 B lo r Typ e B Co l. Fitm



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6,3-9 etc. -  The diophrogm seriol 4-5,6-8
etc. requires intermediote settings on your
comero.
            Vl. Movie ExPosures
The exposure times indicoted inside the
cover ore those requiredfor o normolshutter
opening of 1800.For exomple,the exposure
tihre oi one picture ot the rote of 16 f romes
per second is 1/acsec. The proper operture
ot ony film speed con be found by using the
shutterspeed of o single picture in setting
the scole of exposure speeds (os shows
por. lll) ond then reoding the {-stop wltic!
bppeors opposite it. The normol speed oI 16
trbmes is lnoicoted with the sQh r
         Vlll. Generol Observotions
This hondy precision exposure meter will
solve ony problem in block ond white ond
colour photogrcphy,ond will olwoys guoron-
 tee you the verY best results..
A corrying choin will be found most con-
 venient f or one-hond operotion.As, however,
 photogrophicwork sometimesdemonds the
 photogrcpher's both honds, the meter con
 blso Oe mounted on o wrist strop to which
 it is ottoched by meons of o boyonet litting.
 Neck strings,lopel choins or leother coses
                                                                                                                                                                  f

M




ore olso ovoiloble on request ot every good
pirorogrophicstore.                                          ,
The BERTRAMCHROLONis equipped with o
first closs jewel-mountedmeosurinqsystem.
Although  ii is shock-proofro o  re'moikoble
degree, coreless treotment con domoge the
instrument. In such coses o  good  photo-
grophic deoler should be consulted.He will
usuollybe oble to orronge for repoir, or in
extreme coses/ return the meter  to  the
monufocturers.                                                                        ,
           Ernst & Wilhelm Bertram
                 MUnchen-Posing
                       Nr. 4Io A5A            I
               P r i n t                       e d i n
                    G e r mo n y              f                                \                        www.butkus.us