Amakhamera Edijithali Asheshayo E-Autofocus: Ukusungula Izinto Ezintsha Nobuchwepheshe Enkathini Yanamuhla
Amakhamera edijithali athuthuke kakhulu selokhu asungulwa. Enye yezinto ezintsha ezibaluleke kakhulu kumakhamera edijithali uhlelo lwe-autofocus olusheshayo. I-autofocus esheshayo ivumela abasebenzisi ukuthi bathwebule izithombe ngobukhali obukhulu nangesikhathi esifushane, noma ngabe isihloko sihamba. Lesi sihloko sizohlola ubuchwepheshe obungemuva kwe-autofocus esheshayo nokuthi bushintshe kanjani umhlaba wezithombe.
Umlando Omfushane We-Autofocus
I-Autofocus yethulwa okokuqala kumakhamera ngasekupheleni kwawo-1970. Lolu hlelo lokuqala lwalusebenzisa indlela yokuthola umehluko ngokusekelwe ekuhloleni ubukhali bokukhanya okungena ku-sensor. Nakuba luyintsha ngaleso sikhathi, lobu buchwepheshe babunezinkinga eziningana, njengokusabela kancane kanye nokungalungi ezimweni zokukhanya okuphansi.
Ngawo-1980, amakhamera anezinhlelo zokubona i-phase-detection autofocus aqala ukuvela emakethe. Lolu hlelo lusebenza ngokuhlukanisa ukukhanya okungena ku-sensor kube yimifudlana emibili bese kulinganiswa umehluko wesigaba ukuze kutholakale ukugxila okuqondile. Lobu buchwepheshe bokubona i-phase-detection autofocus bunikeza isivinini esisheshayo kanye nokunemba okukhulu kunokuthola umehluko.
Njengoba singena ekhulwini lama-21, intuthuko kwezobuchwepheshe njengokusetshenziswa kwezinzwa ze-CMOS kanye nama-processor ezithombe asheshayo inyuse i-autofocus yayisa ezingeni elilandelayo. Namuhla, i-fast autofocus iyisici esijwayelekile kumakhamera edijithali anamuhla, kusukela kuma-SLR kuya kumakhamera angenazibuko ngisho namakhamera efoni ephathekayo.
Ubuchwepheshe Obusekela Ukugxilisa Okusheshayo Kwe-Autofocus
Kunezindlela eziningana zobuchwepheshe ezibalulekile ezivumela i-autofocus esheshayo kumakhamera edijithali:
1. Ukutholwa Kwesigaba Senzwa Evuliwe
Kumakhamera anamuhla, ukutholwa kwesigaba manje kwenziwa ngqo ku-sensor yesithombe, eyaziwa ngokuthi ukutholwa kwesigaba esiku-sensor. Lobu buchwepheshe buvumela i-autofocus esheshayo nenembile kakhulu. I-sensor yesithombe ifakwe amaphikseli e-AF avumela ukulinganiswa kwesigaba ngqo ku-sensor, okunciphisa isikhathi esidingekayo ukuze kufinyelelwe ukugxila okunembile.
2. I-Dual Pixel Autofocus
I-Dual Pixel Autofocus ubuchwepheshe obuthuthukiswe yiCanon futhi bethulwa okokuqala kumakhamera ayo e-DSLR. Iphikseli ngayinye esenzwa yesithombe ihlukaniswe ngama-photodiode amabili angakwazi ukubona ukukhanya ngokuzimela. Lokhu kuvumela ikhamera ukuthi igxile ngokushesha nangokunembile, ngisho nalapho iqopha ividiyo noma ilandelela izinto ezihamba ngokushesha.
3. Inzwa ye-CMOS Esebenza Kakhulu
Izinzwa ze-CMOS zesimanje zihlonyiswe ngamakhono okucubungula idatha ngesivinini esikhulu. Lokhu kusekela ukusebenza okusheshayo kwe-autofocus ngokunika amandla ukuhlaziywa kwesithombe ngesikhathi sangempela. Ukugeleza okusheshayo kwedatha kusuka kunzwa kuya kuphrosesa yesithombe kuvumela ikhamera ukuthi yenze ukulungiswa kokugxila ngokushesha nangendlela efanele.
4. Iprosesa Yesithombe Ethuthukisiwe
Iprosesa yesithombe nayo idlala indima ebalulekile ezinhlelweni ezisheshayo ze-autofocus. Amaprosesa anamuhla, njenge-BIONZ yakwa-Sony, i-Canon's DIGIC, kanye ne-Nikon's EXPEED, anamandla anele okucubungula idatha yenzwa ngokushesha. Lokhu kusho ukuthi ulwazi oluqoqwe uhlelo lwe-autofocus lungahunyushwa ngokushesha lube ukulungiswa okuqondile kokugxila.
5. Ukufunda Komshini kanye ne-AI
Intuthuko yakamuva kubuhlakani bokwenziwa (i-AI) kanye nokufunda komshini nayo isiqala ukusetshenziswa ezinhlelweni zekhamera ezizenzakalelayo. Amakhamera ahlonyiswe nge-AI angabona amaphethini athile, ubuso, nezinto, okwenza kube lula ukugxila okusheshayo nokunembile. Lobu buchwepheshe bufunda kudatha eqoqwe ukuze buthuthukise ukusebenza kwe-autofocus ngokuqhubekayo ngokuhamba kwesikhathi.
