Muaj lub koob yees duab zoo, thaum xub thawj koj tuaj yeem txaus siab rau tus qauv txheem, tab sis yeej ib txwm los lub sijhawm thaum nws tsis txaus, nws zoo li yog tias koj xav tau qee yam ntxiv. Hauv cov xwm txheej zoo li no, tsawg leej xav xav yuav lub koob yees duab tshiab, tab sis ntau tus neeg xav txog kev hloov lub lens. Thaum xaiv lub lens duab, koj yuav tsum tau them sai sai rau cov cwj pwm hauv qab no.
Cov Lus Qhia
Kauj ruam 1
Ua ntej tshaj, nco ntsoov tias tsis yog txhua lub lens yog haum rau qee lub koob yees duab. Ntau cov chaw tsim khoom tshwj xeeb ua lawv cov koob yees duab tsis haum nrog lo ntsiab muag los ntawm lwm cov tuam ntxhab. Piv txwv li, Canon siv Canon EF mount, Nikon siv Nikon AF thiab lwm yam. Yog li no, ua ntej koj yuav tsum pom dab tsi ntawm koob yees duab thiab mount koj muaj.
Kauj ruam 2
Tus yam ntxwv thib ob kom paub txog yog focal ntev. Ua raws li qhov ntsuas no, lo ntsiab muag tau muab faib ua hom: - focal ntev ntau ntawm 8-22 hli - siv rau kev tua cov toj roob hauv pes, kos duab, ntu nruab nrab (tshwj xeeb hauv chav cramped);
- 28-80 hli - haum rau tua xwm txheej, ceeb toom;
- txij li 80 thiab siab dua - xws li focal ntev yog qhov tsim nyog rau kev ncaws pob ncaws pob, cov khoom nyob deb, cov tsiaj qus.
Kauj ruam 3
Qhov taw qhia tom ntej yog aperture piv. Qhov loj dua nws yog, qhov dav dua aperture qhib, ntau lub teeb yuav tsoo lub txhoj ntawm lub sijhawm tam sim ntawd thiab tsawg dua koj tuaj yeem tsim qhov kaw lub nra. Yog li, koj tuaj yeem tua tau yooj yim txawm tias tsis tshua pom kev mob, xws li hauv kev ua yeeb yam lossis chaw ua si.
Kauj ruam 4
Yog tias koj yuav mus tua cov macro, tom qab ntawd ob qho tshwj xeeb lo ntsiab muag thiab universal lo ntsiab muag nrog kev ua haujlwm ntxiv macro yuav haum koj.
Kauj ruam 5
Thaum yuav khoom hauv khw muag khoom, koj yuav tsum txheeb xyuas cov ntsiab lus hauv qab no: - saib lub lens hauv lub teeb, yuav tsum tsis txhob muaj cov hmoov av hauv nws, vim tias feem ntau tsis tuaj yeem tshem lawv tawm ntawm qhov ntawd. Txhua qhov sib txawv ntawm plua plav yog ib qhov chaw ntawm cov duab tsim tawm;
- lub ntug thiab qhov aperture nyees khawm yuav tsum tsiv mus nyob zoo, tsis muaj jamming. Yog tias qhov sib tsoo nrov tau hnov thaum lub zog txav, tom qab ntawd nws zoo li lub lens tau nqis lawm, nyob rau hauv rooj plaub twg cov khoom yuav tsum raug tso tseg;
- Tom qab txuas lub lens rau lub koob yees duab, tshawb xyuas autofocus muaj nuj nqi. Nyob rau hauv nruab hnub zoo, lo ntsiab muag tsis muaj teeb meem tsom;
- cov ua ntej thiab tom qab lo ntsiab muag yuav tsum huv si ntawm stains, streaks thiab lwm yam khoom siv ntawm kev siv.
