I-EFL BFL FFL ne-FBL

I-EFL (I-Effective Focal Length), ebhekisela kubude bokugxila obusebenzayo, ichazwa njengebanga ukusuka enkabeni yelensi ukuya endaweni yokugxila. Ngedizayini yokubona, ubude befocal buhlukaniswa ngobude obugxilile bohlangothi lwesithombe kanye nobude obugxilile bohlangothi lwento. Ngokucacile, i-EFL iphathelene nobude bokugxila ohlangothini lwesithombe, okungukuthi, ibanga ukusuka endizeni eyinhloko eseceleni kwesithombe ukuya endaweni yokugxila eseceleni kwesithombe. Njengenye yemingcele ebalulekile ekwakhiweni kwesistimu ye-optical, i-EFL ithonya kakhulu ukusebenza kwesistimu. Ubude bokugxila obufushane kakhulu bungase bubangele inkambu ebanzi ngokwedlulele ye-engeli yokubuka, okuholela ekuhlanekezeni okunamandla kanye nezinselele zokulawula i-engeli yokuphuma ye-chief ray. Ngokuphambene, ubude bokugxila obude kakhulu bungaphazamisa ukwakheka kwesistimu ehlangene futhi buhluleke ukuhlangabezana nezimfuneko zohlelo lokusebenza ngenxa yenkambu yokubuka emincane kakhulu.

I-BFL (I-Back Focal Length), noma ubude be-optical back focal, buchazwa njengebanga ukusuka endaweni engemuva yelensi yokugcina kusistimu yokubona ukuya endizeni yesithombe. Njengepharamitha eyinhloko ekwakhiweni kokubona, i-BFL ithinta ngokuqondile ubude besistimu iyonke kanye nokunemba kobude obugxilile obungemuva. Ngakho-ke, kufanele kubhekwe ngokucophelela ngesikhathi sokuklama uhlelo.

I-FFL (I-Front Focal Length), noma ubude be-optical front focal, imele ibanga ukusuka endaweni engaphambili yelensi yokuqala kusistimu yokubona ukuya endaweni yento. Kubalulekile ukuqaphela ukuthi i-FFL ihluke kakhulu ku-FBL (Flange Focal Length). Owokuqala ubhekisela ebangeni elibonakalayo, kanti leli lakamuva libhekisela ebangeni lemishini.

I-FBL (I-Flange Focal Length), noma ubude obugxilile be-flange, buchazwa njengebanga ukusuka endaweni yokugcina yomshini ukuya endaweni yesithombe seqembu lelensi. Ekwakhekeni kwezixhumanisi zekhamera nezamalensi, i-FBL iyipharamitha ebalulekile enquma indawo enembile lapho ilensi ifakwe khona kukhamera.

Kafushane, le mingcele ibalulekile ekwakhiweni kwamalensi okukhanya. Aziba nomthelela oqondile kuphela ekusebenzeni kwamalensi kanye nekhwalithi yokuthwebula izithombe kodwa futhi zithinta ngokujulile ukuba nokwenzeka komklamo wesistimu.