Yuav Ua Li Cas Xaiv Lub Lens Zoo Tshaj Plaws Rau Koj Lub Koob Yees Duab Ruaj Ntseg?

ib ,Hom Lub Koob Yees Duab Ruaj Ntseg:

Cov tsom iav ntawm lub koob yees duab kev ruaj ntseg muaj ntau hom sib txawv, txhua lub tsim los kom haum rau cov kev xav tau tshwj xeeb ntawm kev saib xyuas. Kev nkag siab txog cov hom tsom iav muaj tuaj yeem pab koj xaiv qhov zoo tshaj plaws rau koj lub koob yees duab kev ruaj ntseg. Nov yog cov hom tsom iav uas feem ntau sivcov koob yees duab kev ruaj ntseg:

1,Lens ruaj khov: Lub lens ruaj khov muaj ib qho ntev focal thiab thaj chaw pom kev, uas tsis tuaj yeem hloov kho. Nws yog ib qho kev xaiv pheej yig uas tsim nyog rau kev saib xyuas ib cheeb tsam tshwj xeeb yam tsis tas yuav hloov kho ntau zaus. Cov lens ruaj khov muaj nyob rau hauv ntau qhov ntev focal, cia koj xaiv thaj chaw pom kev xav tau.

2,Lens Varifocal: Lub lens varifocal muaj qhov ntev focal hloov tau, cia koj hloov qhov pom ntawm tes. Nws muab kev ywj pheej hauv kev kho qhov zoom thiab zoo tagnrho rau cov xwm txheej uas thaj chaw saib xyuas yuav hloov pauv lossis xav tau ntau qib ntawm cov ntsiab lus. Varifocal lenses feem ntau siv rau hauv cov xwm txheej uas xav tau kev ua tau ntau yam, xws li kev saib xyuas sab nraum zoov.

3,Lub Lens Zoom:Lub lens zoom muab lub peev xwm los kho qhov ntev ntawm lub lens thiab thaj chaw pom kev deb. Nws tso cai rau ob qho tib si optical zoom thiab digital zoom. Optical zoom tswj qhov zoo ntawm daim duab los ntawm kev kho cov ntsiab lus ntawm lub lens, thaum digital zoom ua kom daim duab loj dua digitally, ua rau muaj peev xwm poob qhov zoo ntawm daim duab. Zoom lens feem ntau siv rau hauv cov ntawv thov uas kev saib xyuas deb thiab lub peev xwm los ntes cov ntsiab lus zoo yog qhov tseem ceeb, xws li hauv thaj chaw loj hauv tsev lossis sab nraum zoov.

4,Lub Lens Dav Dav: Lub lens dav dav muaj qhov ntev focal luv dua, ua rau pom tau dav dua. Nws tsim nyog rau kev saib xyuas thaj chaw loj lossis qhov chaw qhib uas yuav tsum tau thaij duab dav dav. Cov lens dav dav feem ntau siv rau hauv cov xwm txheej saib xyuas xws li chaw nres tsheb, tsev rau khoom, lossis kev saib xyuas sab nraum zoov.

5,Lens Telephoto: Lub lens telephoto muaj qhov ntev focal ntev dua, muab qhov pom nqaim dua thiab qhov loj dua. Nws zoo tagnrho rau kev saib xyuas ntev lossis cov xwm txheej uas kev ntes cov ntsiab lus tshwj xeeb los ntawm qhov deb yog qhov tseem ceeb. Cov lens telephoto feem ntau siv rau cov ntawv thov xws li kev lees paub daim ntawv tsav tsheb, kev txheeb xyuas lub ntsej muag, lossis kev saib xyuas cov ntsiab lus tseem ceeb los ntawm qhov deb.

6,Lub Lens Pinhole:Lub lens pinhole yog ib lub lens tshwj xeeb uas me me thiab zais cia. Nws yog tsim los kom zais rau hauv cov khoom lossis qhov chaw, tso cai rau kev saib xyuas zais cia. Cov lens pinhole feem ntau siv rau hauv cov xwm txheej uas lub koob yees duab yuav tsum tau zais lossis zais cia, xws li hauv ATMs, qhov rooj peepholes, lossis kev ua haujlwm saib xyuas zais cia.

二,Yuav Ua Li Cas Xaiv Lub Lens Zoo Tshaj Plaws Rau Koj Lub Koob Yees Duab Ruaj Ntseg?

