Search Our Site with Google™   Search         Store       Products       Downloads       Demo       Support       Partnership       Contact Us   Software    Network camera    Video streaming    Video surveillance   Hardware   Multi-Camera Remote   Surveillance   Video capture card  How-to Guide         How do I select camera lens? 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 format 1/3"  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)