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Understanding Exposure The exposure triangle and it’s components

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Page 1: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

UnderstandingExposure

Theexposuretriangleandit’scomponents

Page 2: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

The3componentsofexposure

• Aperture• Shu9erspeed• ISO(ASA)

Page 3: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Defini@ons

•  Apertureisthedensityoflightenteringthecamera.

•  Shu9erspeedisthe@metheshu9erisexposingthefilmplanetolight.

•  ISOisthesensi@vitytolightoftheFilmorsensor.

Page 4: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Sowhatdotheymean!Aperture

•  Apertureisthesizeoftheholeproducedbytheapertureblades.

•  ItisnormallydefinedinFstops.•  i.e.normallyfromf1.2tof32•  Thefnumberisafrac@on.•  Thereforewitha50mmlensa25mmdiameterholeisf2.Witha500mmlensa125mmholeisonlyf4!

Page 5: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 6: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Shu9erSpeed

•  Shu9erspeedisnormallymeasuredinsecondsorfrac@onsofseconds.

•  i.e.normallyfrom8sto1/8000s!•  Longexposuresarenormally1/4sorlonger•  Shortorquickexposuresarenormally1/500sorless!•  Camerashakehappenswhenyouuseashu9erspeedlongerthanthethefocallengthofthelens.

•  i.e.witha50mmlenshandheldlongerthan1/50sor1/60sistherule.

Page 7: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 8: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

ISO(ASA)

•  Thesensi@vityofthefilmorsensor.•  NormallyIS0100to6400(100,500NOW!)•  Thelowerthenumberthelesssensi@vethecameraistolight.Thehigherthemore.

•  i.e.ISO100needslotsoflight/sun.ISO12800canbeusedinadarkroom.

•  ThehighertheISO,themoregrain/noise.

Page 9: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 10: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Whatdotheydo?

•  Apertureeffectstheamountoflightenteringthecameraandthedepthoffield(DOF).

•  Shu9erspeedeffectstheamountofmo@onrecorded.

•  ISOeffectsthesensi@vityofthecameratolightandtheamountofgrain/noiseproduced.

Page 11: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Depthoffield(DOF)

•  Thisisdefinedasthedistanceofobjectsinfocus.

•  i.e.whetherjusttheobjectisinfocusortheforegroundandbackgroundareinfocustoo!

•  AshallowDOFiswherejusttheobjectisinfocus.(UsedinPortraits)

•  AdeepDOFiswheretheforegroundandbackgroundareinfocus.(UsedinLandscapes)

Page 12: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 13: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Mo@onBlur

•  Mo@onbluristheamountofmo@onshowninthephoto.

•  i.e.capturingananimalrunningorwaterflowinginariver.

•  Ahighshu9erspeed“freezes”anobject.•  [email protected].

Page 14: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Highshu9erspeed1/1000s

Slow/Longshu9erspeed4s

Page 15: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

GrainorNoise.

•  Grainornoiseistheamountofspecklesordiscolouringontheedgesofobjects.

•  InFilm,Grainisnormallysceneasspeckleddots.Digitallyitproducesdiscoloura@onontheedgesofobjects.

•  100ISOhasfinegrainorlownoise,3200ISOandabovehasharshgrainorhighnoise.

Page 16: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 17: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Gedngtherightexposure.

Page 18: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

EverythingyouadjustseffectstheExposure!

Page 19: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

ModesonyourCamera

ProgramMode:Automa@callyadjustsApertureandShu9erspeedwithafixedISOShu9erPriority:Automa@callyadjustsAperturewithafixedShu9erspeedandISOAperturePriority:Automa@callyadjustShu9erspeedwithafixedApertureandISOManual:ApertureandShu9erspeedmustbeadjustedaccordinglywithafixedISO

Page 20: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 21: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 22: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 23: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 24: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 25: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 26: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 27: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 28: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 29: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally
Page 30: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

Newspapers.HanginginFujifilmUKofficesinBedford

Page 31: Understanding Exposure - Bicester Camera Club …bicestercamera.club/Files/expPDF.pdfShuer Speed • Shu9er speed is normally measured in seconds or frac@ons of seconds. • i.e. normally

OsneyHeronasprintedintheOxfordMail


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