Xaiv lub lens zoo tshaj plaws rau koj lub koob yees duab kev ruaj ntseg yog ib kauj ruam tseem ceeb hauv kev ua kom muaj kev ua haujlwm zoo tshaj plaws thiab thaij cov yeeb yaj kiab zoo. Nov yog qee yam uas yuav tsum xav txog thaum xaiv lub lens:

Hom Lub Koob Yees Duab:Txheeb xyuas seb koj muaj lossis npaj yuav hom koob yees duab kev ruaj ntseg hom twg. Cov hom koob yees duab sib txawv, xws li bullet, dome, lossis PTZ (pan-tilt-zoom), tej zaum yuav xav tau cov hom lens lossis qhov loj me tshwj xeeb.

Qhov Ntev FocalQhov ntev ntawm lub focal txiav txim siab qhov pom thiab qib ntawm kev zoom. Nws yog ntsuas hauv millimeters (mm). Xaiv qhov ntev ntawm lub focal uas haum rau koj cov kev xav tau tshwj xeeb. Nov yog qee qhov kev xaiv uas feem ntau siv:

Lub Lens Dav Dav(2.8mm txog 8mm): Muab qhov pom dav dua, tsim nyog rau kev npog thaj chaw loj lossis saib xyuas qhov chaw dav.

Lens Txheem (8mm txog 12mm): Muab qhov pom kev sib npaug uas haum rau kev siv saib xyuas dav dav.

Lens Telephoto (12mm thiab siab dua): Muab qhov pom nqaim dua tab sis muaj peev xwm zoom tau zoo dua rau kev saib xyuas ntev lossis cov duab ze ze.

Teb Pom (FOV)Xav txog thaj chaw uas koj xav saib xyuas thiab qib ntawm cov ntsiab lus xav tau. Lub zeem muag dav dua yog qhov pab tau rau cov chaw qhib loj, thaum lub FOV nqaim dua yog qhov zoo dua rau cov chaw tsom kwm tshwj xeeb uas xav tau kev saib xyuas ze dua.

Qhov qhibLub qhov (aperture) txiav txim siab seb lub lens lub peev xwm los sau lub teeb. Nws yog sawv cev los ntawm tus lej f (piv txwv li, f/1.4, f/2.8). Tus lej f qis dua qhia txog lub qhov (aperture) dav dua, uas ua rau lub teeb nkag mus rau hauv lub lens ntau dua. Lub qhov (aperture) dav dua yog qhov zoo rau cov xwm txheej uas muaj teeb tsawg lossis rau kev thaij duab meej hauv qhov tsaus ntuj.

Kev Sib Txuas Lus ntawm Duab Sensor: Xyuas kom tseeb tias lub lens sib xws nrog qhov loj ntawm lub sensor duab ntawm koj lub koob yees duab. Qhov loj ntawm lub sensor duab feem ntau suav nrog 1/3″, 1/2.7″, thiab 1/2.5″. Kev siv lub lens tsim rau qhov loj ntawm lub sensor kom raug pab tswj tau qhov zoo ntawm daim duab thiab zam kev vignetting lossis kev cuam tshuam ntawm daim duab.

Lens Mountt: Xyuas seb hom lens mount twg uas koj lub koob yees duab xav tau. Cov hom mount uas siv ntau suav nrog CS mount thiab C mount. Xyuas kom tseeb tias lub lens uas koj xaiv phim hom mount ntawm lub koob yees duab.

Varifocal piv rau Fixed Lens:Cov tsom iav Varifocal tso cai rau koj kho qhov ntev ntawm lub lens ntawm tes, ua rau koj hloov tau qhov pom kev raws li qhov xav tau. Cov tsom iav ruaj khov muaj qhov ntev ntawm lub lens uas tau teem tseg ua ntej thiab muab qhov pom kev ruaj khov. Xaiv hom tsom iav uas tsim nyog raws li koj xav tau.

Nyiaj Txiag:Xav txog koj cov peev nyiaj thaum xaiv lub lens. Cov lens zoo uas muaj cov yam ntxwv siab heev yuav kim dua tab sis tuaj yeem muab cov duab zoo dua thiab ruaj khov dua.

Chaw Tsim Khoom thiab Kev Tshuaj Xyuas:Tshawb nrhiav cov chaw tsim khoom uas muaj npe nrov uas tshwj xeeb hauv kev tsim cov koob yees duab kev ruaj ntseg. Nyeem cov kev tshuaj xyuas ntawm cov neeg siv khoom thiab nrhiav cov lus qhia kom paub tseeb tias koj xaiv cov khoom tsim nyog thiab muaj npe nrov.

三Xaiv Lub Lens Rau Sab Hauv Tsev vs. Sab Nraud: Qhov Txawv Yog Dab Tsi?

