A varifocal CCTV lens imhando yekamera lens inobvumira kuchinjika kwakatarisa kureba kugadzirisa. Izvi zvinoreva kuti iyo lens inogona kugadziridzwa kuti ipe akasiyana ekuona kona, ichikubvumidza iwe kuswededza mukati kana kunze pane imwe nyaya.
Varifocal lenses anowanzo shandiswa mumakamera ekuchengetedza nekuti anopa kuchinjika maererano nemunda wekuona. Semuenzaniso, kana iwe uchida kutarisa nzvimbo yakakura, unogona kuseta lenzi kune yakafara kona kuti utore yakawanda yechiitiko. Neimwe nzira, kana iwe uchida kutarisa pane imwe nzvimbo kana chinhu, unogona kuswedera pedyo kuti uwane kutarisisa.
Kuenzaniswa nemalenzi akaiswa, ane imwechete, static yakatarisa kureba, varifocal lenses inopa humwe hunyanzvi maererano nekuiswa kwekamera uye kuvharwa kwechiitiko. Nekudaro, iwo anowanzo kudhura kupfuura akagadziriswa lenzi, uye anoda imwe gadziriso uye calibration kuti ive nechokwadi chekushanda kwakakwana.
Kuenzaniswa ne apafocal(“yechokwadi”) zoom lens, iyo inoramba yakatariswa sezvo lens zooms (yakatarisana kureba uye magnification shanduko), varifocal lenzi ikhamera yekamera ine inosiyana yakatarisa kureba umo chinotarisika chinoshanduka seyakatarisa kureba (uye magnification). Mazhinji anonzi "zoom" lenzi, kunyanya kana ari akamiswa-lens makamera, ari iwo arifocal lenses, ayo anopa vagadziri velens kuchinjika mune optical dhizaini yekutengeserana-offs (yakatarisana nehurefu hwakareba, yakakwira aperture, saizi, uremu, mutengo) kupfuura parfocal zoom.