How to Choose CCTV Focal Length for 5ft to 1.5m Coverage?
What focal length is best for CCTV coverage at 5ft/1.5m? A 2.8mm-4mm lens provides 80-100° viewing angle ideal for monitoring 5ft-1.5m zones like retail displays or entryways. For 10-inch facial recognition, use 6mm+ lenses. Match focal length to sensor size …