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1、Exposure for ElementaryPhotographyExposureTogetarichimagewithrealistictones,darkbutdetailedshadows,bright,delicatehighlights,andvibrantcolorsyouneedtoexposecorrectly.ExposureChoseacombinationofapertureandshutterspeedsettingstoallowtherightamountoflightforeachscene.ExposureThebest
2、printsresultfromproperlyexposeddigitalfilesandnegatives.ExposureThepurposeofcorrectexposureistogetjusttherightamountoflightontothecapturesensororfilmframe.ExposureAcorrectlyexposedimageissomewhatlikeafullglassofwater.Waterrunningslowlywilltakearelativelylongtimetofilltheglass.Wat
3、erturnedtofullblastwilltakearelativelyshorttimetofillaglassCorrectExposureWhethertheexposureismade(theglassisfilled)slowlyorquicklywithafastorslowexposuretime,orthroughasmallorlargeopening,thegoalisthesame:togetaproperlyexposed,butnotoverexposed,image(fullglassofwater).Correctexp
4、osureusing digitalcaptureAcorrectexposure onnegativefilm4VariablesthatinfluenceExposure.Amountoflightonthesubject.ApertureorFstopselection.Shutterspeedselection.ISOSensitivityofthecameraselectionorfilmspeed1.AmountoflightonthesubjectBrightdayatthebeachoronsnowSunnycleardayCloudyD
5、ay,fog,rainDuskorDawnInsideNight2.ApertureSizeoftheopeningofalensdeterminedbythepositionoftheapertureblades-openinguptoalargercircle,orclosingdownControlsthevolumeoflightMeasuredinf-stopnumbersAperturef-StopsExpressedasanumberMathematicalfractionApertureSpacecreatedbyopeningorclo
6、singdown:DiaphragmoraperturebladesMetalpieceswhichcreatetheApertureTheApertureControls?Exposure?DepthofField3.ShutterSpeedSettingonthecameraorlensthatdetermineshowlongtheshutterisopenallowinglighttostrikethecapturesensororfilm.ShuttercanbeafocalplaneorleaftypeSLRfocalplaneshutter
7、smaytravelhorizontallyorvertically.ShutterSpeedsControlExposureMotion4.ISO/SensitivityInternationalStandardsOrganizationThesensitivityofthefilmordigitalcamerasetting(100,200,400,800,etc)Expressedasanumberthatismeasuredin‘stops’ExposureHowcanwemeasurethelighttodetermine?Howtosetth
8、ef-stop&Shutterspeed?Howdowechosesensiti
