Txawm hais tias kev yees duab digital muaj ntau ntau lub tsev kawm ntawv cov yeeb yaj kiab qub uas siv tsis tau lawm, qee qhov tseem muaj txiaj ntsig zoo. Ib qho ntawm cov no yog lub voj voog polarizer lim.
Lub voj voog polarizer ntxiv cov teebmeem zoo rau koj cov duab. Nws yog ib qho kev dag ntxias uas cov kws yees duab tshaj lij vam khom los tsim cov duab ci ntsa iab nrog cov xim nplua nuj thiab zoo sib xws.
How a Polarizing Filter Ua haujlwm
Tsav kom yooj yim, lub polarizer txo cov teeb pom kev zoo uas mus rau koj lub koob yees duab cov duab sensor. Nws txiav tawm lub teeb pom kev tsis zoo thiab qhov kub hnyiab ntawm huab cua thiab tso cai rau lub koob yees duab los ntes cov duab pom tseeb dua.
Yog tias koj tau hnav looj tsom iav dub polarizing hnub ci nyob ze ntawm lub cev dej, koj tau pom tias cov polarizer ua dab tsi. Lawv sib sib zog nqus lub ntuj xiav thiab ua rau huab zoo li pop tawm ntawm keeb kwm yav dhau. Lawv tshem tawm cov kev xav tawm ntawm cov dej saum npoo av, tso cai rau koj pom tob rau hauv dej dua li tsis muaj koj lub tsom iav. Ib yam li ntawd, lub caij ntuj no scenes muaj qhov tob dua vim hais tias qhov kev xav ntawm cov daus yog neutralized. Cov lim dej polarizing muaj qhov cuam tshuam zoo ib yam ntawm lub koob yees duab.
Polarization yog qhov ua tau zoo tshaj plaws ntawm 90 degrees rau lub hnub lossis lwm yam teeb pom kev zoo. Qhov siab tshaj plaws polarization tshwm sim thaum koj qhov kev kawm nyob ntawm lub kaum sab xis rau lub hnub. Ntawm 180 degrees (thaum lub hnub nyob tom qab koj), polarization tsis muaj nyob. Ntawm ob lub ntsiab lus no, tus nqi ntawm polarization txawv.
Yuav Siv Li Cas Polarizing
Ib lub voj voog polarizing lim screws mus rau pem hauv ntej ntawm lub koob yees duab lens thiab muaj ob lub nplhaib uas tig. Txhawm rau siv lub polarizer, tsuas yog ntswj lub nplhaib pem hauv ntej kom qhib polarization.
Teem koj lub hom phiaj, tom qab ntawd nrhiav qhov point ntawm qhov siab tshaj plaws polarization. Qhov no yuav pab tau vim hais tias lub nplhaib pem hauv ntej ntawm lub lens uas lub polarizer txuas nrog tuaj yeem tig raws li nws tsom thiab pov tawm ntawm polarization. Txawm hais tias koj yuav tsum rov tsom mus tom qab polarizing, lub lim yuav tsum tseem nyob rau hauv kev sib haum xeeb uas koj tau tso tseg (tshwj tsis yog koj hloov cov ntsiab lus tseem ceeb).
Saib koj lub koob yees duab zaub thaum tig lub nplhaib lim. Yog tias qhov kev xav ploj mus thiab qhov sib txawv ntawm cov ntsiab lus xws li lub ntuj xiav thiab huab nce, polarization tshwm sim.
Tips
Xyaum nrog kev xav thiab lub ntuj xiav thaum siv rau cov lim polarizing. Nqa qee cov duab ntawm tib qhov chaw ntawm qhov siab tshaj plaws polarization thiab tsis muaj polarization, thiab sib piv ob. Qhov txawv yuav tsum yog qhov txaus ntshai.
Thaum koj paub txog qhov cuam tshuam ntawm polarization, koj yuav pom muaj tswv yim siv tshaj li kev siv hluav taws xob tua lub ntuj, dej, thiab kev xav.
Yog tias koj muaj ntau lub lo ntsiab muag nrog qhov sib txawv ntawm cov lim dej sib txawv, koj tuaj yeem tawm mus nrog ib lub lim dej polarizing. Tsuav qhov sib txawv ntawm cov lim qhov loj me tsis yog qhov hnyav heev, lub nplhaib nce lossis nqis qis yuav ua haujlwm. Cov khoom siv pheej yig no tuaj yeem muaj ntau qhov ntau thiab tsawg thiab siv tau kom haum, piv txwv li, 58mm lim rau lub lens uas siv 52mm lim.
Ntau tus kws yees duab tsis tshua pom cov polarizers tawm ntawm lawv lub lens.
Qhov tsis zoo ntawm lub lim dej polarizing
Siv lub lim polarizing txo cov teeb pom kev mus txog lub koob yees duab sensor los ntawm ntau npaum li ob lossis peb lub f-stops, yog li koj yuav tsum kho qhov no hauv ib txoj hauv kev no:
- Xaiv lub kaw lus qeeb qeeb (thiab siv lub koob yees duab, yog tias xav tau).
- Qhib los ntawm kev xaiv rau qis f/stop.
- Ntxiv lub teeb rau qhov chaw-ntawm tib lub kaum sab xis, yog tias ua tau.
Lub teeb ci qis tsis zoo rau kev siv lub tshuab lim polarizing. Yog tias koj xav txiav kev xav txog lig nyob rau nruab hnub lossis tsom cov huab thaum hnub poob, siv lub tripod.
Xaiv lub lim dej polarizing
Polarizing filters tsis pheej yig, thiab qhov zoo yog qhov tseem ceeb ntawm koj lub lim nrog koj lub lens. Cov iav zoo tshaj plaws tsim cov duab zoo tshaj plaws.
Linear vs. Circular Polarizing Lim
Polarizing filters muaj nyob rau hauv ob hom: linear thiab ncig. Linear polarizing cov ntxaij lim dej yog siv rau phau ntawv-tsim zaj duab xis koob yees duab. Txawm hais tias lawv tuaj yeem pom lub teeb pom kev zoo dua li lub voj voog polarizer, lawv tuaj yeem ua rau koj lub koob yees duab hluav taws xob puas tsuaj.
Tsis txhob yuav cov kab polarizer siv nrog DSLR. Nws tuaj yeem ua rau koj lub koob yees duab hluav taws xob puas tsuaj.
Qhov sib txawv, cov polarizers tau tsim los ua haujlwm nrog autofocus lo ntsiab muag thiab cov khoom siv hluav taws xob nyuaj.
Thaum koj yuav khoom lim, saib cov cim. Yog tias lub lim tau cim tsuas yog "polarizer," ces nws yog linear polarizer. Vajvoog polarizers yeej ib txwm cim "circular polarizer."
