Nqi rau kev siv tshuab yog pheej loj zuj zus thiab cov nqi ntawm cov koob yees duab thiab lawv lub Cheebtsam yog siab, yog li nws tseem ceeb heev kom tsis txhob ua yuam kev thaum xaiv. Muaj ob peb yam tseem ceeb thiab kev tshuaj ntsuam xyuas yuav ua li cas thiaj kuaj tau lub lens thaum yuav khoom, thiaj li yuav tau txhaj tshuaj zoo nkauj.
Lens kos
Cov neeg koom nrog photography, ntxov los sis tom qab xav txog xaiv ib lub lens tshiab . Kev yuav khoom hauv lub khw, ib tug neeg muaj lub lav uas muab nws lub sijhawm, yog tias tsim nyog, yuav pauv lossis xa rov qab cov khoom. Ua tsaug rau qhov no koj tsis tuaj yeem ntshai ntawm yuav khoom siv tawg. Yog tias koj xaiv cov khoom siv, ces koj yuav tsum paub seb yuav kuaj lub lens kom tsis txhob tau txais "miv hauv qhov quav".
Yuav ua li cas los xyuas lub lens thaum mus kav khw hauv khw?
Kev yuav ib lub lens tshiab hauv khw, koj xub ua ntej yuav tsum tau nyeem tag nrho cov ntaub ntawv thiab yeej pom qhov kev lees paub. Muaj ob peb lub tswv yim hais txog kev sim lens tshiab thaum nriav:
- Nws raug pom zoo tias koj xub paub koj tus kheej li cas lub lens yuav tsum saib, mus rau cov ntsiab lus me me, vim yog tias koj tsis paub nws, koj yuav tsis pom tias qhov tsis muaj ib qho tseem ceeb. Sib piv cov npe ntawm cov ntaub ntawv uas teev nyob rau hauv cov ntaub ntawv nrog rau cov khoom muaj nyob.
- Saib xyuas cov nkoj, cov rooj zaum, cov khoom xauv thiab cov xais ntsej muag, uas yuav tsum tig rov qab thiab khov kho.
- Tus ntaus ntawv siv lo ntsiab muag, uas yog qhov zoo ntawm cov duab nyob. Nws yog ib qho tseem ceeb los xyuas tias lawv tsis khaus thiab lwm yam kev puas tsuaj.
- Lwm lub tswv yim yog yuav xyuas cov lens thaum twg koj yuav tau - yog tias ua tau, nruab rau ntawm koj lub koob yees duab thiab coj ob peb qho kev txhaj tshuaj rau lub zeem muag, qhov qhia nrov, thiab kev ua kom pom tseeb thiab ua li ntawd.
Yuav ua li cas los xyuas lub lens thaum yuav nrog txhais tes?
Ua ntej koj muab nyiaj rau qhov tseem ceeb ntawm tus SLR , nws yuav tsum tau ua daim tshev, vim qhov kev pheej hmoo ntawm kev dag.
- Kuaj lub lens ua ntej yuav pib yuav pib nrog ib qho kev kuaj pom. Them nyiaj tshwj xeeb rau lub lens, siv lub teeb xais. Sab nraud ntawm lub hull yog ib lub sijhawm rau kev khom nqi.
- Muaj ntau cov neeg tsis ncaj ncees sim muag cov cuab yeej uas tau raug kev puas tsuaj loj, thiab kho tsis tau txais txiaj ntsig ntev. Yuav ua kom paub tseeb tias lub lens rau hauv kev kho, nws yog qhov yuav tsum tau los kuaj xyuas cov screws, uas yuav tsum tsis txhob raug khawb. Yog hais tias lub qhov qhib rau ntawm lub screws yog bent los yog torn, ces qhov no yuav qhia kev kho rau cov kws tshwj xeeb tsis tsim nyog.
- Kos lub lens mechanics: tig cov npib hloov, nyem cov nyees khawm thiab cov levers.
- Cov kauj ruam tom ntej hauv kev qhia, yuav ua li cas thiaj li kuaj xyuas cov lens thaum koj muas, nrog rau kev sim ua haujlwm. Rhais lub lens, thiab nws yuav tsum muab khi ruaj khov rau lub koob yees duab, tsis muaj zog rov thab plaub. Coj ob peb qho koob tshuaj ntawm thaj chaw ze thiab nyob deb ntawm "Infinity" hom tsom xam.
- Kos lub lag luam flash, yog li xaiv qhov kev ua rau shooting yuav tsum sib npaug ntawm txhua qhov chaw nyob. Qhov kev kuaj no tseem ceeb heev rau cov lo ntsiab muag uas qhia qhov ze ntawm lub koob yees duab.
Muaj ntau ntau phau ntawv tsom mus rau kev sim lens thiab cov tseem ceeb tshaj plaws uas tau hais hauv qab no.
