数码摄影入门必备常识(专业知识)

数码摄影入门必备常识(专业知识)

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时间:2018-07-19

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16、ertureFvalue,itisnotjustaquestionofaperture,actualsaidislight,alsorelatedtothefactorssuchasthefocallengthofthelens,isarelativevalue.Fortheusualzoomlens,eveniftheaperture'sphysicalapertureisconstant,thelengthofthefocallengthwillbesmallerandtheapertureFwillbesmaller.F3.5-

17、f5/F7.6-F11says:themaximumapertureisinthewideAngle,thefocallengthisF2.8,atthelongfocus,thefocallengthisF5.TheminimumapertureisatthewideAngle,thefocallengthisF7.6,atthelongfocus,thefocallengthisF11.Ofcourse,theadvancedprofessionallenshasaconstantaperture,thatis,theFvalue

18、doesnotchangewiththefocallength,butthatisinthecaseofthezoom,thephysicalapertureoftheapertureischangingaccordingly.Thelensofconstantapertureismuchmoreexpensivethantheaveragelensofthesamequality.Whyisitthatthesmallestapertureofadigitalcameraisnotsmallenough,suchasthec-700

19、isF8,theN995isF10,andthetraditionalcameraisF11,F16orevenF22?Answer:wesayatordinarytimestheaperturef,F8,F16isap

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