I-Optical Zoom Vs. I-Zoom ye-Digital
Abakhiqizi bathanda ukwenza izinto zibe lula kuwe uma uthengisa ikhamera yedijithali , ikakhulukazi ngokugqamisa izilinganiso ezithile zamamodeli abo, njengamanani amakhulu we-megapixel namasayizi amakhulu e-LCD esikrinini.
Kodwa-ke, izinombolo ezinjalo azikhulumi ngaso sonke isikhathi indaba, ikakhulukazi uma ubheka ama-lenses okulonda ekhamera yedijithali. Abakhiqizi balinganisa amakhono okuzondeza amakhamera edijithali ekulungiselelweni okubili: Ukusondeza okubonakalayo ngokusondeza kwe-digital. Kubalulekile ukuqonda i-lens yokusondeza, ngoba izinhlobo ezimbili zezoom zihluke kakhulu komunye nomunye. Empi ye-zoom optical vs. zoom yedijithali, ukusondeza okukodwa okukodwa - kuyasiza kakhulu kubathwebuli bezithombe.
Ngamakhamera amaningi adijithali, i-lens yokusondeza ihamba phambili uma isebenza, isuka kumzimba wekhamera. Amanye amakhamera adijithali, noma kunjalo, adala ukusondeza ngenkathi elungisa ilensi kuphela ngaphakathi komzimba wekhamera . Qhubeka ukufunda ukuze uthole ulwazi oluthe xaxa olungakusiza uqonde ama-zoom lensiza wekhamera kangcono futhi angakusiza ukuthi uqede impikiswano yokusondeza okubonakalayo ngokusondeza kwe-digital!
I-Optical Zoom
Ukusondeza okubonakalayo kuthatha ukunyuka kwangempela ekugqeni kwe-lens. Ubude obugxile bubanga phakathi kwephakathi kwe-lens kanye nenzwa yesithombe. Ngokuhambisa i-lens ekude nomzwa wesithombe ngaphakathi komzimba wekhamera, ukusondeza kuyanda ngoba ingxenye encane yesehlakalo ibetha inzwa yesithombe, okuholela ekukhuliseni.
Uma usebenzisa ukusondeza kwe-optical, ezinye amakhamera zedijithali zizoba ne-zoom esheshayo, okusho ukuthi ungayeka nganoma yisiphi iphuzu lonke ubude bokusondeza kwe-zoom yangaphakathi. Amanye amakhamera adijithali azosebenzisa ukuma okuhlukile phakathi nobude bokusondeza, ngokuvamile kukukhawulela phakathi kwezingxenye ezine zokuzijabulisa ezinezinxenye eziyisikhombisa.
I-Zoom ye-Digital
Isilinganiselo sokusondeza kwedijithali ekhamera yedijithali, ukuyibeka ngokucacile, akusizi ngalutho ngaphansi kwezimo zokudubula eziningi. Ukusondeza kweDivaysi kuyi-ubuchwepheshe lapho ikhamera idonsela khona isithombe bese izitshalo bese ziphakamisa ukuze zenze isithombe esiseduze sokuvota. Le nqubo idinga ukukhulisa noma ukususa amaphikseli athile, okungabangela ukuchithwa kwekhwalithi yesithombe.
Esikhathini esiningi ungenza imisebenzi elingana nesisindo se-digital nesofthiwe yokuhlela isithombe kwikhompyutha yakho ngemuva kokudubula isithombe. Uma ungenayo isikhathi sokufinyelela noma ukufinyeleleka kwisofthiwe yokuhlela, ungasebenzisa ukusondeza kwe-digital ukudubula ngesinqumo esiphezulu bese usungula ukuvala ngokuzenzakalelayo ngokususa amaphikseli bese unyakaza isithombe kuze kube nesinqumo esincane esisahlangabezana nokunyathelisa kwakho izidingo. Ngokusobala, ukubaluleka kokusondeza kwe-digital kunqunyelwe ezimweni ezithile.
Ukuqonda Ukulinganisa Ukulinganisa
Uma ubheka imininingwane yekhamera yedijithali, kokubili ukulinganisa kwe-optical nedijithali kubhalwe njengenombolo ne "X," njenge-3X noma i-10X. Inombolo ekhudlwana ibonisa amandla okukhulisa okunamandla.
Khumbula ukuthi akuwona wonke ama-"10X" wekhamera yokulinganisa okulinganayo okufanayo. Abakhiqizi balinganisa ukusondeza kwe-optical kusuka kwamandla amaningi we-lens kuya kwesinye. Ngamanye amazwi, "i-multiplier" ngukumahluko phakathi kokulinganisa okuncane kunazo zonke nakakhulu kunazo zonke zokulinganisa kwe-lens. Isibonelo, uma i-lens ye-zoom ye-10X ekhamera yedijithali inebude obuncane obungama-35mm, ikhamera yayizoba nobude obunzulu obungama-350mm. Kodwa-ke, uma ikhamera yedijithali inikeza amanye amakhono angaphezulu-angle futhi inezinga elilinganiselwe lama-28mm, khona-ke ukuphakama kwe-optical 10X kuyoba nobude obunzulu obungama-280mm kuphela.
