Yintoni iIlensi yeFisheyeIlensi yefisheye luhlobo lwelensi yekhamera eyenzelwe ukudala umbono obanzi wesiganeko, kunye nokuphazamiseka okubonakalayo okunamandla kakhulu nokucacileyo. Iilensi zeFisheye zinokubamba indawo ebanzi kakhulu yombono, rhoqo ukuya kuthi ga kwi-180 degrees nangaphezulu, okuvumela umfoti ukuba abambe indawo enkulu kakhulu yesiganeko kwifoto enye.

Ilensi yeliso lentlanzi

Iilensi zeFisheye zibizwa ngegama lazo elikhethekileyo lokugqwethwa, elidala umfanekiso ojikelezayo okanye ofana nomgqomo onokugqithiswa kakhulu kwaye wenziwe ube sisitayile. Isiphumo sokugqwethwa sibangelwa yindlela ilensi ekhanyisa ngayo ukukhanya njengoko idlula kwizinto zeglasi ezigobileyo zelensi. Esi siphumo singasetyenziswa ngokuyila ngabafoti ukwenza imifanekiso eyahlukileyo neguquguqukayo, kodwa sinokuba ngumda ukuba umfanekiso ojongeka njengendalo ufuna.

Iilensi zeFisheye ziza kwiintlobo ezahlukeneyo, kuquka iilensi zeFisheye ezijikelezayo, iilensi zeFisheye ezikroliweyo, kunye neelensi zeFisheye ezipheleleyo. Uhlobo ngalunye lweelensi zeFisheye luneempawu zalo ezikhethekileyo kwaye lufanelekile kwiintlobo ezahlukeneyo zemifanekiso.

Ngokungafaniyo neelensi ezijikelezayo,iilensi zeliso lentlanziazibonakali ngokupheleleyo ngobude befocal kunye ne-aperture yodwa. I-engile yombono, ububanzi bomfanekiso, uhlobo lweprojektha, kunye nokugubungela kwesensor zonke ziyahluka ngokwahlukeneyo kwezi zinto.

Iintlobo zokusebenzisa ifomathi

Iilensi zeliso leentlanzi ezijikelezayo

Uhlobo lokuqala lweelensi ze-fisheye ezaveliswayo yayiziilensi “ezijikelezileyo” ezinokudala umfanekiso ojikelezayo onombono we-180-degree. Zinobude obufutshane kakhulu be-focal, obuhlala buqala kwi-7mm ukuya kwi-10mm, nto leyo ebenza bakwazi ukuthwebula umbono obanzi kakhulu wendawo.

Ilensi yeliso lentlanzi ejikelezayo

Iilensi zefisheye ezijikelezayo zenzelwe ukuvelisa umfanekiso ojikelezayo kwisensor yekhamera okanye iplani yefilimu. Oku kuthetha ukuba umfanekiso ophumayo unesimo esijikelezayo esinemida emnyama ejikeleze indawo ejikelezayo, nto leyo edala isiphumo esikhethekileyo "sesitya sentlanzi". Iikona zomfanekiso wefisheye ezijikelezayo ziya kuba mnyama ngokupheleleyo. Olu mnyama lwahlukile ekukhanyeni kancinci kancinci kweelensi ezijikelezayo kwaye luqala ngequbuliso. Umfanekiso ojikelezayo ungasetyenziselwa ukwenza iingoma ezinomdla nezinobuchule. Ezi zine-engile ethe nkqo, ethe tye kunye ne-diagonal yombono we-180°. Kodwa inokuba ngumda ukuba umfoti ufuna umlinganiselo womda ongxande.

Ijikelezileyoiilensi zeliso lentlanziZihlala zisetyenziswa kwimifanekiso yobugcisa neyobugcisa, njengakwimifanekiso yezakhiwo, imifanekiso engabonakaliyo, kunye nemifanekiso yezemidlalo egqithisileyo. Zingasetyenziselwa nezicelo zesayensi kunye nezobugcisa apho kufuneka umbono obanzi, njengakwi-astronomy okanye kwi-microscopy.

Iilensi ze-fisheye ezi-diagonal (ezibizwa ngokuba yi-full-frame okanye i-rectangular)

Njengoko iilensi zefisheye zazisanda kuthandwa kwiifoto ngokubanzi, iinkampani zeekhamera zaqala ukuvelisa iilensi zefisheye ezinesangqa somfanekiso esikhulu ukuze zigubungele yonke ifreyimu yefilimu engunxande. Zibizwa ngokuba zii-fisheyes ezithe tyaba, okanye ngamanye amaxesha “ezingunxande” okanye “ezipheleleyo”.

