Ntau tus kws yees duab tshiab tau ntsib nrog cov lus nug ntawm yuav ua li cas tua qhov no lossis qhov kev pom ntawd zoo tshaj plaws thiab zoo nkauj tshaj. Thaum ua haujlwm nrog lub teeb, qhov tob ntawm daim teb, thaum tua nyob rau hauv lub teeb qis, tua txav mus rau lwm qhov chaw, paub yuav ua li cas kom raug teeb tsa lub coupler raug thiab qhov txiaj ntsig koj tuaj yeem tau txais yuav pab tau.
Nws yog qhov tsim nyog
Lub koob yees duab, lens, kos duab
Cov Lus Qhia
Kauj ruam 1
Lub sij hawm "diaphragm" los ntawm Greek lo lus rau "septum", nws lub npe lwm lub npe yog aperture. Lub diaphragm yog cov cuab yeej tshwj xeeb los ua rau lub lens kom tswj tau txoj kab uas hla ntawm lub qhov uas tso cai rau lub teeb kom nkag mus hauv qhov sib luag. Qhov piv ntawm txoj kab uas hla ntawm lub lens mus rau lub focal ntev yog hu ua aperture piv.
Kauj ruam 2
F sawv rau tus f-naj npawb, uas yog tus rov qab ntawm lub lens aperture. Hloov F los ntawm ib qho nres, peb tau txais qhov kev hloov pauv ntawm txoj kab uas hla ntawm lub aperture qhov yog 1, 4 zaug. Thiab tus nqi ntawm lub teeb poob rau hauv matrix yuav hloov 2 zaug.
Kauj ruam 3
Qhov me dua aperture, qhov tob tob ntawm daim teb ntawm qhov chaw ncaj ncees, i.e. thaj chaw hauv cov ntsiab lus ntse hauv ib puag ncig cov ncauj lus. Koj tuaj yeem tsim lub qhov xav tau ntawm lub ntsej muag, nyob ntawm tus qauv ntawm lub koob yees duab, ua haujlwm los ntawm cov ntawv qhia zaub mov lub koob yees duab los ntawm kev hloov lub nplhaib aperture ntawm lub lens lossis lub log tswj ntawm lub koob yees duab.
Kauj ruam 4
Qhov qis dua tus naj npawb F, qhov loj dua ntawm qhov aperture, uas txhais tau hais tias lub taub ntawm lub lens qhib yuav dav dua thiab ntau lub teeb nkag rau hauv lub sensor. Qhov ntau ntau yog f1.4, f2.8, thiab lwm yam Rau 50mm lub lens, qhov tob ntawm qhov teb yuav siab tshaj ntawm f22, thiab ntawm f1.8, qhov tseeb yuav yog me me. Piv txwv li, thaum tua duab thaij sab nrauv, txhawm rau kom muaj lub ntsej muag ntshiab thiab qhov muag plooj, lub aperture yuav tsum tau teem rau me f2.8. Yog hais tias daim duab dai yog clamped ntawm qhov tsis sib xws, i.e. teeb tsa qhov loj aperture tus nqi, tom qab ntawd tus lej feem ntawm cov ncej yuav ua kom pom tseeb.
Kauj ruam 5
Qhov ntev npaum li cas lub sij hawm uas lub teeb ntaus hluav taws ntog raug txhom hauv matrix yog hu ua shutter speed. Lub koob yees duab kaw nws. Aperture thiab shutter ceev yog cov xa mus rau raws li raug khub. Qhov nce hauv rhiab heev yog inversely proportional rau kis, i.e. yog tias qhov rhiab heev yog ob npaug, qhov kev nthuav tawm kuj tseem yuav tsum halved. Txhawm rau ntsuas kom ntsuas qhov nrawm nrawm, qhov feem ntawm ib pliag yog siv: 1/30, 1/60, 1/125 lossis 1/250 s.
Kauj Ruam 6
Txav rau cov ncauj lus txav, lub tshuab ntsuas nrawm nrawm yuav tsum siv kom tsis txhob ntog. Txhawm rau xam qhov yuav tsum tau kaw lub ntsuas nrawm, koj yuav tsum paub txog dab tsi focal ntev koj yuav tau tua. Piv txwv, lub lens yog 24-105 hli, nws tau ncua ntawm ib nrab - txog 80 hli. Thiab vim tias qhov siab tshaj plaws yuav tsum tsis txhob ceev tshaj qhov tus nqi inversely xwm yeem rau lub focal ntev, qhov sib txawv kaw yuav tsum tau teeb tsa tsis pub ntev tshaj li 1/80 s. Lub tshuab kaw luv luv siv rau "khov" kev txav: tus noog ya davhlau, tee ntog, tus kis las khiav, thiab lwm yam.
Kauj Ruam 7
Rau kev tua thaum hmo ntuj lossis thaum tsaus ntuj, lub zog qeeb qeeb yog qhov zoo dua. Nws yuav pab kom pab txhawm rau paub tus ncej. Thaum tua nrog lub qeeb qeeb qeeb, muaj qhov zoo siab ntawm qhov muag plooj lub thav duab, hauv qhov no nws tsim nyog siv optical stabilization lossis lub kos. Xws li ib qho kev sib kis yuav ua rau koj mus tua cov kev nthuav zoo - qhov "tsiv" ntawm yav tsaus ntuj thiab hmo ntuj tua tsheb tsiv.
Kauj ruam 8
Thaum tua dej, lub tshuab kaw nrawm yog qhov tseem ceeb heev. Nrog lub sijhawm luv kaw, dej yuav zoo ib yam li iav. Thaum tua cov dej ntws qeeb thiab ntws ntws, nws yog qhov zoo uas siv kev nrawm nrawm ntawm 1/30 s thiab 1/125 s. Kev nqhuab ntws lossis cov yoj tawg ntawm cov pob zeb yuav tsum tau tua ntawm lub zog me me ntawm 1/1000 s, vim hais tias nws yuav cia koj ua haujlwm zoo splashes hauv kev nthuav dav. Rau kev tua cov ciav dej thiab dej tsaws tsag, qhov ntsuas hluav taws xob ntev yog qhov tsim nyog - nws yuav tso cai rau koj kom piav qhov kev txav ntawm dej.