Ubude obugxile kufanele bubhalwe ohlwini lwekhamera, ngokuvamile kufomathi efana ne "35mm ifilimu elinganayo: 28mm-280mm." Ezimweni eziningi, isilinganiso se-lens 50mm kubhekwa njengesijwayelekile, ngaphandle kokukhulisa futhi kungekho-angle evulekile amandla uma uzama ukuqhathanisa uhlu olubanzi lwe-zoom lensi ethile, kubalulekile ukuthi uqhathanise inombolo ye-35mm yefilimu elinganayo ukusuka ku-lens kuya ku-lens. Abanye abakhiqizi bazoshicilela ububanzi obude obude bokugcina ubude eceleni kwenombolo elingana no-35mm, ngakho-ke kungaba ukudideka okuncane uma ungaboni inombolo efanele.
Amalensi aguquguqukayo
Amakhamera adijithali ahlose abaqalayo kanye nabasebenzisi abaphakathi bahlinzekela nge-lens eyakhelwe kuphela. Nokho, amakhamera amaningi e-SLR (DSLR) angasebenzisa amalensi aguquguqukayo. Nge-DSLR, uma i-lens yakho yokuqala ingenawo ama-wide angle noma amakhono wokusondeza oyifunayo, ungathenga amalensi engeziwe abanikeza ukuzondeza okungaphezulu noma izinketho ezingcono kakhulu.
Amakhamera we-DSLR ayabiza kakhulu kunamodeli we-point-and-shoot, futhi ngokuvamile ahloswe kubathwebuli bezithombe eziphakathi noma eziphambili.
Amalensi amaningi e-DSLR ngeke afake inombolo ye- "X" yokulinganisa kwe-zoom. Esikhundleni salokho, ubude obugxile buzofakwa ohlwini, ngokuvamile njengengxenye yegama lensiza ye-DSLR. I-DIL (amamitha angashintshashintshayo amamitha), amakhemikhali angama-lens angaguquguquki (i-ILC), futhi asebenzise amalensi ahlanganiswe ubude bawo obugxile, esikhundleni se-X zoom inombolo.
Ngomkhamera we-lens ongashintshashintshayo, ungakwazi ukubala isilinganiselo sokusondeza ngokwakho usebenzisa ifomula elula yezibalo. Thatha ubude obunzulu obukhulu bokuthi i-lens yokusondeza engashintshayo ingafinyeleleka, ithi 300mm, futhi uhlukanise ngesikhatsi esincane sokugxila, uthi 50mm. Kulesi sibonelo, isilinganiso sokulinganisa okulinganayo se-6X.
Ezinye ze-Zoom Lens Drawbacks
Nakuba ukhetha ikhamera yephuzu-ne-shoot nge-lens enkulu yokusondeza i-optical isifiso kubathwebuli bezithombe eziningi, ngezinye izikhathi kubonisa ukushiyeka okuncane okuncane.
- Umsindo. Amanye amakhamera aphansi, angabizi asebenza ngezansi kwekhwalithi yesithombe ngenxa yomsindo lapho i-lens inwetshelwe khona amandla okusondeza okuphezulu. Umsindo wekhamera ye-Digital iyisethi yamaphikseli alahlekile angabhalisi kahle, ngokuvamile avela njengemiphetho eluhlaza okwesibhakabhaka esithombeni.
- Ukuxhuma. Ukumisa okukhulu kakhulu ngezinye izikhathi kubangele ukuxuba, okuyinto ukuphazamiseka lapho izingqimba ezingakwesokunxele nezingakwesokudla zithombe zibonakala zilula. Imigqa evulekile ivela kancane ephihliwe phakathi kwehlaka. Futhi, le nkinga ngokuvamile ikhawulelwe kumazinga okuqala, ama-cameras angabizi anama-lenses amakhulu.
- Isikhathi sokuphendula esincane kakhulu. Uma usebenzisa ukuphakanyiswa okukhulu kokusondeza, isikhathi sokuphendula se-shutter ngezinye izikhathi sihamba kancane, okungabangela izithombe ezifiphala. Ungase futhi ulahlekelwe isithombe esisodwa ngenxa yesiphetho esincane se-shutter . Ivele ithatha ikhamera yedijithali isikhathi eside ukugxila esithombeni esimisweni sokusondeza esiphezulu, esichaza isikhathi esincane sokuphendula se-shutter. Izinkinga ezinjalo ziphakanyiswa lapho kudutshulwa kusondeza okuphezulu ekukhanyeni okuphansi .
- Kudinga i-tripod. Ukusebenzisa i-lens ende yokusondeza kungabangela ukuzamazama kwekhamera okwandisiwe. Amanye amakhamera adijithali angalungisa le nkinga ngokusebenzisa ukusimama kwesithombe . Futhi ungasebenzisa i-tripod ukuvimbela izithombe ezifiphazayo kusuka ekubanjeni kwekhamera.
Ungakhohlisi
Uma kugcizelela ukucaciswa kwemikhiqizo yabo, abanye abakhiqizi bazohlanganisa ukuzwakalisa kwedijithali nokulinganisa kwe-optical zoom, okubenza baveze inombolo enkulu yokuhlanganiswa ebusweni ngaphambili kwebhokisi.
Kodwa-ke, udinga ukubheka kuphela inombolo ye-optical zoom, engase ibhalwe ohlwini ekhoneni ngemuva kwebhokisi, kanye nezinombolo eziningi zezinombolo. Kungase kudingeke wenze ukucinga okuncane ukuze uthole ukulinganisa okubonakalayo kwe-model ethile.
Endabeni yama-zoom lensimbi yedijithali, ihlaziya ukufunda umbhalo ohle. Qonda i-lens yokusondeza, futhi uzosebenzisa kakhulu ukuthengwa kwekhamera yakho ye-digital.