Iilensi zefisheye eziziidiagonal luhlobo lwelensi yefisheye enokudala umbono we-engile ebanzi kakhulu wescene enombono we-diagonal we-180 ukuya kwi-190 degrees, ngelixa ii-engile ezithe tye nezithe nkqo ziya kuba zincinci. Ezi lensi zivelisa umbono ogqwethekileyo nogqithisileyo, kodwa ngokungafaniyo neelensi zefisheye ezijikelezayo, zizalisa isakhelo sonke soxande lwesensor yekhamera okanye iplani yefilimu. Ukuze ufumane isiphumo esifanayo kwiikhamera zedijithali ezineesensor ezincinci, kufuneka ubude obufutshane befocal.

Isiphumo sokugqwethwa kwe-diagonalilensi yeliso lentlanziidala inkangeleko eyahlukileyo neyothusayo engasetyenziswa ngokuyila ngabafoti ukuthwebula imifanekiso eguquguqukayo netsala amehlo. Imbono egqithisileyo inokudala ubunzulu kunye nentshukumo kwindawo ethile, kwaye ingasetyenziselwa ukwenza iingoma ezingacacanga nezingaqhelekanga.

Ilensi yefisheye ethe tyaba

Iilensi zefisheye ezinemifanekiso okanye ezijikelezileyo

Isangqa esinqumliweyoiilensi zeliso lentlanzikukho olunye uhlobo lwelensi yefisheye ekhoyo, ukongeza kwilensi yefisheye ejikelezayo kunye neelensi zefisheye ezipheleleyo endizikhankanyileyo ngaphambili. I-intermediate phakathi kwe-diagonal kunye ne-circular fisheye inomfanekiso ojikelezayo olungiselelwe ububanzi befomathi yefilimu endaweni yokuphakama. Ngenxa yoko, kuyo nayiphi na ifomathi yefilimu engesikwere, umfanekiso ojikelezayo uya kunqunyulwa phezulu nasezantsi, kodwa usabonisa imiphetho emnyama ngasekhohlo nasekunene. Le fomathi ibizwa ngokuba yi-“portrait” fisheye.

Ilensi yefisheye ejikelezileyo

Ezi lensi zihlala zinobude obuphakathi kwe-10-13mm kunye nombono ophakathi kwe-180 degrees kwikhamera ye-crop-sensor.

Iilensi zefisheye ezikroliweyo ziyindlela efikelelekayo xa kuthelekiswa neelensi zefisheye ezigcwele uzimele, kwaye zibonelela ngembono eyahlukileyo enesiphumo sokujika esijikelezayo.

Iilensi zefisheye ezincinci

Iikhamera zedijithali ezincinci, ingakumbi xa zisetyenziswa njengeekhamera zokhuseleko, zihlala zineelensi zefisheye ukuze zikhuseleke kakhulu. Iilensi zefisheye ezincinci, ezifana neelensi zefisheye ze-M12 kunye neelensi zefisheye ze-M8, zenzelwe imifanekiso yeesenzi ezincinci ezisetyenziswa kakhulu kwiikhamera zokhuseleko. Ubungakanani befomathi yesenzi yomfanekiso ethandwayo esetyenziswayo buquka i-1⁄4″, 1⁄3″, kunye ne-1⁄2″. Ngokuxhomekeke kwindawo esebenzayo yesenzi yomfanekiso, ilensi efanayo inokwenza umfanekiso ojikelezayo kwisenzi yomfanekiso enkulu (umz. 1⁄2″), kunye nefreyimu epheleleyo kwisenzi encinci (umz. 1⁄4″).

Imifanekiso yesampulu ethathwe yi-M12 ye-CHANCCTViilensi zeliso lentlanzi:

Imifanekiso yesampulu ethathwe ziilensi ze-fisheye ze-M12 ze-CHANCCTV-01

Imifanekiso yesampulu ethathwe ziilensi ze-fisheye ze-M12 ze-CHANCCTV-02

Imifanekiso yesampulu ethathwe ziilensi ze-fisheye ze-M12 ze-CHANCCTV-03