Cov tsom iav Varifocalyog ib hom lens uas siv dav hauv kev thaij duab. Lawv tuaj yeem hloov lub kaum sab xis thiab cov duab los ntawm kev kho qhov ntev ntawm lub lens, uas tso cai rau ib lub lens thaij ntau yam xwm txheej sib txawv yam tsis tas yuav hloov lens ntau zaus, yog li ua tiav "ib lub lens rau txhua yam".
1.Cov txiaj ntsig tseem ceeb ntawmvarifocalcov iav
(1)Kev hloov pauv ntawm cov khoom sib xyaw
Piv rau cov iav tsom iav uas tsom tsis tu ncua, cov iav tsom iav varifocal tuaj yeem npog ntau qhov ntev ntawm lub lens hauv ib lub lens, ntes tau ntau lub zeem muag sib txawv. Lawv tso cai rau kev hloov pauv sai ntawm lub kaum sab xis dav mus rau telephoto yam tsis tas hloov cov iav tsom iav, ua rau lawv tsim nyog tshwj xeeb rau cov xwm txheej uas xav tau kev hloov kho sai, xws li kev mus ncig thiab kev thaij duab xwm txheej.
Piv txwv li, txij li thaj chaw dav dav mus rau qhov ze ntawm cov khoom nyob deb, kev siv lub lens zoom tsuas yog tig lub nplhaib zoom, tiv thaiv koj kom tsis txhob plam lub sijhawm los ntawm kev hloov lens.
(2)Kev yooj yim nqa thiab siv tau yooj yim
Ib lub lens varifocal tuaj yeem npog tau ntau lub kaum sab xis dav mus rau nruab nrab telephoto, ua tau raws li ntau yam kev xav tau ntawm kev thaij duab. Nws tuaj yeem hloov tau ntau lub lens fixed focus, txo qhov hnyav ntawm kev nqa thiab lub sijhawm siv hloov lens, ua rau nws zoo tagnrho rau cov xwm txheej uas koj xav tau kev mus ncig ua si, xws li kev thaij duab ntawm txoj kev thiab kev taug kev hiking.
Piv txwv li, thaum thaij duab txoj kev, lub lens telephoto siv tau los thaij duab sai sai ntawm qhov chaw uas ib tug noog ya los yog ib qho xwm txheej nyob deb, thaum lub lens dav siv tau los thaij duab tib neeg ze ze.
Cov tsom iav Varifocal muaj cov qauv yooj ywm thiab siv tau yooj yim
(3)Kev muaj peev xwm tua phom dynamic
Hauv kev thaij duab xws li video, cov iav zoom tso cai rau kev hloov kho lub nplhaib zoom tes lossis lub cev muaj zog kom zoom rau hauv thiab tawm, coj tus neeg saib lub qhov muag, tsim kom muaj kev zoom du rau cov teebmeem txav ntawm lub koob yees duab, thiab txawm tias tsim cov teebmeem tshwj xeeb. Piv txwv li, siv lub iav zoom los thawb lub nplhaib zoom ntawm qhov ceev qeeb tuaj yeem tsim cov teebmeem radial dynamic.
(4)Hloov kho sai sai rau cov xwm txheej hloov pauv
Hauv cov xwm txheej uas teeb pom kev zoo, ib puag ncig, thiab cov ntsiab lus hloov pauv tas li, xws li kev thaij duab ntawm txoj kev, kev kaw cov xwm txheej, thiab kev mus ncig, cov iav zoom tso cai rau koj kho qhov kev tsom mus rau ntau yam xwm txheej yam tsis tas yuav hloov iav sai sai.
2. VarifocalCov lus qhia siv lens
Thaumcov iav ntau yammuaj ntau yam yooj yim thiab muaj kev ywj pheej hauv kev thaij duab, yuav tsum muaj qee yam kev txawj siv kom siv tau tag nrho lawv lub peev xwm.
