Weston Sangamo Ratings User manual

ADDITIONAL COPIES OF THIS
       LIST ONE  SHILLING  EACH

        fo  the  best  of  our  knowledge,  the
       informotion  contoined in  this  booklet
         is correct.  However, we connot be held
      responsibrefor ony chonges,errors or
                   omrsstons.



 SANGAMO WESTON LIMITED
     Enfield, Middlesex, England
           TelephoncEnfield3434(6 lines)
                      Enlield12,12(6 lines)
        TelegrophicAddrcssSANWESTENFIELD

                Scottish  Factory
         Port  Glasgow,  Renfrewshire
           TelephoncPort Glasgow41151

                  Bronches ot
London   Glasgow  . Manchester  . Newcastle-on-
Tyne    Leeds    Liverpool    Wolverhampton
     Nottingham    Bristol   Southampton

Printed in England                    D.W./lSm./Octwww.orphancameras.com59

FOR WESTON  MASTER   III UNIVERSAL
        WESTON  RATINGS                            A N D  A L L C I N E M O D E L S
  Correct exposure depends upon two  variables:          use the ratings as given on the following Pages.
(1) the available light and (2)  its effect on the                          lf the film you are using is not shown, use the
film in use.                                                 B.S,or A.S.A.'arithmetical index recommended by
 WESTON have always considered these two  to             the manufacturer. Or-cin6  models only-if  the
be of equal importance and therefore introduced            required value does not aPPear on the calculator
their own system of film  ratings. Subsequently              diai, use of the next lower rating is recommended.
this system was found to be so successful that   it
was widely accepted in photographic circles and
formed  the  basis  for   internationally  agreed        FOR WESTON   MASTER    II  UNIVERSAL
standards.                                  AND FOR EARLIER UNIVERSAL  MODELS
  Although primarily written  for owners of the
latest WESTON MASTER  lll  exPosure meter,           use the  next  lower  rating on  your  meter  in
this  bool<let can be used with   all  tyPes  of            preference to the one shown in this booklet.
WESTON meter.                                                                                  lf the film you are using is not shown, use the
                                                           next lower raiing to the B.S.or A.S.A' arithmetical
                                                          index recommended by the manufacturer.
                                                           For example, if this booklet shows a WESTON
                                              RATING  of 200 you shoutd set your meter  to
  Our  laboratories are continually engaged on            160. Alternatively,  if the film  is not shown but
rating new and existing emulsions using a con-            the B.S. or A.S.A. arithmetical index is given as
ventional M.Q. developer for  roll and sheet film           64 your meter should be set to 50.
and plates, and M.Q.-Borax for  35 mm. stock.
However, there  will obviously be changes and           When  using a particular type  of film for the
additions  occurring  after  publication  of  this                first  time,   it- is advisable to  confirm  that  the
bool<let and when  in doubt the B.S. or A.S.A.             correct    \ /eston  Rating has been used  before
arithmetical index  will  serve as a convenient           exposing a large quantity. Equipment errors can
starting  point    if  used  with  developers  as           lead to-undeior   over exPosure and the  listed
indicated above.                                     Weston Rating should be lowered  if results are
                                                       under exposed or raised if over exposed.
  For photoflood lamps use tungsten values.

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D I E N A C H W E S T O } I                                       RAPIDITfD'EMULSiONWESTOII  GEMESSENEFITMEMPFINDTICHKEII
F U R D E N w E s r o N  M A S T E R   t t l           PU ON UI VRE R SMEOLD EEL TE T OWUESS T OMNO D EML AE SS T EPRO U tRI IU N I V E R S A L . B E L I HC T U N G S ME S S E R
     U ND ALLE KI N O.MODELLE                                F I L M C I N E
tlan   benritze  die  auf  den  folgenden  Seiten            Employer les chiffres de  rapidit6 d'6mulsion
angefiihrten Werte.                                    donn6s aux pagessuivantes.
   lst  der  verwendete  Film  hingegen  nicht                Si la pellicule que vous employez n'y figure
angefi.ihrt,dann beniitze man die B.S. oder A.S.A.            pas, appliquer I'indice B.S. ou A.S.A. recommand6
Tabelle, die vom Hersteller empfohlen wird.                   par le fabricant.
  Wenn bei Kino-Modellen die B.S. oder A.S.A.           Ou  bien-sur  les modeles Cin6 seulement-
Werte auf der Einstell-Skalanicht angefiihrt sind,            lorsque les valeurs requises ne figurent pas sur
dann verwende man den nichstliegenden Wert.                le cadran du calculateur, il est recommand6 de
Bei  Verwendung  von   Farbfilmen  wird   der            prendre  le  chiffre inf6rieur  le  plus rapproch6.
.niichstkleinereWert empfoh len.
                                                  P O U R  L E M O D E L E W E S T O N  M A S T E R   I I
rU n DEN wEsTo N MAsTER II U ND          E T   L E S  M O D E L E S   T Y P E  U N I V E R S E L
   FRUHEREU NIVERSAL-MODELLE                        A N T E R T E U R S
  Man beniitze eher den niichstkleineren Wert             Employer  le  chiffre de  rapidit6 d'6mulsion
auf seinem Belichtungsmesserals den in diesem             inf6rieur suivant indiqu6 sur votre posemdtre,de
Biichlein angegebenen.                                    pr6f6rence ir celui qui figure dans cette brochure.
   lst  der  verwendete  Film  hingegen  nicht                Si la pellicule que vous employez n'y figure pas,
angefiihrt, dann beniitze man in Bezug auf den            appliquer le chiffre de rapidit6 suivant inf6rieur i
vom  Hersteller empfohlenen B.S. oder A.S.A.              I'indiceB.S.ou A.S.A. recommand6par le fabricant.
Wert den nichstl<leineren.                                 Lorsqu'on  emploie  un  type  de   pellicule
Bei der erstmaligen Verwendung eines bestimmten             Particulier pour  la  prernidre fois,  il  est plus
Filmtyps  ist  est  ratsam, sich zu  vergewissern,           prudent de  v6rifier si  I'on a bien appliqu6 le
dass  der   richtige  Wert   verwendet  wurde,               chiffre  de   rapidit6  d'6mulsion  Weston   qui
bevor   der   grcissere Teil des Filmes belichtet             convient, avant d'exposer beaucoup de pellicule.
worden  ist. Fehlerquellen, die vom verwendeten           Les erreurs dues au  mat6riel sont souvent  la
Filmapparat herriihren, ktjnnen zu Unter- oder           cause d'un manque ou d'un excds de pose, il
Ueberbelichtungftihren.  Die  hier angegebenen           faudra donc prendre un chiffre de rapidit6 Weston,
W e s t o n - W e r t e    s o l l t e n       i m   F a l l e   v o n           dans la liste, plus petit si les r6sultats r6vdlent une
Unterbelichtung  herabgesetzt, im   Falle  von             insuffisance de pose, ou  plus grand en cas de'
Ueberbelichtung heraufgesetztwerden.                      surexposition.
                       4                www.orphancameras.com                 5