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How do I select camera lens?

ncc3_snapshot Video surveillance software
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If the camera is installed outside, it is recommended that you use auto-iris lens. Use the form below to quickly find out which lens is right for you.

Camera format1/3"  1/4" 
Object Distance ft.
Field of view    (Horizontal x Vertical)
    ft x   ft
Focal Length Needed  mm lens
1. Enter object distance
2. Enter horizontal or vertical view needed
3. Click the Calculate button to display
    focal length needed

4 mm lens (angle view: 72º) 6 mm lens (angle view: 43º) 8 mm lens (angle view: 33º)
(picture taken by BC602) (picture taken by BC602)