What's the difference between 2.8mm & 3.6mm lenses?
Which Lens Should I Select
TVI Outdoor IR Turret CCTV Camera w/ 3.6mm Megapixel Fixed Lens
Which is better - a surveillance video camera with a 6mm lens or one with a 3.6mm lens? - Quora
Security Camera Lens Size Comparison
Should I Use a 2.8mm or 4.0mm Lens? | XLR Security
HD 1080P IP WIFI Camera Wireless Dome Camera Audio IR 20M Night Vision 3.6mm Lens 2MP Security CCTV Camera P2P CamHipro - AliExpress Security & Protection