Cov kos duab ntawm kev thaij duab yog hloov kho tas li thiab nyiam cov duab tshiab nyob hauv nws daim npog. Yog tias koj tseem xav kawm yuav ua li cas kom thaij tau cov duab zoo nkauj, koj yuav tsum paub qhov koob yees duab lub koob yees duab ceev dua.
Lub luag hauj lwm thev taus zoo ua dab tsi?
Ua ntej daim duab xa mus rau daim npav nco, qee yam muaj tshwm sim hauv lub lens thiab hauv lub koob yees duab tag nrho. Tej zaum koj yuav tau pom tias cov duab tawm los nrog lub ci sib txawv thiab nrog cov sib txawv ntawm cov teeb thiab duab ntxoov ntxoo. Cov qhov muag pom no cuam tshuam ncaj qha rau ntau npaum li cas lub teeb lub lens pub dhau mus rau lub ntsuas pa.
Thaum qhib, lub ntsuas hluav taws xob tso siab rau ob txoj kev teeb tsa: aperture thiab, qhov tseeb, shutter ceev. Lub tom kawg yog lub luag haujlwm rau lub sijhawm uas dhau los ua ntej lub lens kaw. Nws yog ntsuas hauv vib nas this. Vim tias qhov nrawm nrawm nrawm tsis yog txiav txim siab qhov tshwm sim ntawm daim duab, nws nyuaj rau piav qhia qhov tseem ceeb ntawm cov txheej txheem no tsis muaj aperture. Lub diaphragm yog qhov muab faib ua nws tus kheej, uas, nyob ntawm qhov chaw teeb tsa, hloov nws txoj kab uas hla, yog li tswj hwm tus nqi ntawm lub teeb rau hauv lub matrix.
Yuav ua li cas siv ceev kaw
Lub tshuab kaw hluav taws xob tau hloov kho raws lub tswv yim thiab cov xwm txheej nyob hauv qab uas cov duab thaij. Yog tias nws nyob tsaus ntuj hauv tsev lossis sab nraum zoov, ces koj yuav tsum tau tsim lub ntsuas hluav taws xob qeeb heev. Lub sijhawm uas yuav tau teeb tsa hauv lub koob yees duab lub koob yees duab, ib lub teeb txaus yuav nkag mus rau lub lens. Tus nqi no yuav ua rau daim duab nplua nuj, ci thiab tob.
Cov teeb meem tseem ceeb nrog kev cuam tshuam ntev yog tias koj txav tsis tau lub koob yees duab thaum nws tua. Txawm hais tias qhov qis me me xwb los yuav ua rau plooj tawg. Yog li no, txhawm rau siv qhov ntev ntev rau hauv koj txoj haujlwm, koj yuav tsum tau yuav ib qho chaw nres nkoj ntawm lub koob yees duab yuav tas.
Yog tias qhov tob ntawm daim duab tsis tseem ceeb, thiab qhov tseem ceeb yog kom muaj sijhawm los ntes tus ncej, tom qab ntawd koj yuav tsum siv lub koob yees duab ceev. Lo lus "luv" txhais tau tias 1/40 ntawm thib ob lossis tsawg dua. Yog tias koj xav tau thaij duab hauv chav tsaus nti, tom qab ntawd koj kuj yuav tsum kho qhov aperture.
Shutter Ua ntej
Txhua hom tsis siv neeg lub koob yees duab ntawm lub koob yees duab yuav tsis muab koj lub peev xwm los kho qhov ntsuas hluav taws xob ceev tab sis koj nyiam. Yog li no, ntawm kev tshaj lij DSLRs muaj hom "shutter អាទិភាព", uas yog txhais los ntawm cov tsiaj ntawv S lossis Tv. Qhov no txhais tau tias koj tuaj yeem kho tus kheej nkaus xwb qhov ntsuas koj xav tau, thiab lub aperture yuav kho tau nws tus kheej.
Tsis tas li ntawm feem ntau DSLR koob yees duab muaj M, lossis "phau ntawv" hom. Los ntawm xaiv nws, koj kuj tuaj yeem tswj hwm lub shutter ceev. Tab sis dua li nws, koj yuav tsum tau soj ntsuam tus kheej daim duab diaphragm. Txij li cov tsis tau yuav tsum tau kho nyob ntawm qhov hloov me ntsis ntawm lub teeb, cov neeg siv khoom tsis tshua muaj siv hom no.
