Budewar ruwan tabarau, wanda akafi sani da "diaphragm" ko "iris", shine budewar da haske ke shiga kamara. Faɗin wannan buɗewa shine, mafi girman adadin haske zai iya kaiwa firikwensin kamara, ta yadda zai yi tasiri ga bayyanar hoton.
Faɗin buɗewa (ƙaramin f-lamba) yana ba da ƙarin haske don wucewa, yana haifar da zurfin filin. A daya bangaren kuma, kunkuntar budewar (mafi girman f-lambar) yana rage adadin hasken da ke shiga cikin ruwan tabarau, wanda zai kai ga zurfin filin.
Girman ƙimar buɗewa yana wakilta ta F-lambar. Mafi girman lambar F, ƙarami mafi ƙarancin haske; akasin haka, mafi girman adadin haske. Misali, Ta hanyar daidaita buɗaɗɗen kyamarar CCTV daga F2.0 zuwa F1.0, firikwensin ya sami haske sau huɗu fiye da da. Wannan madaidaiciyar haɓakar adadin haske na iya samun tasiri masu fa'ida da yawa akan ingancin hoto gaba ɗaya. Wasu daga cikin waɗannan fa'idodin sun ƙunshi raguwar blur motsi, ƙarancin ruwan tabarau na hatsi, da sauran abubuwan haɓakawa gabaɗaya don ƙarancin aikin haske.
Ga mafi yawan kyamarori na sa ido, buɗaɗɗen ƙayyadaddun girman girma ne kuma ba za a iya daidaita shi don gyara haɓaka ko raguwar haske ba. Manufar ita ce a rage yawan hadaddun na'urar da rage farashi. Sakamakon haka, waɗannan kyamarori na CCTV galibi suna fuskantar matsaloli mafi girma wajen yin harbi a cikin yanayin da ba su da haske fiye da yanayin da ke da haske. Don rama wannan, kyamarori yawanci suna da ginanniyar hasken infrared, suna amfani da matattarar infrared, daidaita saurin rufewa, ko yin amfani da jerin kayan haɓaka software. Waɗannan ƙarin fasalulluka suna da nasu ribobi da fursunoni; duk da haka, idan ya zo ga ƙarancin haske, babu wata hanya da za ta iya musanyawa gabaɗaya ga babban buɗe ido.
A cikin kasuwa, nau'ikan ruwan tabarau na tsaro iri-iri sun wanzu, irin su kafaffen ruwan tabarau na allo, tsayayyen iris CS Dutsen ruwan tabarau, ruwan tabarau iris varifocal / kafaffen ruwan tabarau, da ruwan tabarau na DC iris / CS Dutsen ruwan tabarau, da dai sauransu Jinyuan Optics yana ba da fa'ida. na CCTV ruwan tabarau tare da apertures jere daga F1.0 zuwa F5.6, rufe kafaffen iris, manual iris, da kuma Auto iris. Kuna iya yin zaɓi bisa ga buƙatunku kuma ku sami fa'ida mai gasa.
Lokacin aikawa: Agusta-28-2024