Izinzuzo Zokugxilisa Okusheshayo Kwezithombe Kwabathwebuli Bezithombe
1. Thatha Isikhathi Ngokushesha
Ezweni lokuthatha izithombe, isikhathi siyikho konke. Ukukwazi ukuthwebula izikhathi ezibalulekile njengoba zenzeka kuyinzuzo enkulu, kungakhathaliseki ukuthi kwezemidlalo, izilwane zasendle, noma izithombe zansuku zonke. I-fast autofocus ivumela abathwebuli bezithombe ukuthi bathwebule izithombe ngokukhalipha okukhulu ngokuphazima kweso.
2. Izithombe Ezingaguquki Nezihambayo
I-Fast autofocus iwusizo kakhulu ezimweni lapho abantu behamba ngokushesha. Abathwebuli bezithombe bezemidlalo noma bezilwane zasendle bangathwebula izithombe ezibukhali zezinto ezihamba ngesivinini esiphezulu. I-Dual Pixel Autofocus, isibonelo, isibe yindinganiso ekudwebeni kwevidiyo, okuvumela ukugxila okubushelelezi ngenkathi uqopha.
3. Ukunemba Okuphezulu Ezimweni Ezihlukahlukene Zokukhanya
Ubuchwepheshe besimanje buvumela i-autofocus ukuthi isebenze kahle ezimweni ezinokukhanya okuphansi. Izinhlelo ezindala zivame ukuba nezinkinga kulezi zimo, kodwa ngezinzwa ezibucayi kakhulu kanye nama-processor asheshayo, amakhamera manje angafinyelela ukugxila okubukhali ngisho nasezimweni zokukhanya eziyinselele.
4. Ukugxila Okungcono Kwe-Auto kanye Ne-Manual
Ijubane akuyona yodwa inzuzo. Uhlelo lwe-autofocus olusheshayo lunikeza nabathwebuli bezithombe ithuba lokushintsha phakathi kwe-autofocus kanye ne-manual focus. Lokhu kuvumela ukulawula okukhulu kokudala ngenkathi kunikeza inzuzo yejubane le-autofocus esheshayo uma kudingeka.
Ucwaningo Lwesibonelo: Amakhamera Ahamba Phambili Ane-Autofocus Esheshayo ngo-2023
Amamodeli amaningana amakhamera abeke amazinga amasha mayelana nokugxila okusheshayo kwe-autofocus ngo-2023. Izibonelo ezilandelayo zibonisa indlela lobu buchwepheshe obusetshenziswa ngayo kumakhamera anamuhla.
1. I-Canon EOS R5
I-Canon EOS R5 ingenye yamakhamera angenazibuko amahle kakhulu anesistimu ye-autofocus ethuthuke kakhulu. Ifaka i-Dual Pixel CMOS AF II enendawo yokugxila engu-100% kanye namaphuzu angu-1.053 e-AF akhethiwe. Lolu hlelo luvumela ukugxila okusheshayo nokunembile kakhulu, kokubili ekuthwebuleni izithombe ezinganyakazi kanye namavidiyo.
2. I-Sony Alpha a1
I-Sony Alpha a1 ihlanganisa ubuchwepheshe obuhlukahlukene obuthuthukisiwe ukuze ilethe ukusebenza okungenakuqhathaniswa kwe-autofocus. Isebenzisa uhlelo lwe-hybrid AF olunamaphuzu okuthola isigaba angu-759 kanye namaphuzu okuthola umehluko angu-425, olumboza cishe yonke indawo yesithombe. Njengoba inejubane lokudubula elingafika ku-30 ozimele ngomzuzwana, ilungele izithombe zezemidlalo nezilwane zasendle.
3. I-Nikon Z9
I-Nikon Z9 iyikhamera eyinhloko ye-Nikon, equkethe uhlelo olusha lwe-multi-algorithm autofocus. Ngamaphuzu okuthola isigaba angu-493 kanye namakhono okulandelela izihloko athuthukile, le khamera inikeza i-autofocus esheshayo nenembile kakhulu. Inzwa ye-CMOS ehlanganisiwe isiza ekuhlinzekeni isivinini sokucubungula esidingekayo ukuze kusebenze kahle.
Isiphetho
Ukugxila okuzenzakalelayo okusheshayo kumakhamera edijithali kuwubufakazi bentuthuko yezobuchwepheshe ekuthwebuleni izithombe. Ngokusungula izinto ezintsha njengokutholwa kwesigaba esisenzwa, i-Dual Pixel Autofocus, kanye nokuhlanganiswa kobuhlakani bokwenziwa, amakhamera esimanje ayakwazi ukuletha ukusebenza okuhle kakhulu ezimweni eziningi ezahlukene.
Izinzuzo ze-autofocus esheshayo ziningi, kusukela ekhonweni lokuthwebula ngokunembile izikhathi ezibalulekile kuya ekuguquguqukeni okuphezulu kanye nokunemba ezimweni ezahlukahlukene zokukhanya. Ekugcineni, lobu buchwepheshe abugcini nje ngokwenza umsebenzi wabathwebuli bezithombe abangochwepheshe ube lula kodwa futhi buthuthukisa ulwazi kanye nemiphumela yabasebenzisi bekhamera yedijithali bebonke.
Njengoba ubuchwepheshe buqhubeka buthuthuka, ikusasa le-autofocus esheshayo libukeka lithembisa kakhulu. Singalindela ukusungulwa okusha okwengeziwe ukuze kuphakanyiswe ukusebenza kwe-autofocus emazingeni aphezulu nakakhulu, kufezwe izidingo nezifiso zabathwebuli bezithombe emhlabeni jikelele.
