Optical Zoom Vs. Cov Zoom
Cov kws kho mob xav sim ua tej yam yooj yim rau koj thaum koj nyob nraum kav khw rau digital lub koob yees duab , tshwj xeeb los ntawm cov ntsiab lus ntawm lawv cov qauv, xws li cov nqi loj loj thiab tus loj LCD loj npaum li cas.
Txawm li cas los xij, xws li cov lej tsis qhia txhua zaj dab neeg, tshwj xeeb tshaj yog thaum saib zoom lo ntsiab muag ntawm lub koob yees duab digital. Manufacturers ntsuas kev muaj peev xwm ntawm cov koob yees duab digital hauv ob lub qauv: Optical zoom thiab digital zoom. Nws yog ib qho tseem ceeb kom nkag siab lub lens zoom, vim tias ob hom kev zom yog txawv ntawm ib leeg. Nyob rau hauv kev sib ntaus sib tua ntawm optical zoom thiab digital zoom, tsuas yog ib qho - optical zoom - yog li tseem pab tau rau kev pab txog.
Nrog cov koob yees duab digital feem ntau, lub lens zoom tawm sab nraud thaum siv, txuas los ntawm lub cev yees duab. Ib co digital koob yees duab, tiam sis, tsim qhov zoom thaum kho lub lens xwb hauv lub cev lub koob yees duab . Mus nyeem ntawv kom paub ntau ntxiv uas yuav pab tau koj to taub lub koob yees duab zoom zoom zoo dua thiab uas yuav pab tau koj xaus qhov kev sib cav ntawm optical zoom thiab digital zoom!
Optical Zoom
Optical zoom ntsuas qhov tseeb nce hauv focal ntev ntawm lub lens. Focal ntev yog qhov kev ncua deb ntawm nruab nrab ntawm lub lens thiab cov duab sensor. Los ntawm tsiv lub lens deb ntawm cov duab sensor hauv lub cev lub koob yees duab, lub zoom nce ntxiv vim hais tias ib feem me me ntawm lub scene ntaus cov duab sensor, uas ua rau magnification.
Thaum siv optical zoom, qee qhov digital koob yees duab yuav muaj lub zoom zoom, lub ntsiab lus koj tuaj yeem txwv ntawm txhua qhov taw qhia raws tag nrho cov zoom rau lub zoom zoom. Qee cov digital koob yees duab yuav siv qhov chaw nres mus raws li qhov ntev ntawm qhov zoom, feem ntau txwv koj mus rau plaub thiab xya ib nrab zoom positions.
Cov Zoom
Qhov kev ntsuas ntawm digital zoom rau ntawm cov koob yees duab digital, kom muab nws tawg, tsis muaj nqis nyob rau hauv feem ntau shooting xwm txheej. Cov digital zoom yog ib qho technology uas cov koob yees duab tua cov yees duab thiab ces cov qoob loo thiab loj hlob tuaj mus tsim ib qho kev tsim duab zoo nkauj. Tus txheej txheem no yuav tsum tau loj hlob lossis tshem tawm tus neeg pixels, uas yuav ua rau cov duab zoo degradation.
Feem ntau lub sijhawm koj tuaj yeem ua haujlwm sib npaug zos rau digital zoom nrog photo-editing software hauv koj lub computer tom qab koj tua duab. Yog tias koj tsis muaj sij hawm los sis nkag mus rau kev tsim kho software, koj siv tau cov digital zoom tua ntawm kev sib kho siab thiab mam li tsim kom muaj kev sib tw tsim tawm los ntawm kev tshem pixels thiab cropping tus yees duab qis qis dua uas tseem ua tau raws li koj cov luam ntawv xav tau. Obviously, cov kev siv ntawm digital zoom yog siv tau rau qee yam.
To taub Zoom ntsuas
Thaum saib cov lus qhia rau cov koob yees duab digital, cov kev ntsuas qhov muag thiab cov yees digital tau pom zoo li tus nab npawb thiab tus "X," xws li 3 X lossis 10X. Ib tug zauv loj qhia tias muaj peev xwm ua tau zoo dua ntxiv.
Nco ntsoov tias tsis yog txhua lub koob yees duab "10X" optical zoom ntsuas yog tib yam. Manufacturers ntsuas qhov optical zoom ntawm ib qho loj ntawm lub lens 'muaj peev xwm mus rau lwm yam. Hauv lwm lo lus, qhov "twv" yog qhov txawv ntawm qhov tsawg tshaj plaws thiab qhov dav focal ntev ntsuas ntawm lub lens. Piv txwv li, yog tias tus 10X optical zoom lens ntawm lub koob yees duab digital muaj tsawg kawg nkaus focal ntev ntawm 35 hli, lub koob yees duab yuav muaj qhov ntev tshaj 350mm. Txawm li cas los xij, yog tias cov koob yees duab digital muaj qee cov peev xwm ntau ntxiv thiab muaj qhov tsawg tshaj 28mm qhov sib npaug, ces tus 10X optical zoom yuav tsuas muaj lub siab tshaj plaws focal ntev ntawm 280mm.
Lub focal ntev yuav tsum tau muab teev rau hauv lub koob yees duab cov lus qhia, feem ntau zoo ib yam li "35mm zaj duab xis sib npaug: 28mm-280mm." Feem ntau, ib qho kev ntsuas 50mm lens raug xam raws li "normal", tsis muaj kev loj hlob thiab tsis muaj dav-lub Thaum koj tab tom sim los sib piv tag nrho ntawm ntau qhov lens, nws tseem ceeb heev uas koj muab piv rau 35mm zaj duab xis sib npaug ntawm lens rau lens. yuav yog me ntsis ruam tag yog tias koj tsis saib tus nab npawb zoo.
