Ukuvuleka kwelensi, okuvame ukwaziwa ngokuthi "i-diaphragm" noma "iris", imbobo lapho ukukhanya kungena khona kukhamera. Ukuvuleka kwalokhu kuvuleka, inani elikhulu lokukhanya lingafinyelela inzwa yekhamera, ngaleyo ndlela libe nomthelela ekuvezweni kwesithombe.
Imbobo ebanzi (inombolo engu-f) ivumela ukukhanya okwengeziwe ukuthi kudlule, okuholela ekujuleni kwenkambu engashoni. Ngakolunye uhlangothi, imbobo encane (inombolo engu-f enkulu) inciphisa inani lokukhanya okungena kulens, okuholela ekujuleni okukhulu kwensimu.
Usayizi wevelu yokuvula umelelwa inombolo ka-F. I-F-number enkulu, i-flux encane yokukhanya; ngokuphambene, inani elikhulu lokukhanya. Isibonelo, Ngokulungisa indawo yokuvula ikhamera ye-CCTV isuka ku-F2.0 iye ku-F1.0, inzwa ithole ukukhanya okuphindwe kane kunangaphambili. Lokhu kunyuka okuqondile kwenani lokukhanya kungaba nemithelela eminingana enenzuzo kukhwalithi yesithombe sisonke. Ezinye zalezi zinzuzo zihlanganisa ukufiphala kokunyakaza okuncishisiwe, amalensi anezinhlamvu ezincane, nezinye izithuthukisi eziphelele zokusebenza kokukhanya okuphansi.
Kumakhamera amaningi agadayo, indawo yokungena ingosayizi ongashintshi futhi ayikwazi ukulungiswa ukuze kulungiswe ukwanda noma ukuncipha kokukhanya. Inhloso ukunciphisa ubunkimbinkimbi bubonke bedivayisi kanye nokunciphisa izindleko. Ngenxa yalokho, lawa makhamera e-CCTV avame ukubhekana nobunzima obukhulu ekuthwebuleni ezimeni ezinokukhanya kalufifi kunasezindaweni ezikhanyiswe kahle. Ukuze kunxeshezelwe lokhu, amakhamera ngokuvamile anokukhanya okwakhelwe ngaphakathi kwe-infrared, asebenzisa izihlungi ze-infrared, alungise isivinini sokuvala, noma asebenzise uchungechunge lwezithuthukisi zesofthiwe. Lezi zici ezengeziwe zinobuhle nobubi bazo; kodwa, uma kuziwa ekusebenzeni kokukhanya okuphansi, ayikho indlela engashintsha ngokuphelele indawo enkulu yokuvula.
Emakethe, kukhona izinhlobo ezihlukene zamalensi ekhamera yokuvikela, njengamalensi ebhodi e-iris agxilile, amalensi okukhweza e-iris CS, amalensi agxiliwe ama-iris varifocal/fixed, kanye namalensi e-DC iris board/CS mount, njll. I-Jinyuan Optics inikeza ububanzi obubanzi. yamalensi e-CCTV anezikhala ezisuka ku-F1.0 kuye ku-F5.6, ezimboza iris engaguquki, iris yesandla, ne-Auto iris. Ungenza ukukhetha ngokusekelwe ezidingweni zakho futhi uthole ikhotheshini yokuncintisana.
Isikhathi sokuthumela: Aug-28-2024