Thaum xaiv lub lens rau kev soj ntsuam sab hauv tsev lossis sab nraum zoov, muaj ob peb qhov sib txawv tseem ceeb uas yuav tsum xav txog vim yog cov yam ntxwv sib txawv ntawm cov chaw no. Nov yog yam koj yuav tsum paub:

Cov xwm txheej teeb pom kev zoo:Feem ntau cov chaw sab nraum zoov muaj ntau yam teeb pom kev sib txawv, suav nrog lub hnub ci ntsa iab, duab ntxoov ntxoo, thiab qhov xwm txheej tsaus ntuj. Cov chaw sab hauv tsev, ntawm qhov tod tes, feem ntau muaj cov xwm txheej teeb pom kev zoo tswj tau zoo dua nrog lub teeb pom kev zoo sib xws. Yog li ntawd, kev xaiv lub lens yuav tsum xav txog cov teeb meem teeb pom kev zoo ntawm txhua qhov chaw.

Sab nraum zoov:Xaiv lub lens uas muaj qhov aperture dav (f-number qis) kom tau txais lub teeb ntau dua thaum muaj teeb tsawg. Qhov no ua kom pom kev zoo dua thiab zoo dua thaum tsaus ntuj, kaj ntug, lossis hmo ntuj. Tsis tas li ntawd, cov lens uas muaj peev xwm ua haujlwm tau zoo tuaj yeem tswj tau qhov sib txawv ntawm lub hnub ci thiab thaj chaw ntxoov ntxoo tau zoo.

Sab Hauv Tsev: Vim tias feem ntau cov chaw nyob hauv tsev muaj teeb pom kev zoo tas li, cov iav uas muaj qhov qhib nruab nrab yuav txaus. Lub iav uas muaj tus lej f siab dua me ntsis tseem tuaj yeem xa cov duab zoo hauv cov chaw sab hauv tsev yam tsis tas yuav muaj qhov qhib dav.

Thaj Chaw Saib:Qhov chaw uas yuav tsum tau saib yuav txawv raws li qhov loj thiab qhov teeb tsa ntawm thaj chaw saib xyuas.

Sab Nraum Zoov: Feem ntau cov chaw sab nraum zoov xav tau qhov pom dav dua kom saib tau cov chaw loj dua zoo. Cov iav dav dav feem ntau siv los thaij duab dav dua, tshwj xeeb tshaj yog rau cov chaw qhib xws li chaw nres tsheb lossis sab nraum zoov.

Sab Hauv Tsev: Qhov pom kev sab hauv tsev yuav txawv nyob ntawm thaj chaw tshwj xeeb uas raug saib xyuas. Qee zaum, lub lens dav dav yuav tsim nyog rau kev npog chav loj dua lossis txoj kev hauv tsev. Txawm li cas los xij, nyob rau hauv qhov chaw nqaim dua lossis qhov twg xav tau kev saib xyuas ntxaws ntxaws, lub lens uas muaj qhov pom kev nqaim dua lossis muaj peev xwm hloov kho qhov ntev ntawm lub focal (varifocal lens) yuav zoo dua.

Kev Tiv Thaiv Huab CuaCov koob yees duab saib xyuas sab nraum zoov thiab cov iav tsom iav yuav tsum tsim los kom tiv taus huab cua hnyav, xws li nag, daus, hmoov av, lossis qhov kub thiab txias heev. Nws yog ib qho tseem ceeb uas yuav tsum xaiv cov iav tsom iav uas tsim tshwj xeeb rau kev siv sab nraum zoov, uas feem ntau muaj cov yam ntxwv tiv taus huab cua xws li lub thawv kaw kom tiv thaiv cov dej noo thiab cov khib nyiab.

Kev Tiv Thaiv Kev Ua Phem:Nyob rau sab nraum zoov, muaj kev pheej hmoo ntau dua ntawm kev ua puas tsuaj lossis kev cuam tshuam. Xav txog cov iav uas muaj cov yam ntxwv tiv thaiv xws li cov plhaub lossis lub domes uas tiv taus kev cuam tshuam kom tiv thaiv kev puas tsuaj thiab xyuas kom meej tias lub koob yees duab ua haujlwm thiab qhov zoo ntawm cov duab tsis raug cuam tshuam.

Kev Sib Txuas Lus IR:Yog tias koj lub tshuab saib xyuas muaj lub teeb infrared (IR) rau kev pom kev hmo ntuj, xyuas kom meej tias lub lens sib xws nrog lub teeb IR. Qee lub lens yuav muaj lub lim IR-cut los txhim kho qhov zoo ntawm cov duab thaum nruab hnub thiab tso cai rau kev pom kev zoo IR thaum hmo ntuj.