If mm is large, you can see images narrow and close, and if mm is small, you can see images far and wide.
It means the angle of view.
It depends on what kind of area you want.
The angle of view may also vary depending on the sensor adopted.
Choose wide angle (~4.5mm), standard (6~10mm), and telephoto (12~16mm) depending on your application.
- Select lenses by application
3~4mm wide-angle lens: wide-range monitoring
6-8 mm standard lens: cash counter, bank, etc
12~16mm Telephoto lens: Detailed monitoring of vehicle license plate, front of safe, etc
HD-class CCTV, manual zoom lens: wide range, narrow range
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