Monoprice 107546 1/3-Inch IR F1.2 Varifocal Manual Iris CS Mount Lens with IR Correction, 3-9mm Fixed Lens for Other Cameras Monoprice precision optic camera lenses for CCTV cameras allow crystal clear images to be recorded by your security cameras This 1/3" CS-mount lens is a great simple solution to use R corrected lenses employ specialized optical elements