Cov tsom iav Varifocal yog ib hom tsom iav uas feem ntau siv rau hauv cov koob yees duab kaw-circuit (CCTV). Tsis zoo li cov tsom iav qhov ntev uas ruaj khov, uas muaj qhov ntev uas tau teem tseg ua ntej uas tsis tuaj yeem hloov kho tau, cov tsom iav varifocal muab qhov ntev uas hloov kho tau hauv qhov ntau thiab tsawg.
Qhov zoo tshaj plaws ntawm cov iav tsom iav varifocal yog lawv qhov yooj ywm hauv kev kho qhov pom ntawm lub koob yees duab (FOV) thiab qib zoom. Los ntawm kev hloov qhov ntev ntawm lub lens, lub lens tso cai rau koj hloov lub kaum sab xis ntawm qhov pom thiab zoom rau hauv lossis tawm raws li qhov xav tau.
Qhov feature no yog qhov tshwj xeeb tshaj yog rau cov kev siv saib xyuas uas lub koob yees duab yuav tsum tau saib xyuas ntau thaj chaw lossis cov khoom ntawm ntau qhov deb sib txawv.
Cov tsom iav Varifocalfeem ntau piav qhia siv ob tus lej, xws li 2.8-12mm lossis 5-50mm. Tus lej thawj zaug sawv cev rau qhov ntev focal luv tshaj plaws ntawm lub lens, muab qhov pom dav dua, thaum tus lej thib ob sawv cev rau qhov ntev focal ntev tshaj plaws, ua rau muaj qhov pom nqaim dua nrog kev zoom ntau dua.
Los ntawm kev kho qhov ntev ntawm lub lens hauv qhov ntau no, koj tuaj yeem kho qhov pom ntawm lub koob yees duab kom haum rau cov kev xav tau tshwj xeeb.
Lub focal ntev ntawm varifocal lens
Nws tsim nyog sau tseg tias kev kho qhov ntev ntawm lub lens varifocal yuav tsum tau siv tes los kho, los ntawm kev tig lub nplhaib ntawm lub lens lossis los ntawm kev siv lub tshuab uas tswj hwm los ntawm deb. Qhov no tso cai rau kev kho kom haum rau qhov xav tau kev saib xyuas hloov pauv.
Qhov sib txawv tseem ceeb ntawm cov iav varifocal thiab cov iav fixed hauv CCTV lub koob yees duab yog lawv lub peev xwm los kho qhov ntev ntawm lub focal thiab thaj chaw pom.
Qhov Ntev Focal:
Cov iav tsom iav ruaj khov muaj qhov ntev focal tshwj xeeb, tsis tuaj yeem hloov kho tau. Qhov no txhais tau tias thaum twg ntsia tau lawm, lub koob yees duab lub zeem muag thiab qib zoom yuav tsis hloov pauv. Ntawm qhov tod tes, cov iav tsom iav varifocal muaj ntau yam qhov ntev focal hloov kho tau, ua rau muaj kev ywj pheej hauv kev hloov lub koob yees duab lub zeem muag thiab qib zoom raws li qhov xav tau.
Thaj Chaw Saib:
Nrog lub lens ruaj khov, qhov pom kev tau txiav txim siab ua ntej thiab tsis tuaj yeem hloov pauv yam tsis tau hloov lub lens.Cov tsom iav Varifocal, ntawm qhov tod tes, muab qhov yooj ywm los kho lub lens kom ua tiav qhov pom dav dua lossis nqaim dua, nyob ntawm qhov yuav tsum tau saib xyuas.
Qib Zoom:
Cov iav tsom iav ruaj khov tsis muaj qhov zoom, vim lawv qhov ntev ntawm lub lens tseem ruaj khov. Txawm li cas los xij, cov iav tsom iav varifocal tso cai rau kev zoom rau hauv lossis tawm los ntawm kev kho qhov ntev ntawm lub lens hauv qhov ntau thiab tsawg uas tau teev tseg. Qhov no muaj txiaj ntsig zoo thaum koj xav tau tsom mus rau cov ntsiab lus tshwj xeeb lossis cov khoom ntawm qhov deb sib txawv.
Qhov kev xaiv ntawm cov iav varifocal thiab cov iav fixed nyob ntawm qhov xav tau kev saib xyuas tshwj xeeb ntawm daim ntawv thov. Cov iav fixed yog qhov tsim nyog thaum lub zeem muag tas li thiab qib zoom txaus, thiab tsis tas yuav tsum tau kho qhov pom ntawm lub koob yees duab.
Cov tsom iav Varifocalmuaj ntau yam siv tau thiab muaj txiaj ntsig zoo dua thaum xav tau kev ywj pheej hauv kev pom thiab kev zoom, uas tso cai rau kev hloov kho rau ntau yam xwm txheej saib xyuas.
Lub sijhawm tshaj tawm: Lub Yim Hli-09-2023
