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How to choose lens of security cameras if you want to see human faces/car plate number clearly?

  • Author:Grace
  • Source:www.mvteamcctv.com
  • Release on :2017-07-27
Lens is the eye of security camera, it's one of the most important part of a security camera.  
Do you know how to choose lens to achieve different surveillance purpose? Such as see human face, human body contorus or human activities? If not, please refer to below table:
Resolution Focal Length (mm) See the details characteristics (Face/car plate) See the physical characteristics (Body contours) See the behavioral characteristics (Human activities)
D1 n n/2(m) n(m) 2*n(m)
720P n 0.75*n(m) 1.5*n(m) 3*n(m)
1080P n 1.5*n(m) 3*n(m) 6*n(m)
3MP n 1.5*n(m) 3*n(m) 6*n(m)
"n" represents focal length of lens, such as 3.6mm, 6mm,12mm etc. For example, a 2MP/1080P IP camera,with 6mm lens. The calculation result as below:
* See the face/car plate clearly at 9m(1.5*6m);
* See the body contours at 18m(3*6m);
* See human  activities at 36m(6*6m).
The 9m, 18m, 36m is distance from scene to camera.
How to choose lens of security cameras if you want to see human faces/car plate number clearly?
Are you clear about how to choose lens of security cameras according to  your demands now?

MVTEAM  is a manufacturer and exporter of all kinds of security cameras including AHD cameras, IP cameras, PTZ cameas, wifi smart cameras etc. If you have any inquiry about security cameras, welcome to contact us.

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