(1)Sib phim qhov ntev focal sib txawv raws li qhov xwm txheej
Siv cov focal lengths sib txawv tuaj yeem tsim cov duab sib txawv, thiab cov xwm txheej sib txawv kuj xav tau cov focal lengths sib txawv. Piv txwv li:
Cov iav tsom iav dav dav yog qhov tsim nyog rau kev thaij duab toj roob hauv pes thiab kev tsim vaj tsev, ua rau pom kev pom thiab qhov tob ntawm qhov chaw, tab sis yuav tsum ceev faj kom tsis txhob muaj kev cuam tshuam ntawm ntug ntawm daim duab;
Cov qhov ntev focal lengths txheem yog tsim rau kev thaij duab txoj kev thiab kev thaij duab portrait, muab kev pom ze ntawm lub neej txhua hnub thaum tseem xav txog ib puag ncig, ua rau lawv tsim nyog rau kev thaij duab documentary, nrog rau kev nias ntuj thiab tom qab mos mos;
Cov tsom iav telephoto yog tsim rau kev thaij duab tsiaj qus thiab kev ua kis las, ua rau kev thaij duab deb thaum tsis cuam tshuam nrog tus neeg raug thaij, thaij cov ntsiab lus deb, thiab tshem tawm cov keeb kwm yav dhau los kom pom qhov tseem ceeb.
Cov iav Varifocal tuaj yeem phim nrog ntau qhov ntev ntawm qhov sib txawv raws li qhov xwm txheej
(2)Kev tsom mus rau qhov ntev focal
Thaum siv lub lens varifocal, ua ntej tshaj plaws, tsom mus rau qhov deb ntawm telephoto, tom qab ntawd xaiv qhov ntev focal kom raug los thaij duab. Qhov no ua rau kev tsom mus rau qhov tseeb dua. Ntawm qhov deb ntawm telephoto, daim duab ntawm tus neeg yuav loj tshaj plaws thaum qhov tob ntawm daim teb me tshaj plaws, ua rau kev tsom mus rau qhov tseeb. Qhov no pab tau tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej teeb pom kev zoo lossis cov teeb pom kev zoo sib xws, qhov twg siv lub lens telephoto tso cai rau kev ntsuas qhov chaw kom raug.
(3)Tsis txhob cia siab rau zoom ntau dhau,tsis txhob ua kom cov khoom siv tsis zoo
Qhov yooj yim ntawm kev siv ntawmcov iav ntau yamtej zaum yuav ua rau koj tsis xav thaij duab ntxiv lawm, tsuas yog tig lub zoom ring xwb los thaij duab, ua rau koj tsis xav thaij duab ntau dhau thiab tej zaum yuav ua rau koj tsis xav thaij duab zoo. Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias kev hloov lub lens qhov focal length yuav ua rau koj pom kev tsis meej, thaum kev txav lub koob yees duab yuav ua rau koj pom kev tsis meej.
Kev txav lub koob yees duab ze dua lossis deb dua tuaj yeem tsim cov teebmeem sib txawv ntawm qhov chaw thiab keeb kwm yav dhau los. Yog li ntawd, kev siv lub lens varifocal yuav tsum tau txav mus nrhiav lub kaum sab xis zoo tshaj plaws thiab tom qab ntawd kho qhov ntev ntawm lub focal kom tsim cov duab zoo dua.
(4)Ua tib zoo mlooglubkev ruaj khovntawm lubkawg ntawm telephoto
Cov tsom iav telephoto feem ntau yuav ua rau lub koob yees duab co, ua rau cov duab tsis meej. Hauv cov xwm txheej zoo li no, nws yog qhov tsim nyog los nce qhov ceev ntawm lub shutter lossis siv cov cuab yeej stabilization duab. Tshwj xeeb tshaj yog thaum siv cov tsom iav varifocal nrog qhov ntev focal ntawm 200mm lossis ntev dua, nws raug pom zoo kom siv tripod lossis cov cuab yeej zoo sib xws los tswj lub lens. Qhov no txo qhov kev co thaum tuav tes, ua kom muaj kev ruaj khov ntawm kev thaij duab, thiab txhim kho qhov ntse ntawm cov duab.
