Rau cov kws yees duab kev lom zem thiab cov neeg uas tsuas yog xav nkag siab txog qhov pib ntawm kev ua haujlwm ntawm kev thaij duab, lub sijhawm nyuaj tshaj plaws yog xaiv cov aperture. Qhov no yog ib qho ntawm lub ntsiab ntawm lub koob yees duab, uas loj txiav txim siab qhov zoo ntawm cov duab. Tias yog vim li cas nws txoj kev xaiv yuav tsum raug kho nrog kev saib xyuas kom zoo.
Cov Lus Qhia
Kauj ruam 1
Xav txog qhov tseeb tias qhov loj dua qhov chaw xa hluav taws xob, qhov qis dua f (tooj) yuav yog (apertures yog ib txwm qhia los ntawm f tus lej, uas ntau qhov piav qhia qhov txheeb ze lub teeb sib kis). Qhov no feem ntau tsis meej pem rau cov kws txawj thaij duab thiab cov neeg siv ob nqe lus sib hloov. Txawm li cas los xij, lub aperture me qhia tias cov khoom tuaj yeem tuaj yeem ua kom pom tseeb ntawm qhov deb nrog qhov dav dav. Cov tswvyim no tau paub los ntawm lub sijhawm "qhov tob ntawm daim teb".
Kauj ruam 2
Thaum xaiv lub lens, them sai sai rau cov kev qhia tshwj xeeb, uas qhia txog qhov siab tshaj plaws (hauv qee kis qee qhov tsawg kawg nkaus) pub aperture. Cov lo ntsiab muag uas muaj qhov ntau ntawm qhov aperture loj tuaj yeem ua rau muaj kev yoog ntau dua ntawm ob qho kev kaw thiab qhov tob ntawm daim teb. Qhov siab tshaj plaws ntawm qhov siab yog tej zaum qhov tseem ceeb tshaj plaws ntawm tus cwj pwm ntawm lub lens. Ntau zaus, nws tus nqi yog qhia ntawm pob ntawm cov focal ntev.
Kauj ruam 3
Thaum tua duab thaij duab, kev ntaus pob ncaws pob, lossis kev ua yeeb yam, siv lub suab qis qis tshaj qhov ua tau. Qhov no yuav muab lub nrawm kaw nrawm dua lossis, raws li, qhov tob tob ntawm daim teb. Qhov tob ntiav ntawm daim teb rau cov duab thaij duab tuaj yeem pab cais cov ncauj lus ntawm keeb kwm yav dhau los. Rau cov koob yees duab digital, lub apertures loj tau hais qhia lub ntsej muag ntau dua cov duab pom. Qhov no tuaj yeem yog qhov tseem ceeb thaum tua thaum hmo ntuj lossis thaum tsis tshua pom kev.
Kauj ruam 4
Thov nco ntsoov tias txawm tias qhov ntau tshaj ntawm aperture tus nqi tsis tsim nyog, qhov no tsis txhais tau tias xws li lub lens tsis tsim nyog. Lens aberrations feem ntau tsawg dua thaum siv tau siv uas yog 1-2 f-nres qis dua qhov qhib ntau tshaj plaws.
Kauj ruam 5
Lwm yam kev txiav txim siab thaum xaiv suav nrog tus nqi, qhov hnyav, thiab qhov loj me. Lo ntsiab muag nrog ntau dua apertures hnyav dua, hnyav dua, thiab muaj qhov loj dua.
