Optical Zoom Vs. Zoom Digital
Abavelisi banqwenela ukwenza izinto zibe lula kuwe xa uthengisa ikhamera yedijithali , ngokukodwa ngokugqamisa imilinganiselo ethile yeemodeli zabo, njengezikhulu ezinkulu zeegapixel kunye nobukhulu besikrini se-LCD.
Nangona kunjalo, loo manani ayisoloko esichazela ibali lonke, ngokukodwa xa ukhangela iilensi zokulondoloza kwikhamera yedijithali. Abavelisi balinganisa amandla okuzonga amaekhamera zedijithali kumalungiselelo amabini: Uluhlu olusondeleyo olwenziwe ngokukhenketha kwedijithali. Kubalulekile ukuqonda i-lens zoom, kuba iindidi ezimbini zezoom zihluke kakhulu. Kwimfazwe ye-optical zoom zoom zoom digital, i-single-optical zoom - ihlala isiluncedo kubafoto.
Uninzi lweekhamera zedijithali, i-lens zoom iqhubekela phambili xa isebenzise, isuka kumzimba wekhamera. Ezinye iikhamera zedijithali, nangona kunjalo, zenza ulwakhiwo ngexesha lokulungisa i-lens kuphela kumzimba wekhamera . Qhubeka ufunda ukuze ufumane ulwazi oluthe luncedo kunokukunceda uqonde iilensi ze-zoom zoom kunye nokuba kunokukunceda ukuphelisa impikiswano ye-zoom zoom kunye ne-zoom zoom.
Optical Zoom
Uluhlu lwe-Optical lubonisa ukwanda okwenyani kumgama ogqamile we-lens. Ubude becala ngumgama phakathi kweziko le-lens kunye nenzwa yomfanekiso. Ngokuhambisa i-lens engaphezulu kwisitho somfanekiso ngaphakathi komzimba wekhamera, ukukhushulwa kwanda ngenxa yokuba inxalenye encinci yesiganeko ibetha umtshini wesithombe, okubangele ukukhulisa.
Xa usebenzisa i-zoom optical, ezinye iikhamera zedijithali ziya kuba ne-zoom zoom, ebonisa ukuba unokuyeka nayiphi na indawo kunye nobude obude bokusondeza okwakusondeza okuyingxenye. Ezinye iikhamera zedijithali ziza kusebenzisa iimpawu ezahlukileyo kunye nobude bokusondeza, ngokuqhelekileyo kukukhawulelana phakathi kweendawo ezine ezikhethiweyo.
Zoom Digital
Isilinganiselo se zoom digital kwikhamera yedijithali, ukuyibeka ngokucacileyo, ayikho nto phantsi kweemeko ezininzi zokudubula. Ukulondoloza idijithali yitheknoloji apho ikhamera ikhupha isithunzi kwaye izityalo ziyakudumisa ukuze zenze isithombe esisekufuphi. Le nqubo idinga ukukhulisa okanye ukususa iipekseli ezizimele, ezinokubangela ukuchithwa komgangatho wemifanekiso.
Uninzi lwexesha unako ukwenza imisebenzi elinganayo ne-zoom zoom ye-digital kunye ne-software-editing software kwikhompyutheni yakho emva kokudubula isithombe. Ukuba awunalo ixesha okanye ufikelele kwisofthiwe yokuhlela, ungasebenzisa i-zoom yedijithali ukudubula kwisisombululo esiphezulu uze udale ukuvala ngokukhawuleza ngokususa iipikseli kunye nokuchukumisa isithombe kwisisombululo esincinane esasifumana ukuprinta kwakho. iimfuno. Kucacile ukuba, ukusetyenziswa kocwangciso lwedijithali kuncinci kwiimeko ezithile.
Ukuqonda Ukulinganiswa koLwazi
Xa ukhangela iinkcazo zekhamera yedijithali, zombini i-optical and digital zoom measurements are listed as a number and "X," njenge-3X okanye 10X. Inani elikhulu libonisa amandla okukhulisa amandla.
Gcina ukhumbule ukuba akusiyo yonke ikhamera ye "10X" yokulinganisa i-zoom eyeyiyo. Abavelisi balinganisa i-zoom ye-optical ukusuka kwinqanaba elithile lamandla lens ukuya kwelinye. Ngamanye amagama, "ukuphindaphinda" ngumlinganiselo phakathi kweyona ncinane kunye neyona nkulu kakhulu yokulinganisa ubude beli lensi. Umzekelo, ukuba i-lens ye-zoom ye-10X kwikhamera yedijithali inobungakanani obuncinci obungama-35mm, ikhamera iya kuba nobude obude obungama-350mm. Nangona kunjalo, ukuba ikhamera yedijithali inikezela ngamanye amanqanaba angaphezulu-angle kwaye inexabiso elincinci le-28mm, ngoko-zoom ye-10X ye-optical i-280mm kuphela.
