Tau txais lub duab zoo, qhia tag nrho cov nuances ntawm lub teeb raws li cov yam ntxwv tiag ntawm cov khoom raug tua, pom rau tib neeg lub qhov muag, yog kev npau suav ntawm txhua tus kws yees duab lossis tus neeg ua haujlwm. Qhov kis tau tus mob uas yuav tsum muaj ntawm lub teeb rau sau cov duab ua haujlwm siab nyob ntawm qhov raug.
Cov Lus Qhia
Kauj ruam 1
Tawm hauv kev yees duab yog qhov ntsuas qhov muaj txiaj ntsig ntawm cov nyhuv ntawm lub teeb ntawm txheej txheej photosensitive ntawm matrix lossis duab zaj duab xis. Tus nqi no yog sib npaug nrog cov khoom ntawm lub luminous flux (lub teeb pom kev zoo) poob rau ntawm qhov kho tau los ntawm lub sijhawm sib nrug thaum lub teeb ua rau nws. Kev sib kis tau ntsuas hauv "lux-ib-ob" - lux * s.
Kauj ruam 2
Technically, hloov ntawm lub tswvyim ntawm "raug", lo lus "expo-par" feem ntau siv. Expo yog kev sib txuam ntawm ob qhov tsis xws luag, ntsuas nrawm nrawm thiab aperture. Raug yog lub sij hawm nyob nruab nrab lub sij hawm uas lub teeb cuam tshuam rau txheej txheej photosensitive ntawm matrix lossis emulsion ntawm zaj duab xis duab. Lub kaw hluav taws xob ceev yog "lub luag haujlwm" rau lub kaw hluav taws xob, uas, tom qab ib lub sijhawm, thaiv lub luminous flux.
Kauj ruam 3
Lub diaphragm (los ntawm Greek. "Muab faib") yog cov khoom siv kho qhov muag hauv cov qauv ntawm lub lens, uas tso cai rau koj kho qhov nyiaj ntawm lub teeb kis, uas yog los tswj kev sib haum xeeb ntawm lub teeb ci ntawm cov duab thaij thiab cov khoom raug tua. Cov. Tsis tas li ntawd, lub aperture tuaj yeem siv los tswj qhov tob ntawm daim teb thaum thaij duab.
Kauj ruam 4
Tau ntsuas lub ntsuas raug rau qhov txhaj tshuaj hu ua "metering". Hauv cov koob yees duab pib xyaum ua, cov txheej txheem no feem ntau yog kev siv tshuab. Hauv kev tshaj lij ntawm cov koob yees duab, qhov no yog qhov hloov tau. Raug metering siv rau hauv tus account qhov rhiab heev ntawm zaj duab xis (matrix), sib piv, deb rau cov ntsiab lus, thiab lwm yam.
Kauj ruam 5
Hauv kev yees duab, "kev them nyiaj raug" feem ntau siv. Nov yog qhov hloov pauv (ceev) ntawm kev sib txuam. Cov txheej txheem no yog siv yog tias cov txiaj ntsig ntawm qhov ntsuas hluav taws xob tam sim no tsis tso cai rau koj qhia qhov tseeb ntawm lub teeb ntawm lub yees duab, piv txwv li, cov ncauj lus muaj qhov hloov pauv zoo los ntawm lub teeb ci ntsa iab mus rau cov duab ntxoo sib sib zog nqus, zoo li thaum tua tsaus nti tom hav zoov tiv thaiv qhov ci ntuj xiav. Tsis tas li, qhov them nyiaj raug thov tau thaum tua tawm tsam lub teeb ci (lub hnub, lub teeb ci) lossis tiv thaiv keeb kwm yav dhau los ntawm hnub tuaj / hnub poob.
