Ukuvuleka kwelensi, eyaziwa ngokuba yi "diaphragm" okanye "iris", yindawo evulekileyo apho ukukhanya kungena khona kwikhamera. Oku kuvuleka okubanzi kukuba, isixa esikhulu sokukhanya sinokufikelela kwinzwa yekhamera, ngaloo ndlela kube nefuthe ekuvezweni komfanekiso.
Imbobo ebanzi (inombolo f-encinci) ivumela ukukhanya okungakumbi ukuba kudlule kuyo, okukhokelela kubunzulu obungekho nzulu bebala. Ngakolunye uhlangothi, i-aperture encinci (i-f-number enkulu) inciphisa ukukhanya okungena kwi-lens, okukhokelela kubunzulu obukhulu bentsimi.
Ubungakanani bexabiso lokuvula lumelwe yinombolo F. Inkulu i-F-inombolo, incinci i-flux yokukhanya; ngokuchaseneyo, ubuninzi bokukhanya. Ngokomzekelo, ngokulungelelanisa i-aperture yekhamera ye-CCTV ukusuka kwi-F2.0 ukuya kwi-F1.0, inzwa ifumene ukukhanya okuphindwe kane kunangaphambili. Oku kunyuka kuthe ngqo kwisixa sokukhanya kunokuba neempembelelo ezininzi kunokuba luncedo kumgangatho uwonke womfanekiso. Ezinye zezi zibonelelo ziquka ukufiphala kwentshukumo encitshisiweyo, iilensi ezincinci eziziinkozo, kunye nezinye izixhasi ezipheleleyo zokukhanya okuphantsi.
Kwiikhamera ezininzi zokucupha, indawo yokuvula isayizi esisigxina kwaye ayikwazi ukulungiswa ukuze kulungiswe ukunyuka okanye ukuncipha kokukhanya. Injongo kukunciphisa ubunzima obupheleleyo besixhobo kunye nokunciphisa iindleko. Ngenxa yoko, ezi khamera zeCCTV zihlala zidibana nobunzima obukhulu ekudubuleni phantsi kweemeko ezikhanyiswe luzizi kunakwiindawo ezikhanyiswe kakuhle. Ukubuyekeza oku, iikhamera zihlala zinokukhanya kwe-infrared eyakhelwe-ngaphakathi, zisebenzisa izihluzi ze-infrared, zilungelelanise isantya sokuvala, okanye zisebenzisa uthotho lwezincedisi zesoftware. Ezi mpawu zongezelelweyo zineenzuzo kunye neengxaki zazo; nangona kunjalo, xa kuziwa ekusebenzeni kokukhanya okuphantsi, akukho ndlela inokutshintsha ngokupheleleyo indawo enkulu yokuvula.
Kwimarike, iintlobo ngeentlobo zeelensi zekhamera zokhuseleko zikhona, ezifana neelensi zebhodi ye-iris esisigxina, iilensi zokunyuswa kwe-iris ezisisigxina, iilensi ze-iris varifocal/ezilungisiweyo, kunye nebhodi ye-DC iris/CS iilensi zokunyusela, njl. njl. I-Jinyuan Optics inika uluhlu olubanzi. iilensi zeCCTV ezinemingxuma ukusuka kuF1.0 ukuya kuF5.6, ezigquma iris esisigxina, iris yesandla, kunye neAuto iris. Unokwenza ukhetho olusekwe kwiimfuno zakho kwaye ufumane ikowuteshini ekhuphisanayo.
Ixesha lokuposa: Aug-28-2024