LEICA R3 EXPOSURE ABILITIES BOOKLET Product booklet

The LEIGA Rs has
 two autornatic exposure-measuring           rnodes3
 Selective and Integrating.
 Because two are better
 than ortG.





               TEITZ Means Precision.
                World Wide.                                                                                                                                         l z z t . t t t - t t sl e n s t .

  o


                                   2e'28rrrF   Selected-area  measuremgnt           Largefield integratingmeasurin$'ai'ea


  Thedualmeasuringmethodof the electronicLEICAR 3 offers
  numerousadvantages:neverbeforehas it been possibleto
  use a LEICA@as simplyas the LEICAR 3 and withoutany
  technicalknowledge.Neverbeforehas a LEICAofferedso
  manypossibilitiesandat the sametimesimplificationsas the
  LEICAR 3. In additionto manydetails,exposuremeasure-
  mentwassingledoutforadaptationto practicalphotographic
  requirements:
  Only the LEIGAR 3 can boast of largefield integrating and
  selected.arleameasurementwith automatic data storage.
  Withoutthe needfor takingthe cameraotf your eye you can
  switch over within a fraction of a second.The electronic
  mechanisminstantlycalculatesthe conect exposure,which
   is indicatedwith shutterspeed and aperturein the view-
  finder.Evenyour firstfilmwill giveyou much pleasureand
  confirmour ambitiousclaim of "perfectpictureswithout
  technicalproblems".

Selected-area
     measurement:



Only selectedmeasurementwill be successfulwhen the
backgroundas shown in our examplesbelow is either
very bright or very dark and thereforebound to falsifythe
readingof the exposuremeter.Becauseno exposureme-
ter can discriminatebetweenblackand white,i.e.brightor
dark,by itself.lt can forthis reasonbe calibratedonly for
a meangreyvalue,wh ich correspondsto about 18%reflec-
ting powerof a grey area.Selectivemeasurementis there-
fore inidicatedwheneverthe contrastrange is very high
with unevendistributionof brightand dark areasor when
the sun illuminatescertain picture portionslike a spot-
light,with indoorshotsagainstbrightwindows,with views
througha gate,orwhenopenlightsourcesandotherdazz-
ling influencesare to be eliminated.Detailsof subjects s
                                                                                                                                                                                             ctr4-. 1.-::which representthe "meangrey value"can be measured
withthe selected-areamode.lt is usedwhenit is necessary
to take full advantageof the creativepossibilitiesof light
and when a certainportionof the subjecthasto be exactly
exposed.





ln the picturesof the top rowthe facewas chosenas the measuringf ieldof the
exposuremeter and a correctlyexposedpictureobtained.The bottom row
showsfaultyresults,producedwhen the brightor dark surroundingfield is
includedin the measurement.The facewill then be eitherover-or under-ex-
posed.



 '-   Registered Trademark.

Design subject to alterations without notice.
ERNST LEITZ WETZLAR G M BH
D-6330Wetzlar Tel.:(0 6441) 29-1 Telex:483 849 leiz d
Subsidiaries:ErnstLeitz(Canada)Ltd.,Midland,Ontario
Leitz-PortugalS.A.R.L.,VilaNovade FamaligSo


                                              Printed in W.-Germany                 lll/78/AY/L.,.,  E-t*          I "nn,.                      www.orphancameras.com

Automaticdata storage:
                                                        I                                                                                  'l


The automaticstoragefacilityis extremelyusefulwhen                                                                                                                                  IIt                        picturethe    selectedly           measured                           area                                            is off-centre,                                      and     Ithe   measured           value               hasto                   be stored                                  untilthe                                    desiredpic-
ture areahas been chosen or the correct momentof ex-
posurehas arrived.Whenthe slack of the releasebutton
is taken the measuringsystemwill store the displayed
valueand hold it for up to 30 seconds,i.e.untilthe button
isf u llydepressed.This automaticstorageisverysimpleto
operate.lt is the specialrefinementof the LEICAR 3, ex-
tendsthe scope for creativepictorialcompositiondeci-
sively and offers possibilitiesunthinkablebefore the
technologicalbasisfor themwas established.Substitute
measurementscan,for instance,be quicklymadeof any
desiredsubject arearepresentativeof the exposurebe-
forethe finaldeterminationof the picturearea.
Exceptionally,whendatastorageof 30 secondsis insuffi-
cient,the exposuretime can be set manually.





Sequenceof pictures,top to bottom:





Faultyexposureswith integratingmeasurement





Exposuretime correctlydeterminedby selected-areameasurement,
but the pictureareacouldbe improvedupon
                                                                                                                                      f(
                                  1C
                                                  s                                                         lv



Optimum composition made possible by automatic data storage              ::   tr
                                                                                                                                                                                              Fi:

                      www.orphancameras.com

Integrating           T
     measurement             in



Experiencehas shownthat in certainlymorethan 90%ofall casesintegratingmeasurementis correctand reliable. r
BecauseLEITZlargefieldintegratingmeasurementotfers
practicalcentreweightingthrougha highlysophisticated
interactionbetween3 photo cells.Verysoon it givesthe
LEICAR 3 usertheconfidencethat he willexposehis pic-
turescorrectly,withoutproblems,in all normalsituations.
Wrth this automatic setting, the LEIGA R 3 can be en-
trusted without qualms to any member of the family. For
all subjectsthat do not includehigh lightingcontrasts,
almost invariablyin incident light and when no heaw
shadowsare present- when bright and dark areasare
evenly distributed,and no strong colour contrastsare
present.As well as underan overcastsky, in diffuselight,
and generallyin all photographicsituationsthat leaveno
timefor selectingan areafor spot measurement.





        -'-        L L


 Plus-minuscorrection
Ordinarysubjectssuch as those shown in the top row have a uni-
form distributionof dark and bright object details.They therefore
correspondto a meangreyvalueof 180/oreflection.But if the subjects
have predominatelybright or dark areas as in the bottom row, and,
exceptionally,selected-areameasurementis not possible,the
measuringvaluescan be correctedon the rotaryring of the DIN/ASA
settingdisc.
Thissimple* and - adjustmentfor specialcasesin conjunctionwith
integratingmeasurementcorrects underexposurescaused by too
muchbrightness,for instanceon the beachand in snow,and overex-
posurescausedby dark portionsor at night.
The picturesof the cablecar and of the wallof the shipwereexposed
"+ 1" longerand "- 1" shorterthan recommendedby the exposure
meter.(Strongcontrejour light may requireadjustmentof * 2,very
darksubjectsof - 2).