I-Closed circuit TV (CCTV), eyaziwa ngokuba yi-video surveillance, isetyenziselwa ukudlulisa imiqondiso yevidiyo kwiimonitha ezikude. Akukho mahluko ukhethekileyo phakathi kokusebenza kwelensi yekhamera engashukumiyo kunye nelensi yekhamera yeCCTV. Iilensi zekhamera yeCCTV zizinzile okanye zinokutshintshana, kuxhomekeke kwiinkcukacha ezifunekayo, ezifana nobude be-focal, i-aperture, i-angle yokujonga, ukufakelwa okanye ezinye iimpawu ezinjalo. Xa kuthelekiswa nelensi yekhamera yendabuko enokulawula ukuvezwa ngesantya se-shutter kunye nokuvulwa kwe-iris, ilensi yeCCTV inexesha lokuvezwa elimiselweyo, kwaye ubungakanani bokukhanya obudlula kwisixhobo somfanekiso bulungiswa kuphela ngokuvulwa kwe-iris. Izinto ezimbini ezibalulekileyo ekufuneka ziqwalaselwe xa ukhetha iilensi bubude be-focal obuchazwe ngumsebenzisi kunye nohlobo lolawulo lwe-iris. Iindlela ezahlukeneyo zokufaka zisetyenziselwa ukufaka ilensi ukugcina ukuchaneka komgangatho wevidiyo.
Iikhamera zeCCTV ezininzi ngakumbi zisetyenziselwa iinjongo zokhuseleko nokujonga, nto leyo enefuthe elihle ekukhuleni kwemarike yeelensi zeCCTV. Kwiminyaka embalwa edlulileyo, kubekho ukwanda okukhulu kwemfuno yeekhamera zeCCTV kutshanje njengoko iiarhente zolawulo ziye zamisela imithetho enyanzelekileyo yokufakwa kweekhamera zeCCTV kwiivenkile ezithengisa izinto, iiyunithi zokuvelisa kunye nezinye iimboni ezithe nkqo ukuze zigcine iliso imini nobusuku kwaye ziphephe imisebenzi engekho mthethweni. Ngenxa yokwanda kwenkxalabo yokhuseleko malunga nokufakwa kweekhamera zethelevishini ezivaliweyo kwiindawo ezisetyenziswa ekhaya, ukufakwa kweekhamera zethelevishini ezivaliweyo nako kukhule kakhulu. Nangona kunjalo, ukukhula kwemarike yeelensi zeCCTV kuxhomekeke kwimida eyahlukeneyo, kubandakanya umda wentsimi yokujonga. Akunakwenzeka ukuchaza ubude becala kunye nokuvezwa njengeekhamera zemveli. Ukusasazwa kweekhamera zeCCTV kuye kwasetyenziswa kakhulu eMelika, eBritane, eTshayina, eJapan, eMzantsi Asia nakwezinye iindawo eziphambili, nto leyo eye yazisa iimpawu zokukhula okunamathuba kwimarike yeelensi zeCCTV.
