Monitor the difference between the lens of the millimeter
The size of the scene is u = 4.8mm, h = 6.4mm. U, this relationship is determined by the camera viewfinder CCD chip).
The lens angle of view of the scene is a very important parameter, the lens field angle with the lens focal length and camera size changes (the relationship between the changes described above), covering the scene lens focal length
These are the parameters of the lens we often hear. This parameter determines the range and distance of the camera, the smaller the value, the wider the range to be captured, the shorter the distance; the greater the value, the smaller the range, the longer the distance.
