BEWI Electro Type 56 User manual

Pointer scole (block figures on white ground)o
         Knurled setting knob for pointer figures

           setting..scole for pointer figures (block figures on whire         ground)

         Apertures (block figures on gold ground)

        Exposure times (block figures on white ground)

        Movie cqmero fromes per second (whire figures on block        ground)

         Setting knob for film speeds

          Shutter-light vqlue (red figures on white ground)

         Film speeds in DIN - ASA (block figures on gold ground)@ooooooo                                            3

INSTRUCTTONStN BRIEF"
 l. How to Set the Film Speed.
set the fifnr speed Rumberin score window (9) by
meonsof settingknob (T)"
2. How to Sef the Scqle.
Accordingto prevoifing Iightconditionsthe pointerwill
come to rest on o figure in scole(l).By meonsof the
forge knurled setting knob (2) the hg.rru which is in-
dicoted by the poinrer(ol"en intermediotereoding)is
sef in scole(3).
3. How to Toke o Reoding.
It is now possibleto reod off ogoinstthe operture(4)
the correct exposuretime (5), or well os the movie
speed(6).At the some time the shu Iterll ight vo lue con
be reod off in scofe window (g).

Whqt is the Significqnceof the Figureson the
  ETECTROBEWI,oh the film ond on the ctlmerq?
   l . F i l m S p e e d .
 T l re s p e e d o f p h o t o grophic motgtiob is gxpressedi n   t e r m s o f
  s t o n d o rd s,f o r e xq mp le DIN or ASA. Tlre relevontnum b e r i s o f t e n
                                   s h o w n o n   t h e   f i l m  c o r t o n . T h e s l o w e r
                                                               f i l m s  h o v e     l o w e r  n u m b e i ' s o n d    t h e
                                                               f o s t e r  f i l m s h i g h e r n u m b e r s .
                             T h e E L E C T R O B E W I  c q n  b e  s e t   f o r
                                o n y  d e g r e e o f  s p e e d  f o r  st                     D tN 10-32/10" ASA B-t 250,,
 I(t'
                             2. Ap"rlure =   f
   I n o r d e r t o b e o b l e t o r e g ul o t e t h e o m o u n t
 o f    l i gh t                   t h ro ug.h.the      every                   . p o ssin g              !gnt c o m e r o  i s e q u i p p e d w i t h o  d i o p h r o g m ,                        A/il[   t l re op e n in g o f wh ich =  operture
 con be increosed or reduced by  g iven
  " s t o p s ' . Th e se st o p s ore shown os num-
, b e r s o n  t h e  l e n s m o u n t q n d w i l l o l s o b e
   f ou nd on   t h e o p e rt ure scole  (4) of  the
 E LE C TROB E WI crs f o llows:                        Atil

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f i l m s p e e d s .
5. Depth of Field.
The ELECTROBEWI gives o number of operture/exposuretime
combinotions which o-re correct for given light-theseconditigls, cnd
t h" c orre sp o n d in glig ht volue. Every.gne of        c o m b i n o t i o n s                                     fgrves o correct d*po1ure. Whot combinotion to choose depends
5n the type of comero shutter,.i. e. whot _gpertureond exposure
t i me n u mb e rsit b e o rs, qnd on the subiect.Tl'rismight b e  i n m o t i o n
o r req u ire sp e cio l d e p th of field.                                     ID ep t h o f   f ie ld me o n s the distonce or ronge. witni l w h i c h  t h e
n e o re s to n d  t h e mo st distont obiects ore cletrly defi n e d , o n d   i s
governed by the focol length of the comero lens.
F or on y g ive n le n s, t h e smoller the operture.the greot e r t h e . d e p t h            "t h o u g h                                t h a e x posuretime must be increosedo c c o r d i n g l y .o f  f i e l d,
B
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6, Movie Comero Speeds.
    T h e us er of o mo t e u r cin e comeroscon, with the oid of  t h e E L E C -
    T R O BE W I , o sce rt o in o f o glonce the correct operture ( o t   i n t e r -
    mediote operture setting) foi every comero speed - Scole (.61.
I   He re t oo ih e p o in t e r f ig ure in scole (I) is set in wind. o * ( 3 ) b y
     o p e ro t i n g kn u iie d kn o b -(2). The correct opgrture for th e c h o s e n
    comero ipeed con then be reod off scole (4).
    T h e e x o m p l e i l l u s t r o t e d w,  i t h t h e p o i n t e r o n 1 0 o n d o  f i l m s p e e d
     o f   l B / l0 D I N s h o w s t h e f o l l o w i n g v o l u e s :
     Aperture                 2     2,8      1     5,6      8
    E"posure  ti me         250    125     60     30     15
    Frcrmesper sec"       128    64     32     16     B
      7. Meqsuring the lighting witlr the ETECTROBEWI





