Optronis CP80-4-M/C-500, User Manual

Page: 37 / 52

CP80-4 ; CP90-4 Ref. 1887-SU-01-H Page 35
Focal Length Calculation
Full Sensor Resolution
The required focal length of the lens at full sensor resolution (2304 x 1720
Pixel) is calculated as follows:
A: Distance from lens to object in mm
B: Size of the object in mm
Example:
A: Distance from lens to object = 300 mm
B: Object Size = 100 mm
calculated focal length = (300 : (1 + (100 : 20,126))) = 50 mm
selected focal length = 50 mm
Reduced Sensor Resolution
At reduced sensor resolutions (e.g. 1920 horizontal x 1080 vertical pixels) the
focal length is calculated as follows:
2 2
007 , 0 ] [ D C mm Size Sensor
  
126 , 20
1
] [
B
A
mm Length Focal


Object Size