Zoom yog lub peev xwm uas cov lo ntsiab muag lo ntsiab muag yuav tsum hloov lawv tus kheej focal ntev thiaj li yuav kho qhov ntsuas ntawm cov khoom uas tau yees duab. Cov cuab yeej lens nthuav tawm tso cai rau koj kom zoom hauv lossis, qhov sib txawv, zoom tawm ntawm daim duab yam tsis hloov lub koob yees duab nws tus kheej hauv txhua txoj kev. Txhawm rau hloov qhov loj ntawm ib qho khoom hauv daim duab, ib hom kev hloov kho lub lens yog ua hauv lub lens. Qhov nthuav tawm permutation yog lub luag haujlwm rau zooming.
Zoom varieties
optical zoom yog dab tsi? Lub tswv yim implies ib tug rearrangement ntawm lo ntsiab muag nyob rau hauv lub lens. Nyob rau hauv sib piv rau lub optical zoom, kuj muaj ib tug digital. Digital zoom txhais li cas? Cov no yog cov kev hloov pauv ntawm qhov ntsuas ntawm qhov chaw raug tua, tab sis tsis muaj kev koom tes ntawm optics. Peb tuaj yeem hais tias qhov no yog ib qho yooj yim framing ntawm cov duab thiab nws cov digital enlargement.
Hauv kev xyaum, qhov sib txawv tau hnov zoom ntawm digital thiab optical zoom ntawm lub koob yees duab. Qhov no tuaj yeem pom thaum sib piv, txij li qhov kho qhov muag zoom tso cai rau koj thaij duab lossis yeeb yaj kiab zoo thiab zoo, tab sis qhov zoom digital, hmoov tsis zoo, ua rau "tsis nrov" thiab cov duab tsis zoo.
Kev nthuav dav thiab zoom yog tib yam?
Nyob rau hauv pob nyiaj siv khoom siv yees duab amateur, zoom yogntau ntau. Piv txwv li, 4x zoom qhia tias lub koob yees duab tuaj yeem hloov nws tus kheej focal ntev los ntawm 4x. Hauv cov cuab yeej kev tshaj lij, qhov kev nthuav dav tsis tau qhia, tab sis tsuas yog qhov tsawg kawg nkaus thiab siab tshaj plaws focal length marks tau sau tseg. Cov koob yees duab neeg siv tam sim no feem ntau muab cov neeg siv zoom ntau dua li cov koob yees duab tshaj lij.
Ultrazoom yog dab tsi?
Amateur thev naus laus zis tseem muaj cov koob yees duab nrog ultrazooms uas tsim cov duab kaum lossis txawm nees nkaum-fold. Yog tias koj xav tau cov duab zoo txawm tias muaj focal zoom, nws yog qhov zoo tshaj plaws los tua nrog ultrazoom nyob rau hauv lub teeb ci los yog los ntawm lub tripod. Tam sim no koj paub tias qhov no yog lub koob yees duab zoom.
Qhov zoo thiab qhov tsis zoo ntawm qhov zoom yog dab tsi?
Optical zoom yog qhov tseem ceeb rau cov tib neeg uas xav thaij duab zoo nkauj, nkig, tua ntev, thiab tej zaum luam tawm lawv tus kheej qhov screen dav. Nws yog ib nqi sau cia hais tias lub lag luam ntawm lub optical zoom ntawm lub lens yog indistinguishable los ntawm lub lag luam ntawm lub optical zoom ntawm lub koob yees duab. Qhov no txhais li cas? Lub zoom nqa cov duab los ze zog los ntawm ob peb zaug, thaum lub sij hawm raug ntawm tus ncej thiab nws focal ntev yog hloov nrog txhua nias ntawm lub zoom tswj khawm. Tam sim no muaj cov koob yees duab zoo nrog nees nkaum-zoom uas tso cai rau koj los yees duab ya paws lossis lwm yam yam tsis muaj qhov tsis zoo.
Cov txiaj ntsig kho qhov muag zoom:
- Kev ntse heev, kev tsim cov xim zoo txawm tias nyob rau ntawm qhov loj ntawm tus ncej, cov ntsiab lus me me yeej ib txwm pom, tsis muaj qhov muag plooj hlo li.
