Surveillance Camera 123. Detect a human up to 182 yards away (1.5 pixels on target). Detect a Vehicle 559 yards away (1.5 pixels on target). Horizontal Viewing Angle 35.4 degrees. Focal length of 4 mm. Human Permiater with Tripwire. Detect a human up to 45 yards away (6 pixels on target). Detect a Vehicle 139 ...