Yuav ua li cas ntsuam xyuas lub lens tom qab tsom ntsoov rau sab nraud?
Tshaj tawm ntawm daim tshev, cov lus qhia hauv qab no yuav tsum tau pom zoo:
- Tig lub koob yees duab thiab teev tus nqi ISO nws tsis siab dhau. Kev kuaj lub lens nyob rau sab nraum qab yog nqa tawm hauv hom autofocus. Tseem xav xaiv hom tua shooting, M lossis A yog tsim.
- Muab lub koob thaij duab tso rau ntawm ib lub kos thiab tso qhov phiaj xwm hauv qab no rau ntawm ib qho chaw tiaj tus. Ua ib daim ntawv lo lus tseem ceeb, siv qhov khiav ceev rau saum toj kawg nkaus.
- Qhib ntawm qhov chaw ua kom pom tseeb thiab tsom qhov lens ntawm qhov chaw ntawm lub phiaj xwm. Tom qab ntawd, tso cov lus qhib siab tshaj plaws rau ntawm lub koob yees duab.
- Nws yog qhov yuav tsum tau kom sib npaug kis tau tus kab mob kom tsis txhob tuaj tawm tsaus ntuj lossis lub teeb duab. Tsom ntsoov rau lub hom phiaj, tsom ntawm qhov seem nrog tus ntoo khaub lig. Siv ib daim duab.
- Hauv kauj ruam tom ntej, muab tus nqi nruab nrab qhov nruab nrab, piv txwv, 5.6. Ua kom muaj qhov sib npaug ntawm qhov tseem ceeb ntawm qhov ntsuas lub ntsuas thiab ua kom pom tseeb hauv cov cheeb tsam uas tau qhia ua ntej. Nqa lwm daim duab.
- Saib cov duab thiab kev ua kom pom tseeb yuav tsum yog qhov chaw nws tau hais.
Yuav ua li cas ntsuam xyuas lub lens rau sharpness?
Nws muaj kev ntsuam xyuas yooj yim heev uas tuaj yeem siv tom tsev. Nws yog ib qho tsim nyog yuav tau dai ib daim ntawv xov xwm ntawm phab ntsa thiab taws nws rau ob tog sab nraud.
- Kuaj lub lens rau kev ua ntu zus pib nrog tag nrho qhib lub aperture. Tsom lub koob yees duab ntawm cov ntawv xov xwm hauv phau ntawv los yog tsis siv neeg.
- Nco ntsoov tias lub dav hlau ntawm lub matrix (sab nraum qab ntawm lub tshuab ntaus ntawv) yuav tsum ua kom tig mus rau qhov ntawv xov xwm.
- Ua ib qho kev ntsuam xyuas rau txhua qhov tseem ceeb ntawm qhov siv qhov ceev nrawm.
- Txheeb xyuas, koj yuav tsum download cov duab captured rau koj lub computer thiab saib lawv ntawm 100% magnification. Daim ntawv ceeb toom yuav ua li cas lub sharpness txo mus rau ntug, tshwj xeeb tshaj yog thaum lub aperture yog qhib tag nrho. Yog hais tias qhov txo yuav luag imperceptible, ces lub lens yog ntse.
Yuav ua li cas mus xyuas lub lag luam ntawm lub lens stabilizer thaum yuav?
Thaum muas ib lub koob yees duab uas twb tau siv lawm, nws raug pom zoo los xyuas cov stabilizer. Yog tias koj ua qhov no hauv static, koj yuav tsum muab cov khoom rau saum rooj thiab ua kom pom tseeb rau nws. Nws yog tsim nyog kom paub tseeb tias tsis muaj kev pib oscillations ntawm kev sib txuas ntawm qhov sib txawv. Yog tias koj xav saib xyuas lub lens stabilizer li cas, ces koj yuav tsum tau siv lub ntaus ntawv hauv koj txhais tes thiab tua thaum tsiv lub lens thiab cov duab yuav tsum tshwm sim nrog qeeb.
Yuav ua li cas los soj ntsuam lub lens los ntawm tus xov tooj?
Hmoov tsis, tab sis falsification ntawm technology nyob rau hauv peb lub sij hawm yog ib qho phenomenon. Muaj ntau tus neeg siv xav paub saib cov lens los ntawm cov naj npawb ntawm "Nikon" los yog lwm yam koob yees duab. Hmoov tsis, tab sis siv tus nqi no tsis tuaj yeem ntseeg tau ntawm "legality" ntawm cov txheej txheem, txij li thaum nws tau muab tso tom qab sib dhos thiab ua ntej muag. Qhov tsuas yog tov, yuav ua li cas los xyuas lub lens thaum yuav khoom - nrhiav ib daim ntawv pov thawj khoom muaj npe nrog lub hologram.