• Accessories
  • Access Control
  • Amplifiers
  • Audio
  • Batteries
  • Cable
  • Camera Brackets
  • Connectors
  • Ground Loop
  • Helpful Tips
    • 01. Typical Illumination Levels
    • 02. Calculation of focal length
    • 03. How to back-focus a camera
    • 04. CCTV Monitor vs TV with Video-Input
    • 05. PC Based DVR vs Stand-Alone DVR
    • 06. Advantages of Digital CCTV
    • 07. Points to consider when designing a CCTV System
    • 08. Installation Tips
    • 09. Identification Using CCTV
    • 10. Factors Effecting Camera Sensitivity
  • Infra-Red Illuminators
  • Lightning/Surge Protect
  • Monitors
  • Power Supplies
  • RS485 Distribution
  • Serial Converters
  • Signs
  • Switching Units
  • Tools
  • Twisted Pair
  • Video Analytics
  • Video Converters
  • Video Overlay

02. Calculation of focal length