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

Grace www.mvteamcctv.com 2017-07-27 12:00:46
  
Resolution Focal Length (mm) See the Details Characteristics (Face/car plate) See the Physical Characteristics (Body contours) See the Behavioral Characteristics (People 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)