Cov haujlwm ntawm tus kws yees duab tsuas yog yooj yim. Los ntawm sab nraud, nws zoo li tias koj tsuas yog yuav tsum tau nias lub pob thiab tau txais cov keej zoo ntawm qhov tawm ntawm. Tab sis qhov tseeb, qhov no yog qhov kev ua haujlwm tiag tiag, uas koom nrog tsis tsuas yog kev ntsuas tas mus li ntawm lub teeb, xim thiab cov nyob ntawm tus ncej, tab sis tseem yuav tsum ua cov txheej txheem txuas ntxiv, uas siv sijhawm ntau.
Txhawm rau kom cov ntawv teeb tsa tig los ua kom tau qhov zoo thiab zoo nkauj los ntawm cov saib zoo nkauj ntawm qhov teeb meem, koj xav tau lub koob yees duab portrait. Feem ntau lo ntsiab muag nrog lub focal ntev ntawm 50mm, 85mm lossis 105mm yog siv rau cov laj thawj no. Lawv muab daim duab zoo nkauj thiab qhov muag pom qhov muag plooj tom qab ntawm lub cim tseem ceeb.
Lwm qhov tseem ceeb yog nyob deb li cas qhib lub lens aperture yog. Qhov tseem ceeb tshaj plaws yuav tsum nco ntsoov yog qhov ntau koj qhib nws, qhov tsawg dua qhov tob ntawm koj tau txais hauv kablus. Cov ntaub ntawv no tseem ceeb heev thaum tso cov cim hauv tus ncej.
Yog tias peb tab tom tua ib tus neeg xwb thiab xav kom tau lub nraub qaum zoo nkauj, qhib qhov aperture kom ntau li ntau tau. Nikon lub lens nrog lub focal ntev ntawm 85mm tso cai rau koj qhib lub aperture los ntawm 1, 4. Tib lub sijhawm, tom qab yog qhov muag plooj kiag li. Tab sis nco ntsoov txog qhov tob ntawm daim teb - vim nws yog qhov tsawg heev, qhov chaw muaj lub thaj tsis pub dhau 10 cm, nrog qhov sib tua deb ntawm 85 cm. Yog li ntawd, kev tsom xyuas yuav tsum tau ua kom tiav rau lub xub ntiag ntawm tus qauv lub qhov muag. Yog tias koj siv lub lens lens thiab tsis txhob siv lub portrait lens, nws yog qhov tsis zoo thiab koj tuaj yeem tau txais cov kev txhaj tshuaj zoo. Peb unscrew nws mus rau focal ntev peb xav tau: 50mm, 85mm, thiab tom qab ntawd qhib qhov aperture mus rau qhov siab tshaj plaws - feem ntau 2, 8 lossis 3, 5. Tom ntej, xaiv cov ISO tsim nyog (qis dua tus nqi, suab nrov tsawg peb tau txais hauv lub thav duab), thiab lub ntsuas hluav taws xob nrawm, uas yuav tuaj yeem tua yam tsis muaj ib lub kos.
Thaum tua lub tsev neeg cov duab hauv tsev, lub focal ntev yuav xaiv tau txawm tsawg, tab sis lub aperture yuav tau raug kaw. Nrog lub qhov tob ntiav heev ntawm daim teb, tsis yog txhua tus phab ej ntawm qhov kev tua tuaj yeem poob rau hauv ib feem ntawm qhov chaw ntawm lub qhov chaw muaj zog, yog li ntawd nws yog qhov zoo tshaj plaws los tua tsev neeg lub tsev duab nrog qhov kaw ntawm 3, 5 - 5, 6. Lub keeb kwm yav dhau yuav tau pom tseeb dua, tab sis txhua tus qauv yuav tau txais cov ntsiab lus meej, uas qhov teeb meem no tseem ceeb dua.
