計算ip camera viewing angle公式

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1/3"      CCD will have a wider viewing angle(15°more) than 1/4" CCD.In general,      2.5mm~2.8mm is suitable for shooting distance that is less than 15 ft      CCD size and Lens focal length will affect the viewing angle. The following      table is a summary of viewing angle for different CCD and Lens.
      
                                                                          

	1/4" CCD (Dome type)	1/3" CCD (Dome type)	1/3" CCD (Standard type)
2.5mm	95	130	120
3.6mm	70	90	-
4mm	-	-	70
4.3mm	60	80	-
6mm	50	70	53
8mm	35	50	40
12mm	25	30	25
16mm	20	25	20
25mm	9	15	12

      
      To select a suitable lens please follow the following steps <A>      Measure the distance between the camera and the shooting target. We call      this the viewing distance--L <B> Measure the viewing width--W. Use      the following trigonometric formula to find out the viewing angle.           Viewing angle = 2 * Arc tan (W/2L)