BEWI Automat A light meter User manual

Film Speed Window     o
                        Operoting K"y     o
                        IntermedioteAperture Scole     o

                        Aperture Scole     @

                          Light volue     o
                      ExposureTime     o
                       Knurled setting screw for film speed     owww.orphancameras.com

Film Speeds:
These qre found in the three smoll gold tropeze shoped windows        E x o m p l e :
obove the symbols ASA DIN WES. The oppropriote film speed
con be set eosily with  the  tip  of  the finger, by turning the
knurled screw (Z). Core should be token thot the setting is exoct
o n d   t h o t  t h e  f i l m  s p e e d v o l u e s o r e  c o m p l e t e l y v i s i b l e  i n   t h e
c e n t r e o f   t h e w i n d o w .   l f o 1 7/ 1 0 D I N   f i l m   i s b e i n g u s e d , t h e
grou p 17-1?/10 DIN should be set on the BEWI AUTOMAT-A. The
step from one group  to the next corresponds to the step from
one operture to the next; for exomple: -
                D I N     D I N
                  17-1o110  20-22/10
Aperture              8                     l l
For block ond white films this grouping of three volues is quite
odequote. A group of three corresponds to-q chonge from one
lens operture to the next, or  to q doubling or holving of the
exposure time.  lt  is possible to work  with  single film speed
steps by  using  the  intermediote operture  scole. Over  eoch
operture figure on the BEWI AUTOMAT-A there ore three smoll
squores.Where, for instoncethe group
                         17-]|9/10DIN
is concerned,the squores ore equivolent to:
 l e f t * * 7 7 , m i d d l e -    . | 8 , r i g h t -     l 9 l 1 0 D l N .
6                           www.orphancameras.com

Cine Photogrophy:
words. This eliminotes the glore from  the sky ond  the BEWI
AUTOMAT-A gives the correct reoding  for fhe foreground, which        The BEWI AUTOMAT-A  is equolly  efficient for movie shots. A red
 is fhe mosf imporfont port of the subiecf. Neither direct light nor        mork  will  be found on the exposure scole between 1/er sec. ond
brilliont  reflected light should be ollowed  fo  foll  directly on          1/sosec. This  is the cine mork  for  the normol c.omero speed of
lhe honeycomb lens os the resultont exposure times will be too            l6 fromes per second or for on exposure time of 1/sosecond.shorf.
                                                                The operture con be reod off directly over the cine mork.
Meosuring Incident Lighf or Light Folling on the Subiect:              The setting for other comero speeds is os follows:  -
For  this purpose  th.e. diffusing cover which  is ottoched  to  the
corrytng chotn should be ottoched to lhe honeycomb lens.                             8 fromes per second  :   r/15 second
The diffusing cover increoses the occeptonce ongle  of the BEWI                     15 fromes per second  :   1/ro second
AUTOMAT-A             so                   thot                                        it                         coveri                                 not o  limited                                            oreo                                                     but the                                                      whole                                                                                32 fromes per second  :   1/oo secondspoce in fronf                 of                  the                     mefer.                         Reodings                                    should                                         be token                                                    from                                                              fhe
subiecf position towords the comero, thus the light folling on the                     64 fromes per second  :    tf::,s second
subiect is meosured, ond  the reflectonce of  tfie subjeci is not
token into occount.                                                     Colour Shols:
When photogrophing by  ortificiol  light, porficulorly with colour        The  cell  of  the BEWI AUTOMAT-A  is sensifive to  light  of  ollfilm,  this  method  gives  good  results. The BEWIAUTOMAT-A     i    colours ond will give correct exposure reodings for colour film.
regisfers          fhe            mixed  light                               of  lhe                                room,                                    ond                                                   refleclions                                                                or  dork     l'+   As  different monufocturers use different methods  of  meosuringbockgrounds            behind                     the subiect                             do                                     not                                         influence                                                   the result.
                                                                           the film speed of  colour moteriol lhe comporotive volues oreWith speciolly dork obiects, or objects with strong shodows, the
exposure time should be doubled.                                     given in DlN.
1 2                                                                                                                                                                                                                                                                                                                                          l 3
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