Kev ruaj khov yog qhov tseem ceeb heev thaum thaij duab nrog lub lens telephoto
(5)Ua tib zoo saib xyuas qhov kev hloov pauv ntawm qhov aperture thiab qhov tob ntawm daim teb
Qhov qhib siab tshaj plaws ntawm feem ntau cov iav zoom txo qis thaum qhov ntev ntawm lub lens nce ntxiv. Qhov no txhais tau tias ntawm qhov kawg telephoto, qhov qhib siab tshaj plaws me dua, txo qhov ntau ntawm lub teeb nkag mus rau hauv lub lens thiab ua rau qhov tsaus ntuj ntawm keeb kwm yav dhau los tsis muaj zog. Yog li ntawd, nyob rau hauv qhov xwm txheej tsaus ntuj lossis thaum xav tau qhov tsaus ntuj ntawm keeb kwm yav dhau los, siv qhov kawg ntawm lub lens dav lossis nce ISO.
Yog xav tau cov nyhuv bokeh loj ntawm qhov kawg telephoto, yuav tsum muaj lub qhov loj dua lossis qhov deb tua ze dua. Ntxiv mus, txhawm rau tswj qhov tob ntawm daim teb, koj tuaj yeem sim kom nkag siab txog qhov cuam tshuam ntawm qhov ntev focal sib txawv rau qhov tob ntawm daim teb. Piv txwv li, kev tua nrog qhov ntev focal luv dua thiab tom qab ntawd zooming tuaj yeem ua rau keeb kwm yav dhau ntse dua, yog li tau txais qhov tob ntawm daim teb zoo dua.
(6)Siv lub lens hood kom tsim nyog
Cov tsom iav Varifocalmuaj cov qauv nyuaj dua thiab pawg lens pem hauv ntej loj dua, ua rau lawv yooj yim raug teeb pom kev tsis zoo, uas tuaj yeem ua rau muaj teeb ci ntsa iab thiab ghosting. Kev siv lub lens hood yog qhov tseem ceeb rau kev txo cov teebmeem flare no; kev siv hom lens hood kom raug tuaj yeem txhim kho qhov zoo ntawm daim duab thiab qhov sib piv, yog li ua kom zoo dua qhov zoo ntawm daim duab.
(7)Siv cov lim dej nrog kev ceev faj
Feem ntau tsis pom zoo kom siv cov lim dej rau cov iav zoom tsuas yog tias tsim nyog xwb. Hauv qee qhov chaw, xws li ntug hiav txwv lossis dej ntsev, cov lim dej tiv thaiv lossis cov lim dej polarizing tuaj yeem siv tau, tab sis siv lwm cov lim dej tsuas yog yuav ua rau muaj teeb meem kev cuam tshuam lub teeb hauv lub lens, uas tuaj yeem yooj yim rov qab los.
Thaum siv lub lens varifocal, xyuam xim rau kev tswj lub teeb
Ntxiv mus, cov xwm txheej thaij duab sib txawv xav tau cov txheej txheem sib txawv thaum siv cov iav sib txawv. Piv txwv li, hauv kev thaij duab mus ncig, lub iav zoom tuaj yeem npog lub kaum sab xis dav mus rau telephoto hauv ib lub lens; lub qhov me me tuaj yeem siv rau kev thaij duab toj roob hauv pes thaum nruab hnub, thaum lub iav telephoto nruab nrab nrog lub qhov loj tuaj yeem siv rau kev thaij duab txoj kev thaum tsaus ntuj.
Xaus lus,cov iav ntau yammuab kev ywj pheej muaj tswv yim siab, txhawb nqa kev thaij duab uas xav tau kev kho kom zoo. Txawm li cas los xij, ua tus kws thaij duab, tsuas yog paub txog cov txheej txheem varifocal lens tsis txaus; kev xyaum ntau thiab kev paub dhau los yog qhov tseem ceeb los hloov cov txuj ci no mus ua kev nkag siab, cia koj siv tag nrho cov txiaj ntsig ntawm zoom lens thiab tswj ntau yam xwm txheej kev tshaj lij nrog kev yooj yim dua.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-26-2025
