Tsis txhob txhawj xeeb, Feem ntau cov Yees Lub Lens Cov Teeb Meem Yav Yuav Tsum Tau Txaus
Txawm tias cov lithes lub koob yees duab pheej yig tshaj plaws muaj cov cim zoo, thiab lawv tuaj yeem tsim cov duab zoo. Txawm li cas los, tsis muaj dab tsi yog infallible, thiab seb lub lens nqi $ 80 los yog $ 6,000, koj tseem muaj peev xwm tseem khiav mus rau ob peb qhov teeb meem. Ntawm no yog yuav ua li cas kom tsis txhob muaj teeb meem ntau hom lens koob yees duab.
Vignetting
Vignetting tshwm sim thaum lub ces kaum ntawm ib daim duab ua kom pom tsaus nti li yog tias tus duab ntxoov ntxoo nyob ib puag ncig daim duab. Qhov no yog tshwm sim los ntawm cov ntug ntawm lub lens ua tau raug ntes hauv daim duab.
Vignetting feem ntau yog thaum tua cov qhib apertures thoob plaws (piv txwv li f / 1.8, f / 4, thiab lwm yam) thiab siv lub lens wide-angle.
Yuav ua li cas kho Vignetting
- Ib txoj hauv kev yooj yim kom tsis txhob vignetting yog kom nres kom txog thaum tsaus npoo ploj.
- Yog tias koj siv Photoshop rau kev kho cov laj thawj, koj tuaj yeem tshem tawm cov vignetting uas siv cov "Lens Correction Filter."
Chromatic Aberration
Qhov no kuj qee zaum hu ua "fringing," vim nws ua kom muaj xim khov nyob ib ncig ntawm cov npoo ntawm cov duab sib txawv.
Piv txwv li, feem ntau koj yuav pom cov duab ntxig ntxig thaum thaij duab tawm tsam lub ntuj ci. Nws yog tshwm sim vim hais tias lub lens tsis tsom cov wavelengths ntawm lub teeb rau ntawm qhov chaw focal tib yam.
Yuav ua li cas kho cov Chromatic Abberation
- Nws muaj peev xwm raug kho los ntawm kev siv lo ntsiab muag uas muaj ob los sis ntau daim iav uas muaj ntau yam zoo, xws li Nikon ED los yog Canon UD lo ntsiab muag.
Lens Flare los yog Ghosting
Lub teeb pom kev zoo nyob thoob plaws lub koob yees duab lens los yog lub zog muaj zog heev yuav ua tau rau cov ghosting los yog lens flare. Kev ywj pheej yog qhov sib txawv ntawm kev txo tus sheen ntawm ib daim duab thiab lens flare yog me ntsis ntawm lub teeb nyob hauv tus duab.
Yuav ua li cas kho Lens Flare thiab Ghosting
- Qhov yooj yim tshaj los rhuav tshem ntawm qhov teeb meem no yog siv lub lens hood., Uas yuav thaiv txoj kev teeb ntawm lub qhov rooj ntawm lub koob yees duab lens. Ntau cov tuam ntxhab tam sim no muaj xws li lub lens hood thaum koj yuav ib lub lens.
- Hloov koj lub kaum ntse ntse thiab txoj hauj lwm mus rau lub teeb ci yog lwm txoj hau kev los tiv thaiv ob qho teeb meem.
Cov teeb meem ntawm qhov teeb meem
Cov teeb meem nrog kev xav yog feem ntau pom thaum thaav duab hauv lub tsev thaum ntsia saum toj. Cov kab ntawm lub tuam tsev yuav tshwm sim los ze zog thiab nyob ze rau saum lub tsev. Qhov no tsim ib qho kev saib tsis pom kev zoo vim tias peb lub hlwb xav paub tias cov kab tsis ua raws li qhov tseeb.
Yuav ua li cas thiaj kho tau
- Cov kws yees duab tuaj yeem kho cov teeb meem kev xav tau los ntawm kev siv lub siab tilt thiab ua haujlwm qis.
- Ib qho pheej yig dua yog los kho qhov kev xav tau siv "Skew" hauv Photoshop.
Cheeb Distortion
Nrog chim distortion , cov dluab tshwm rau muaj qhwv ib ncig ntawm ib lub thoob, thiab qhov chaw ntawm daim duab pom loj dua cov npoo. Qhov no yog los ntawm kev sawv ze ze ntawm koj qhov kev kawm thiab zooming tawm (siv lub focal ntev dav).
Ntses-qhov muag lens duab yog cov huab piv txwv tshaj ntawm chim distortion ho nyob rau hauv cov ntaub ntawv no nws yog cov nyhuv yam ntawm kev siv lub lens.
Yuav ua li cas kho cov thwj thev fais fab
- Tsuas nrawm dua thiab zoom rau (siv lub focal ntev ntev).