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W h e n o  r e o d i n g i. . s . t o k e nt h , g . p o i n t ewr  i l l s e t  i t s e l f , o c c o r d i n gt o
 t h e p r e v o ii.nl g , f i g l r t i n gc g n d i t i o n s ,o n o n u m b e r i n  t . o l u  t t t ] g y
m e o n so f k n u r l e d k n o b ( 2 1t h i s n u m b e r ,o r  t h e  i n t e r m e d i o t ei e o d -
 !l g ,   i s  t r o n sf e rre dt o scole. (3). This completes the who l e o p e r q -
 t i o n , e T p o - s u rt ei m e o n d  r e l e v o n to p e r t u r e o r  t h e  l i g h t v o l u e c o n
be recd off ond tronsferredto tlre setting of the corneroshutter.
Ago i ns t o p e rt u re sco le (fl with operture numbers 1,5 - 2 2 ( b l o c k
n u m b e r so n g o l d g r o u n d ) c o n b e  r e o d  t h e e x p o s u r e t i m e s ( 5 )
 ( b l o c k             . f i . g u r e so n  * h i i e  g r g y n d ) . A u t o m o t i c o l l y ' t h es h u t t e r / t i g n i
v ol ue (8 ) (re d f ig u re l_ gn_white ground) is set ot the s o m e t i " m e
o v e r  t h e w o r d  " E L E C T R O " A.      l i \g h t  r e o d i n g w i t h  t h e E L E C T R C
B E W I i s  t h u s e x t r e m e l ys i m p t e .

B. Colour Photogrophy
G r e o t c o r e m u s t b e t o k e n w h e n e x p o s i n gc o l o u r f i l m . T h e E L E C T R O
BEWI o s su re sco rre ct e x posure time f6r colour shots . H o * u u " i ,
the  t y , peo f  f ilm, d e ve lopment,correct functioning of   t h e s h u t t e i
o r e o l s o  it p o rt o n t   f o ct ors. We recommendthot Jhree  t e s t s h o t s
b e m o d e o f   t h e so me s ubi".L.._O_neshould be occord i n g t o  t h ee x p o s u r et i m e g i v e n                                        . Q y  t h e E L E C T R OB E W I , o n e w i t h o    l o r g e r
9P_eltJJqqld  one with o smoller operture thon shown by tne
ELE C T R OB E WI . lf  t h e resultsshow the necessityof o c o r t e c t i o r r
t h i s c o n b e - d o n e b y  c h o n g i n g t h e  f i l m s p e e d s e t t i n g o n   t h e
E L E C T R OB E W I .
r0

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F i l m s p e e d sf o r c o l o u r f i l m o r e b o s e d o n  t h e s o m e s t o n d o r d sq s
t h o s e u s e d f o r b l o c k & w h i t e  f i l m o n d w h e n o p p l i e d t o c o l o u r
f i l m  t h e s e o r e o n l y o p p r o x i m o t ev o l u e s . l t   i s  t h e r e f o r eo f o d v o n -
t o g e t o s t i c kt o o n e m o k e o f c o l o u r f i l m .  l t  i s  i r p o r t o n t  i n m o k i n g
c o l o u r s h o t s t h o t t h e g e n e r q l i l l u m i n o t i o ni s w e l l d i s t r i b u t e do v e r
t h e w h o l e s u b i e c t .S h o r t e x p o s u r e sr e s u l t i n d u l l c o l o u r so n d d o r k
t r o n s p o r e n c i e sO. v e r - e x p o s u r ree s u l t si n p o l e o n d  i n s i p i d c o l o u r s .
R e o d i n g ss h o u l d b e  t o k e n c l o s e t o  t h e s u b i e c t ,s p e c i o l l y w h e r e
tlrere q re sh o d o ws o n d controstsbecouse loterql ligh t c o n c o u s e
o   f o l s e r e o d i n g .