Sib Hloov Lauj Luam
Cov koob yees duab ntawm cov tub ntxhais kawm tshiab thiab cov neeg siv nruab nrab feem ntau tsuas yog muab ib qho lens built-in. Feem ntau cov SLR (DSLR) koob yees duab, tiam sis, yuav ua rau siv cov lenses sib pauv. Nrog ib lub DSLR, yog tias koj lub lens thawj tsis muaj qhov dav-angle lossis zoom peev xwm uas koj xav tau, koj tuaj yeem muas cov lo ntsiab muag ntxiv uas muaj kev xaiv ntau zoom lossis zoo dua.
DSLR koob yees duab yog kim kim tshaj li tus taw tes-thiab-tua qauv, thiab lawv feem ntau yog tsom rau cov pab cuam los sis cov kws tshaj li qub.
Feem ntau cov DSLR lo ntsiab muag yuav tsis suav tus "X" tus nab npawb rau kev ntsuas. Xwb, qhov ntev ntawm lub focal yuav tsuas sau tau, feem ntau yog ib feem ntawm lub npe ntawm DSLR lens. LI (digital interchangeable lens) koob yees duab, uas yog daim iav tsom iav siv lens cam (ILC), kuj siv lo ntsiab muag uas tau teev tseg los ntawm lawv cov focal ntev, tsis yog X Zoom tooj.
Nrog lub lens koob yees duab interchangeable, koj tuaj yeem suav qhov ntsuas qhov muag ntsuas koj tus kheej los ntawm kev siv cov qauv zauv yooj yim. Siv lub siab ntev focal ntev uas lub lens lem tau hloov tau, hais 300 hli, thiab faib nws los ntawm qhov ntev focal ntev, hais 50 hli. Hauv qhov ua piv txwv no, qhov ntsuas qhov zoo tshaj qhov ntsuas yuav yog 6X.
Ib Qho Zuj Zus Lens Cov Nres
Txawm hais tias xaiv lub koob yees duab taw tes-thiab-tua nrog lub lens optical zoom lens yog txaus rau ntau yam kev pab txog, nws qee zaum nthuav dav rau ob peb tus me me.
- Lub suab nrov. Qee cov pib-tshiab, pheej yig koob yees duab raug kev txom nyem los ntawm cov duab qis dua vim suab nrov thaum lub lens mus txuas rau lub siab tshaj plaws zoom peev xwm. Cov suab nrov digital yog ib txheej ntawm pixels pixels uas tsis sau kom raug, feem ntau tshwm ua cov xim liab hauv duab.
- Pincushioning. Zoom zoom feem ntau kuj ua rau pincushioning, uas yog ib distortion qhov chaw uas sab laug thiab txoj cai ntawm tus yees duab tshwm. Kab rov tav ua rau me ntsis curved mus rau nruab nrab ntawm tus ncej. Ntxiv dua thiab, qhov teeb meem no feem ntau yog txwv tsis pub pib, tsis tshua muaj koob yees duab nrog zoom zoom lenses.
- Lub sij hawm luv lo lus teb shutter. Thaum siv lub siab tshaj plaws zoom magnification, lub sij hawm shutter sij hawm qeeb qeeb, uas yuav ua rau cov duab zim zuag. Koj tseem tuaj yeem ploj mus tsis tau ib daim duab vim tsis muaj lus teb rau qeeb qeeb . Nws tsuas siv cov koob yees duab ntev kom siab rau cov duab ntawm qhov chaw siab tshaj plaws, uas piav qhia txog lub caij nyoog qeeb zog ntawm qhov teeb meem. Cov teeb meem zoo li no tau nce siab thaum shooting rau siab tshaj plaws nyob rau hauv tsawg lub teeb .
- Yuav tsum muaj ib lub kos. Siv lub zoom zoom lens yuav ua rau muaj lub koob yees duab tuav ntau dua. Qee cov koob yees duab tau kho cov teebmeem no los ntawm kev tiv thaiv duab . Koj kuj tuaj yeem siv lub thau rau kev tiv thaiv kom tsis pom duab los ntawm lub koob yees duab co.
Tsis txhob & Tsis txhob poobsiab
Thaum highlighting cov specifications ntawm lawv cov khoom, qee cov manufacturers yuav muab cov kev ntsuam digital zoom thiab kho qhov muag, cia lawv ua yeeb yaj kiab loj ua ke nyob rau sab xub ntiag ntawm lub thawv.
Koj, tiam sis, yuav tsum tau saib nkaus xwb nyob rau ntawm qhov chaw cim suab paj nruag, uas tej zaum yuav tau teev nyob rau hauv kaum tawm nyob rau sab nraum qab ntawm lub thawv, nrog rau tus tswv tsev ntawm lwm tus lej specification. Koj yuav tau ua me ntsis searching kom pom qhov ntsuas qhov muag pom ntawm ib qho qauv.
Nyob rau hauv cov ntaub ntawv ntawm digital koob yees duab zoom lo ntsiab muag, nws them rau nyeem cov ntawv nplua. Nkag siab lub lens zoom, thiab koj mam li ua rau feem ntau ntawm koj cov koob yees duab digital.