Qhov tob ntawm daim teb - yog dab tsi?

Niaj hnub no, photography tau ua ntau heev. Txawm li cas los, nws yuav rightly xam tau tias yog ib daim ntawv ntawm daim duab. Txawm li cas los, kos duab yog tej yam txawv, vim nws yuav tsum tau tsis tsuas muaj tswv yim, tswv yim, tab sis kuj kev txawj ntse.

Ib tug yeej heev artistic dluab yuav ua tau tsuas yog nyob rau ib tug zoo reflex koob yees duab. Nws tsis yog txaus cia li mus muaj ib tug lub koob yees duab, koj yuav tsum to taub nws. Thiab ntawm no yog cia li thiab pab tau theoretical kev txawj ntse. Koj yuav tsum paub dab tsi lub qhov tob ntawm daim teb, aperture, thiab diaphragmatic tooj, lub focal ntev. Cia li owning lub hom phiaj, koj muaj peev xwm siv cov koob yees duab tag nrho.

Basic ntsiab duab

Rau ib tug kom to taub txog dab tsi ntawm qhov tob ntawm daim teb, koj yuav tsum pib los txhais lub ntsiab ntawm "focal ntev" thiab "aperture". Peb yuav hais tias qhov focal ntev yog mas rau tshem lo ntsiab muag.

Focal ntev yog qhov kev ncua deb ntawm lub dav hlau ntawm lub matrix thiab tus kho qhov muag qhov chaw ntawm lub lens. Nyob rau hauv no tej lub txiav txim los ntawm tus piv ntawm lens focal ntev mus rau ib tug kab pheeb ces kaum matrix. Raws li, qhov luv luv lub focal ntev, lub saib lub yog dav.

Yuav kom to taub li cas ib tug diaphragmatic tooj, koj yuav tsum to taub dab tsi lub aperture ntawm lub lens. Thaum nws cov tub ntxhais yog ib qho qhib los ntawm kev uas lub teeb kis tau. Nyob rau hauv kev txiav txim hais tias lub qhov yog varied, lub diaphragm yog ua los ntawm ob peb daim hlau. Rau cov yuav txo tau ntawm lub orifice daim hlau yog txo, thiab lub teeb nyob rau hauv lub lens tsawg tsis raug nws. Thaum yuav nteg qe lawv, ntsig txog, lub teeb penetrates ntau.

Diaphragmatic tib tooj - yog ib qho kev ntsuas, uas yog inversely xwm yeem mus rau txoj kab uas hla ntawm lub qhov nyob rau hauv lub diaphragm. Nws yog tsim los ntawv f. Uas yog, yog tias f muaj ib tug me me nqi, lub diaphragm yog dav qhia tawm.

Tam sim no peb txhais li cas yog qhov tob-of-teb. Qhov no ntau yam yog ib tug ntshiab lub zeem muag ntawm cov khoom uas yog nyob rau hauv pem hauv ntej ntawm cov kev kawm thiab tom qab nws. Raws li yuav tsum muaj tseeb los ntawm lub ntsiab txhais, ntau yuav yog nyob ntawm seb dab tsi cov kwv yog nyob rau hauv kom pom tseeb.

Los ntawm tej yam tob ntawm daim teb nyob?

Ntawm cov hoob kawm, rau ib tug kws yees duab nws yog ib qho tseem ceeb kom paub tias tag nrho cov saum toj no cov yam ntxwv lub koob yees duab, raws li zoo raws li yuav tsum tau tswj lawv. Qhov tob ntawm daim teb tej zaum yuav txawv nyob ntawm seb ob peb tsis. Qhov loj tshaj plaws yog dab tsi txiav txim daim duab, nws diaphragmatic tooj los yog txoj kab uas hla diaphragms.

Nyob tos nyob rau hauv cov ntaub ntawv no yog ncaj qha proportional. Hais tias yog, qhov ntau diaphragmatic tooj, ntau dua qhov lub qhov tob ntawm daim teb. Koj muaj peev xwm xav tias nws lawv tus kheej, ua rau cov dluab ntawm lub tib lub nruas txawv aperture. Yog hais tias phrenic xws li f / 22, lub qhov tob ntawm daim teb yog ntau tshaj nyob rau f / 8.

Muaj ntau tej zaum yuav xav tias nyob rau hauv cov ntaub ntawv no nws yog ib qho zoo rau cov duab ntawm lub siab tshaj plaws aperture yog kaw, tab sis nws tsis yog. Nws tsis yog ib txwm tau ib tug zoo yees duab yog tsim nyog tias txhua yam uas muaj tseeb. Qhov no yog tshwj xeeb tshaj yog muaj tseeb nyob rau hauv cov ntaub ntawv ntawm portrait shooting. Feem ntau rau ib tug muaj kev vam meej portrait yog tsim nyog tias tom qab tau qhov muag plooj. Nws cia li yuav tsum tau ua los ntawm qhib lub aperture dav.

Los yog tej zaum yuav muaj lub sij hawm thaum koj yuav tau kawm txog tej yam cov ntsiab lus ntawm lub ntsej muag. Ces kuj nws siv shooting nrog thoob plaws-qhib aperture.

Tsis tas li ntawd nyob rau hauv lub clarity ntawm lub lens aperture, uas yog, lub siab tshaj plaws nqi ntawm lub teeb uas yuav kis tau los ntawm nws. Feem ntau siv rau cov ntaubntawv povthawj siv studio aperture lo ntsiab muag uas muaj ib tug ib txhis bandwidth.

Yog hais tias koj yuav mus coj cov duab nyob rau hauv txoj kev, nrog zoo ntuj kaj, koj tsis tas yuav mus yuav no lens. Txij li thaum ntuj kaj yog heev txaus kom tau cov duab uas muaj ib tug tseeb duab ntawm tus kwv.