CCTV cameras come with a range of lenses designed for different applications. When you only see a lens size this makes it tricky to know which one you need for you site.
This video shows the visual difference between three popular lens sizes:
• 2.8mm for a wide view
• 4mm for more clarity at distance
• 6mm telephoto lens
Hopefully this will help you to work out which one is most suitable for you.

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