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Ulwazi mayelana namapharamitha amalensi (lesi sihloko singahlukaniswa sibe esisodwa noma ezimbili ngokuya ngokuqukethwe)

1.Usayizi wesithombe

Usayizi wesithombe futhi ungusayizi wesibuko;

Usayizi wesithombe senzwa:

Qhubeka nokusebenzisa usayizi wefomethi evamile yeshubhu yekhamera, usayizi ongaphandle wedayamitha weshubhu yekhamera.

2.Ubude bokugxila

Umqondo ubhekisela ebangeni elisuka enkabeni yelensi ukuya endaweni okugxilwe kuyo yokuqoqa ukukhanya.Futhi futhi ibanga ukusuka enkabeni yelensi ukuya endizeni yokucabanga yendawo yenzwa kumojuli.Ubude bokugxila bubaluleke kakhulu. idatha, futhi izosetshenziswa ekubalweni kokujula kwenkambu kanye ne-FOV esikhathini esizayo.

3.Umbono

Kunezinhlobo ezintathu zamalensi: amalensi ajwayelekile, ama-engeli abanzi, namalensi e-telephoto.

Nakuba indawo iso lomuntu elingayibona ingafinyelela kuma-degree angu-180, i-engeli ekwazi ukubona ngempela ukuma nombala icishe ibe ama-degree angu-50. Ngokuvamile, i-engeli yokubuka yephaneli yokuthinta ingama-degree angu-55 kuya ku-65.Yebo, kufanele kusekelwe ezidingweni zangempela zamakhasimende;Isimiso se-Seesaw,Abakhiqizi beLens banethemba lokuklama insimu enkulu yokubuka engase ifanele izinzwa eziningi, kodwa uma umkhulu umkhakha wokubuka, kuba mkhulu ukuphambuka kwechromatic okudingekayo. ukunqotshwa.

4.I-Chromatic aberration

Ilensi yesithombe ayikwazi ukubuyisela ngokuphelele iphuzu noma isithombe sokukhanya esixubile sobude beza endaweni ethile, kodwa indawo ehlakazekile engaqondakali;isithombe sendiza yento akuseyona indiza, kodwa indawo egobile, futhi isithombe silahlekelwe ukufana.Lezi ziphambeko zezithombe zibizwa ngokuthi ama-chromatic aberrations.

5.Ukujula Kwenkambu & Ukujula Kokugxila

(1) Ukujula Kwenkambu Nokujula Kokugxila
Ngaphambi nangemva kokugxila, ukukhanya kuqala ukuqoqana futhi kusakazeke, futhi isithombe sephoyinti siyafiphala, sakhe umbuthano okhulisiwe.Lo mbuthano ubizwa ngokuthi isiyingi sokudideka.

Eqinisweni, isithombe esithwetshuliwe sibukwa ngendlela ethile (njengokuboniswa, ukukhuliswa kube isithombe, njll.).Isithombe esizwakala ngeso lenyama sinobudlelwano obukhulu nokukhulisa, ibanga lokuqagela kanye nebanga lokubuka.Uma ububanzi bomjikelezo wokudideka buncane kunekhono lokubandlulula leso lomuntu, ukufiphala okukhiqizwa isithombe sangempela kububanzi obuhlobene akunakubonwa.Lo mbuthano ongaqondakali wokudideka ubizwa ngokuthi umbuthano ovumelekile wokudideka.

(2) ukujula kwenkundla
Kunendingilizi evumelekile yokudideka ngaphambi nangemuva kwendawo okugxilwe kuyo, futhi ibanga phakathi kweziyingi ezimbili zokudideka libizwa ngokuthi ukujula kokugxila.Ngaphambi nangemuva kwesihloko (iphoyinti lokugxila), isithombe sisenobubanzi obucacile, okuwukujula kwenkambu.Ngamanye amazwi, ukujula kwangaphambili nangemuva kwesihloko kanye nezinga lokufiphala kwesithombe ebusweni befilimu konke kungaphakathi komkhawulo wombuthano ovunyelwe wokudideka.
Ukujula kwenkambu kuyahlukahluka ngobude bokugxila belensi, inani lokuvula, nebanga lokudubula.Ukuze uthole ubude obugxilile obugxilile nebanga lokudubula, uma indawo yokuvula isetshenziswa encane, kukhulu ukujula kwenkundla.Umgomo we-myopic love squinting.

(3) Isibonelo
I-Case study,CNF7246, Ilensi DS628A
Ipharamitha,EFL=2.94mm FNO=2.0 ISENSOR PIXEL SIZE=1.75um

(4)Vcm into engeyinhle yokugxila
Ukungagxili kahle eduze
Lapho uklama Isibambi, ukugxila kwangemuva kwelensi kusuka kude kuya eduze kuzoba ngaphakathi kwebanga le-VCM.Uma ukuphakama kwesibambi kungaklanywanga kahle, isibambi kulensi eseduze nokugxilwa kuyo sizovela, okuzoholela ekugxilweni okubuthakathaka eduze.

6.Ukuhlanekezela

Okubizwa ngokuthi ukuhlanekezela kubhekisela ezingeni lapho umugqa oqondile uphenduka khona ube ijika ngemva kokudubula nge-lens.Izinga lokuhlanekezela libalwa njengephesenti loshintsho kusayizi wesithombe ukuya kusayizi ofanele wokuthwebula. Ukulungiswa kweso lomuntu engeli kuyiminithi elingu-1 le-radian, okungaba ngu-1/60 wedigri engu-1, futhi impela iyazwela ekuqondeni nasekugotshweni komugqa.Ngakho-ke, amalensi amaningi e-imaging optical akhathazeke kakhulu ngokuchezuka kwe-angle yenkundla yokukhulisa, ngokuvamile abekwe ku-2%.

7.Ukukhanya kwesihlobo

Umqondo, isilinganiso sokukhanya senkambu yokubuka eduze kwe-eksisi yokubona kuya endaweni egcwele yokubuka endizeni yesithombe, okungukuthi, isilinganiso samakhona ayi-diagonal wenzwa yesithombe kuya ekukhanyeni okumaphakathi, leli nani likhawulelwe yi-cos4θ. i-theorem yokukhanya, namakhona ayindawo yeyunithi I-flux ekhanyayo ye-flux ekhanyayo iphansi, kodwa ayiphansi kakhulu kangangokuthi kukhona i-vignetting.


Isikhathi sokuthumela: Oct-08-2021