9. Meqsuring Light Reflected by the Subiecl.
O n e s h o u l d n o t o i m  t h e E L E C T R O
B E W I v o g u e l y  t o  o b t oi n  o    l i g h t
r e odi ng . He re t o o ce rt oin ru les must
b e o b s erve d . O n e sh o uld stond in
the po s i t io n f ro m wh ich the picture
w i l l b e  l o k e n , o i m i n g t h e e x p o s u r e
m e t er qt  t h e o b ie ct , t h u s meosuring
the  l i gh t wh ich is re f le cied by thot
o b i e c t . T o e n q b le o n e t o get o true
r e o d i n g   t h e  E L E C T R O B E W I     i s
e q u i p p e d w i t h o  h o n e y c o m b  l e n s
                                                                                                                                                        l l

be token thot not too much
                                         light  enters the  e x p o s u r e
                                meter from the s k y , b e c o u s e
t h i s w o u l d g . i v e . o f o l s e r e o d i n g . T h e E L E C T R OB E W i ' i n o u a b ;
q i t gd . s l i g h t ly d o . wn words,or llse   it shoild-b"  sCt . * - d U T r ; ;
    b r i g h t s k y w i t h t h e h o n d  i n  t h e s o m e w o y o s o n e u s e s q   l e n sI h "h o od on o come ro .





1 ?

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10. Meosuring Incident Light.
                         l1,h#A7        Meosuring   incide n r      t i g h t                                    ilfrlfl'rJji,o':;nn,n"tnl,o,i"                             This  is the exoct opposite to
                                  the  method prev i o u s l y d i s -
                                    --'re   il;:"t"l!",'ni;ffnn'J"'il
                                         th; d iff usrng screen, supplied                                     -l]t
                                   with   the  ELECTRO BEWt,
                             should  be  ploced o v e r   t h e
                                  p h o t o - c e l ll.t q e q u i r e os n l y l i g h t
                               pressure to  fix  it   i n p o s i t i o n
                                over the  lig ht sh o f t o f    t h e
                                meter. When using  t h i s d i f -
                                                                    f u s i n g s c r e e nt h e  l i g h t n o  l o n -
gn.sleonlhuphoto-cen,whichis ,"-?;;.1?il',,l'n";#"Jlr,?;l'if;:l i g h l c o m i n g f r o m  t h e o b i e c t , b u t  f l o d d s i n  f r o m q l l s i d e s o t o n
o n gl e of  1 B 0 o in t o  t h e photo-cell. The onswer obtq i n e d * n " "
to k i ? . q.o re q d in g .in  t h is yoy reflectsthe strengthof th e  i i g h t i n g
conditions. R"gdings con b€i tqken from the sJUiect toworis tnE
9 . ome l o,b u t wh e n e ve rt his is not possible,from'the to k i n g p o s i -ti on . (go me rop o sit io n ).The exposuremeter should nev e r b " e 'h e l d            ,t:Hf
st rq i g. f tt o wo rd s t h e su n or other.l.i.ghtsgqrce,but sho u l d m e r e l y
b e o l l o w e d  t o  r e c o r d t h e p r e v o i l i n g l i g h t i n g c o n d i t i o n s . l t    i ;
                                                                                                            I 3

T h e o b o v e h i n t s b y n o m e q n s e x h o u s t t h e p o s s i b i l i t i e so f   t h e
E L E C T R OB E W I o s o n   i n s t r u m e n tf o r   l i g h t m e o s u r e m e n tA.     l o t
m ore k n o wle d g ewi I I b e go ined by experience.
T h e e x po su re me t e r E L E C TROBEWI is cr precision instr u m e n ti u s t
l i k e o w o t c h . l t c o n t q i n st h e m i n u t e s ts p r i n g so n d t i n y s p i n d l e si n
ie w e l l e d be q rin g s. Th e ELECTROBEWI will o lwoys re s p o n d t o
g o o C t re o t n re n t A. s o p ro tectionfor this instrumentwe re c o m m e n d
th e us e o f  it s co lf le o t h er cose with zipp fqstener.

Correcting the Zero Posilion.
Sho u l d i t b e  f o u n d o f t e r some yeqrs of use thot the p o i n t e r n o
lo n ge r c o me s t o re st e xo ctly in the zero position when th e p h o t o -
ce l l (h o n e y co mb le n s) is covered, it is possible to mok e o n o d -
iu s t me n t b y me o n s o f o n odiusting screw on the bq c k o f   t h e
E L E C T R OB E W I r i g h t u n d e r t h e w o r d s , , M o d e  i n W . G e r m o n y " .
A n y d e o l e r w i l l b e h o p p y t o d o  t h i s o d j u s t m e n ti n h i s d q r k r o o m .





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