ExposureforElementaryPhoto基本的照片曝光

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1、ExposureforElementaryPhotographyExposureTogetarichimagewithrealistictones,darkbutdetailedshadows,bright,delicatehighlights,andvibrantcolorsyouneedtoexposecorrectly.ExposureChoseacombinationofapertureandshutterspeedsettingstoallowtherightamountoflightforeachscene.ExposureThebest

2、printsresultfromproperlyexposeddigitalfilesandnegatives.ExposureThepurposeofcorrectexposureistogetjusttherightamountoflightontothecapturesensororfilmframe.ExposureAcorrectlyexposedimageissomewhatlikeafullglassofwater.Waterrunningslowlywilltakearelativelylongtimetofilltheglass.Wat

3、erturnedtofullblastwilltakearelativelyshorttimetofillaglassCorrectExposureWhethertheexposureismade(theglassisfilled)slowlyorquicklywithafastorslowexposuretime,orthroughasmallorlargeopening,thegoalisthesame:togetaproperlyexposed,butnotoverexposed,image(fullglassofwater).Correctexp

4、osureusingdigitalcaptureAcorrectexposureonnegativefilm4VariablesthatinfluenceExposure.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