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1、数码摄影入门必备常识(专业知识)Introductiontodigitalphotographynecessaryknowledge(knowledge)feb14,2011onMondaytothehomepageJointhecollectionhelp
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14、knowledge(knowledge)introductiontocomputerdigitalphotography(reproduced)2Thenumberofreadingson2010-09-12:viewthecollection:801ThesourceofthepublicsourceWelcometobrowsethearticleinthelibraryofthetwopeople,wanttocollectthisgoodarticle,hurryup,haveownpersonallibraryin1minu
15、te!Ialsowanttocollectthereportifyoupostexistingpornography,violence,reactionaryonthispage,pleasefillinthefollowingformtocontactus:Howtomakenotesandcommentsintext?Intheparametertableofthecamera,therearesimilarf2.8-4/?Whatdoyoumeanbyf3.5-f5/F7.6-F11?Answer:thecameralensap
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