Ubude obude bufanele kubhalwe kwiinkcazo zekhamera, ngokuqhelekileyo kwifomati efana ne "35mm film equals: 28mm-280mm." Kwiimeko ezininzi, ukulinganisa i-lens 50mm kuthathwa njengesiqhelo Unokuzama ukuthelekisa uluhlu olubanzi lwe-zoom lens ethile, kubalulekile ukuba uqhathanise inombolo yefilimu engama-35mm elinganayo ukusuka kwilensi ukuya kwilensi. Abanye abavelisi baya kushicilela uluhlu olude lobunzima bembali kunye neenombolo ezilinganayo ezingama-35mm, ngoko ke kunokudideka xa ungakhange ubheke inombolo efanelekileyo.
Lens eguquguqukayo
Iikhamera zedijithali ezijoliswe kubaqalisi kunye nabasebenzisi abaphakathi bazinikezela kuphela i-lens eyakhelwe. Uninzi lweekhamera ze-SLR (DSLR), nangona kunjalo, zingasebenzisa iilensi eziguquguqukayo. Nge-DSLR, ukuba i-lens yakho yokuqala ayinayo i-angle-angle okanye i-zoom yekhono oyifunayo, ungathengisa ii-lens ezongezelelweyo ezinika ukongeza kwee-zoom okanye ezingcono zokukhetha i-angle angle.
Iikhamera ze-DSLR zibiza kakhulu kuneemodeli zephuzu-ne-shoot, kwaye zidla ngokujoliswe kumaphephancwadi abaphakathi okanye abaphambili.
Uninzi lwama-DSLR aluyi kuqukwa nenombolo "X" yokulinganisa. Endaweni yoko, ubude obujoliswe kuyo buza kubalwa kuphela, ngokuqhelekileyo njengenxalenye yegama le-DSLR lense. I-DIL (i-lens eguquguqukayo yedijithali) iikhamera, eziyikhamera ezingenakunjengeli-lens (ILC), nazo zisebenzisa iilensi ezidweliswe ubude babo obude, kunokuba i-X zoom number.
Ngekhamera yelenki eguquguqukayo, unako ukubala isilinganiselo sokwenza umzobo ngokwakho usebenzisa i-formula elula yemathematika. Thatha ubude obuphambili obunokuthi i-lens yokudibanisa ikwazi ukufeza, yitsho i-300mm, uze uyihlule ngobuncinci obuncinane, uthi 50mm. Kulo mzekelo, isilinganiselo sokulinganisa i-optical measurement will be 6X.
Ezinye zeZowom Lens Drawbacks
Nangona ukhetho lwekhamera kunye ne-zoom enkulu ye-zoom lens lunqweneleka kubaninzi beefoto, ngamanye amaxesha kubonisa ukungaphumeleli okumbalwa.
- Umsindo. Amanye amazinga okuqala, amaekhamera angabizi aphantsi kobunjani bomgangatho obuncinane ngenxa yesandi xa i-lens inwezelwa kwi-zoom enkulu. Umsindo wekhamera yedijithali yiseti yeepekseli ezilahlekileyo ezingabhalwanga ngokuchanekileyo, ngokuqhelekileyo zibonakala njengemiphetho eluhlaza okwesibhakabhaka esithombeni.
- Pincushioning. Ukuvama okukhulu kunamanye amaxesha kubangelwa ukuphambana, okuphambanisayo apho imida eseleyo nekhohlo yesithombe ifana ilulwa. Imigca ye-Horizontal ibonakala ijikeleze ngapha nangapha. Kwakhona, le ngxaki ihlala iphela kwizinga eliphezulu, iikhamera ezingabizi ngeentengiso ezinkulu.
- Ixesha elide lokuphendula umva. Xa usebenzisa i-magnification zoom magnification, ixesha lokuphendula i-shutter liye linciphise, elibangela iifoto ezintle. Ungaphinde ulahleke umfanekiso wesigxina ngenxa yeempendulo ezithintekayo . Kuthatha nje ikhamera yedijithali ixesha elide ukuba ligxininise kumfanekiso kwi-zoom ephezulu yokupasa, echaza ixesha lokuphendula ixesha elide. Iingxaki ezinjalo ziphakanyiswa xa kuthungwa kwi zoom zoom ephezulu.
- Kudinga i-tripod. Ukusebenzisa i-lens ende ye-zoom ingabangela ukwanda kwekhamera. Ezinye iikhamera zedijithali ziyakulungisa le ngxaki ngokusebenzisa ukuzinza komfanekiso . Kananjalo ungasebenzisa i-tripod ukukhusela iifoto eziphazamisayo ukusuka kwintetho yekhamera.
I-Don & # 39; t Yenza i-Fooled
Xa ugxininisa iinkcukacha zemveliso yazo, abanye abavelisi baya kudibanisa idijithali yedijithali kunye nemilinganiselo yokutsalonga, ukuvumela ukuba baveze inamba enkulu yokudibanisa ehlangene ebhokisini.
Kodwa ke, kufuneka ukhangele kuphela kwinombolo yecala lokubonisa, elingabonakaliswa kwikona emva kwebhokisi, kunye neenombolo zamanye amanqaku. Unokwenza ukukhangela okufutshane ukuze ufumane isilinganiselo sokusondeza kwendlela ethile.
Kwimeko yelijithali yedijithali yokusondeza iilensi, ihlawulela ukufunda okushicilelweyo. Qonda i-lens zoom, kwaye uza kwenza uninzi lwekhamera yakho yedijithali yokuthenga.