- Qhov kev daws teeb meem ntawm cov duab tsis hloov pauv thaum zooming, uas yog qhov tseem ceeb heev rau kev luam tawm cov duab tom qab hauv qhov zoo.
- Tag nrho cov duab yog coj ntawm 300 dpi. Qhov no yog txaus los tsim ib daim ntawv qhia hnub zoo, ib daim ntawv loj loj lossis ib daim ntawv loj loj. Qhov zoo ntawm daim duab tsis hloov hlo li.
Neegative moments:
- Techniques nrog zoom zoom yog kim. Ntau lub tuam txhab tsim khoom lag luam tso cov koob yees duab ua cov cuab yeej tshaj lij, uas txhais tau hais tias nws muaj teeb meem los yuav lub koob yees duab zoo li no hauv lub khw tsis tu ncua.
- Optical zoom tsis tau qhib cais los ntawm digital zoom, uas ua rau nws nyuaj rau kev ua haujlwm nrog cov khoom siv.
Qhov zoo thiab qhov tsis zoo ntawm digital zoom yog dab tsi?
Digital zoom yog qhov zoo tshaj plaws kev lag luam rau ntau lub tuam txhab vim nws tsis tshua zoom rau ntawm tus ncej, nws ncab nws tawm. Thaum lub sijhawm no, thaj tsam ntawm cov duab uas koj xav kom zoom yog siv, thiab cov pixels tsuas yog ncab mus rau qhov deb koj xav tau. Koj ntaus lub shutter thiab tau txais qhov muag plooj, daim duab tsis zoo tshaj qhov koj xav tau ua ntej. Yog lawm, cov pixels "ntev" los ntawm qhov kev ncua deb koj teev, thiab qhov no yog digital zoom. Tsis yog txhua yam phem npaum li nws zoo li.
txiaj ntsig:
- Qhov zoo ntawm hom zoom no txaus los ua cov duab luam tau zoo. Koj yuav tau txais qhov chaw nyob ib ncig ntawm 72 ppi lossis hauv lwm lo lus 72 pixels ib nti, uas txaus rau blog lossis social network.
- Tus nqi ntawm cov khoom siv yees duab nrog lub zoom yog qis dua rau cov koob yees duab nrog "tso" optics.
Neegative moments:
- Qhov zoo ntawm daim duab yog qhov tsawg, thiab rau cov kws tshaj lij, cov txheej txheem nrog zoom zoom tsis muaj txiaj ntsig kiag li.
- Digital zoom, vim muaj kev tshaj tawm zoo, raug nqi ntau dua li qhov yuav tsum tau ua raws li kev qhia tshwj xeeb.
Qhov tshwm sim yog dab tsi?
Thaum yuav khoom siv yees duab, koj yuav tsum paub meej txog lub hom phiaj uas koj xav tau. Puas yog koj yuav siv koj tus kheej cov duab ua kev tshaj tawm, tshaj tawm hauv cov ntawv xov xwm, tsim cov ntawv qhia los ntawm lawv, lossis tsuas yog khwv tau nyiaj los ntawm lawv? Tom qab ntawd qhov zoo tshaj plaws thiab pheej yig ntaus ntawv nrog optical zoom yog qhov tseem ceeb rau koj. Hauv cov xwm txheej zoo li no, tsis txhob ua qhov tseem ceeb ntawm qhov muaj digital zoom nyob rau hauv txhua rooj plaub, vim tias nws yog qhov chaw muaj zog, uas txhais tau hais tias qhov kho qhov muag yuav "muted". Yog tias koj xav tau, ces xyuas ua ntej yuav yog tias koj tuaj yeem tua cov digital zoom thiab siv qhov kho qhov muag.
Koj puas tsuas xav tau lub koob yees duab los thaij duab tsev neeg thiab yeeb yaj kiab? Tom qab ntawd koj tsis xav tau cov cuab yeej yees duab tshaj lij thiab koj tsis tuaj yeem saib cov khoom siv kim nrog optical zoom, digital yuav txaus rau koj. Nco ntsoov xyuam xim rau tus nqi ntawm cov cuab yeej, saib cov peev nyiaj versions ua ntej, vim tias ntawm lawv muaj ntau yam khoom siv zoo, me ntsis "txhim kho" los ntawm kev tshaj tawm.
