Portrait lens thiab nws tus yam ntxwv

Raws li twb tseeb los ntawm lub npe, portrait lens - qhov no yog ib tug uas yog siv rau portraits thiab muab nws tej zoo ntawm tus kws yees duab. Nyob rau hauv qhov tseeb, tsis tooj mus rau nrov lub tswv yim, xws li "portrait" lens tsis muaj nyob. Hais tias yog, tus manufacturers tso lub lens, tsis txhob cia siab tias nws hais rau tej qho zoo ntawm shooting. Yog li ntawd feem ntau los ib tug ntau sib cav tswv yim hais txog dab tsi yuav tsum yog tus zoo tshaj plaws portrait lens. Nyob rau hauv cov ntaub ntawv no, kiag li tsis coj mus rau hauv tus account lub fact tias tag nrho cov kev pab txog tua nyob rau hauv sib txawv tej yam kev mob, lawv txhua tus nws muaj nws tus kheej yus nyeem tau thiab lawv tseem ceeb. Yog li ntawd, nyob rau hauv no tsab xov xwm peb yuav kawm txog cov yam ntxwv ntawm lo ntsiab muag, lub feem ntau siv rau portraits.

Cov thawj thiab lub ntsiab yam ntxwv ntawm tej lens - nws luminosity. Aperture taw los sau tias f, uas yog cov lus qhia txog cov nyiaj pab ntau tshaj aperture. Nws yog yooj yim: lub wider lub aperture ntawm koj lens yog qhib, qhov ntau lub teeb ntog rau hauv matrix, qhov ntau dua nws luminosity. Tus me tus xov tooj f, lub aperture yuav qhib dav. Portrait lens yuav tsum muaj lub siab aperture piv uas tso cai rau koj los mus tsim ntse paub meej, uas yog tsis tshua muaj ib qho tseem ceeb nyob rau hauv portraiture. Piv txwv li, ib tug portrait lens Canon lub EF 85mm f / 1.2 yog ib qho ntawm feem neeg sawv cev ntawm no kauj thiab ho surpasses ntau lwm tus neeg.

Yuav kom xaiv ib tug portrait lens, nws yog ib qho tseem ceeb los mus txiav txim yog dab tsi focal ntev koj siv ntau. Nws yog zoo dua lub npe hu hais tias rau portraits zoo siv fixes (i.e., lo ntsiab muag nrog focal lengths unchanged) thiab tsis muaj zoom lo ntsiab muag vim lawv muaj ib tug ntau dua aperture piv vim lub tsis tuaj kawm ntawv lens tsev lub luag hauj lwm rau lub approximation. Muaj ntau cov tub txawg ntseeg hais tias tus portrait lens yuav tsum muaj ib tug focal ntev ntawm 50 mus rau 200 mm. Nrog ntau dua focal ntev muab ib tug zoo bokeh - plooj duab - thiab yuav ib tug ntau dua kev ncua deb ntawm tus kws yees duab thiab cov qauv. Uas yog, yog tias koj nyob nraum shooting nyob rau hauv ib tug me me studio, lub portrait lens ntawm 200mm koj mus dab tsi. Koj yuav tau kawg opt rau lub zoom lens yuav tsum tau mus kho qhov kev ncua deb ntawm lub koob yees duab rau cov qauv rau koj saj, tab sis nws siv yuav tsum tau zoo teeb pom kev zoo. Nyob rau hauv tas li ntawd, ib tug zoo zoom lens yog feem ntau kim tshaj tsau.

Secondary, tab sis sib npaug ib qho tseem ceeb cov yam ntxwv - lub xub ntiag ntawm ib cov duab stabilization system thiab lub hom kom pom tseeb. Cov duab stabilizer compensates rau lub koob yees duab co, ces nws yeej tsis mob. Nrog rau kev tsom xam ib tug me ntsis nyuab me ntsis. Zoo, ntawm chav kawm, xaiv ib tug lens nrog ob tug ua kom pom tseeb hom - ceev thiab tsis siv. Yog hais tias, hais tias, koj yuav siv los tsuas ib phau ntawv, yog tsim nyog yuav tau nco ntsoov hais tias tej zaum tshwm sim txawj teeb meem nyob qhov twg tus kub siab manually mus nrhiav xwb ntev ntev los yog tsis yooj yim.

Yog li ntawd, ua ntej koj xaiv ib tug lens rau portraits, txiav txim siab yuav ua li cas koj npaj yuav siv nws. Thiab, nyob ntawm seb dab tsi koj xav tau los npaj rau lawv tus kheej ua ntej thiab qhia hais tias tus feem ntau pom kev. Qhov no yuav tso cai rau koj kom nqaim cia cov kev tshawb fawb, thiab tsis muaj tsis ntseeg rau txoj kev xaiv.