Dab tsi ua cov zauv ntawm koob yees duab Zoom Lenses?
Lus nug: Cov zauv ntawm cov koob yees duab zoom lo lus txhais li cas? Lub koob yees duab zoom lens txhais yog dab tsi?
A: To taub lub koob yees duab lo ntsiab muag, tshwj xeeb tshaj yog cov koob yees duab zoom lo ntsiab muag, yuav yog ib txoj kev xav. Huag tseeb: Cov zauv teev uas muaj lub koob yees duab zoom zoom zoo li yooj yim. Lub 10X optical zoom lens ntsuas yog zoo nkauj me me, thaum lub 50X optical zoom ntsuas sib npaug zos loj zoom lens. Thiab koj tuaj yeem tua hla ntev dua nrog lub lens loj zoom tshaj lub zoom zoom lens.
Thaum cov lus txhais tau yooj yim txaus rau kev yees duab yooj yim, lawv tsis qhia tag nrho zaj dab neeg. Rau ntau leej photography xav tau, muaj kev nkag siab zoo dua ntawm lub koob yees duab zoom lens yog qhov tseem ceeb. Mus nyeem ntawv kom paub ntau ntxiv txog cov koob yees duab zoom zoom.
Zoom Lens Txhais
Lub lens measurements rau lub koob yees duab digital qhia tau hais tias qhov loj ntawm qhov loj qhov lens tuaj yeem tsim tau. Cov zauv yuav ua rau ruam, tab sis, vim tias qee tus lag luam muaj ntau qhov kev ntsuas, xws li kho qhov muag , cov duab zoom , thiab tag nrho cov zoom. Nco qhov no rau hauv siab thaum ua haujlwm ntawm kev nkag siab lub ntsiab muag lo ntsiab muag:
Optical zoom yog qhov ntsuas tseem ceeb tshaj plaws vim nws ntsuas kev focal ntev ntau ntawm lub lens, raws li qhov tseeb ntawm kev siv lub lens. Raws li lub koob yees duab txav cov iav ntsiab lus hauv lub lens, lub focal ntev rau lub lens hloov, muab nws lub focal ntev ntau yam uas yog qhov kev xav hauv ib lub lens zoom.
Lub digital zoom lens yog lub focal ntev ntev simulation uas lub koob yees duab software tsim. Tsis yog hloov lub cev ntawm lub lens los hloov lub focal ntev ntawm lub lens, lub koob yees duab software loj tuaj rau cov duab raws li tso tawm kom pom hauv LCD npo, tsim lub illusion ntawm lub zoom lens. Vim tias txoj kev ntsuas digital zoom tsuas yog qhov loj hauv daim duab, nws tuaj yeem ua rau tsis tau ntsej muag hauv kev yees duab, yog li siv cov zoom tsis tshwj tsis yog tias koj tsis muaj lwm txoj kev xaiv. Lub koob yees duab smartphone tsuas yog siv cov zis xwb.
Muaj qee cov koob yees duab tseem siv lub sij hawm ua ke kom pom cov lo ntsiab muag, tab sis qhov no yog ib lub sij hawm dhau los. Kev zuag txeeb piv rau lub lens ntsuas ntawm ob qho tib si qhov muag thiab cov yees zoom ntxiv.
To taub Zoom Lens Numbers
Khaws qhov no rau siab thaum ua haujlwm ntawm kev nkag siab lub ntsiab muag lo ntsiab muag: Txhua qhov muag pom kev ntsuas tsis zoo ib yam.
Piv txwv li, ib 10X zoom lens yuav muaj ib zaj duab xis 35mm ntawm 24mm-240mm. Tab sis lwm 10X zoom lens rau lwm lub koob yees duab kuj muaj peev xwm tshaj 35mm-350mm. (Qhov ntau ntawm cov zauv yuav tsum tau muab teev rau hauv cov lus qhia rau cov koob yees duab.) Thawj lub koob yees duab yuav ua kom muaj peev xwm ua kom zoo dua tab sis tsawg dua kev siv xov tooj cua dua ob koob yees duab.
Ib qho lens optical zoom siv tau txhua lub qhov dav dav thiab lub xov tooj focal qhov ntev. Tus kho qhov muag pom txog thaj tsam ntawm ob, tsis hais txog qhov dav lub kaum ntse ntse los yog kev siv lub xov tooj.
Thaum lub 50X optical zoom lens suab zoo li ntsuas tau zoo thiab koj yuav xav tias nws muab cov kev pabcuam zog telephoto, nws yuav tsis muaj peev xwm tua ntawm lub chaw telephoto loj li ntawm 42X optical zoom lens. Yog hais tias qhov 50X optical zoom lens muaj ib qhov chaw dav txog 20 hli, nws qhov chaw tshaj xov tooj yuav yog 1000 hli (20 multiplied by 50). Thiab yog hais tias 42X optical zoom lens muaj ib qhov dav dav txog 25 hli, nws qhov chaw siab tshaj plaws yuav tsum yog 1050 hli (25 multiplied by 42). Nco ntsoov koj them sai sai rau qhov ntsuas qhov muag tsis pom ntawm lub lens tshwj xeeb, tab sis kuj yog qhov chaw siab tshaj plaws.
Nws kuj tseem ceeb teev cia tias qee qhov kev ntsuam xyuas qhov muag tsis pom kev yog tsis muaj cov kab zauv. Koj yuav pom ib qho optical zoom ntawm 4.2X nrog lub koob yees duab, xws li rau 24-100mm focal ntev hauv ib qho lens optical zoom.
Kom tau nkag siab zoo dua ntawm cov ntsiab muag qhov muag tsis pom hauv cov koob yees duab digital, sim nyeem "Understand the Zoom Lens" .
Nrhiav dua cov lus teb rau cov lus nug hauv koob yees duab rau ntawm lub koob yees duab FAQ.