CamPerform CP80-3-M/C-540
Ref. 1888-SU-01-C
Page 26
Focal Length Calculation
Full Sensor Resolution
The required focal length of the lens at full sensor resolution (1696 x 1710
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 : 19,27))) = 48 mm
selected focal length = 50 mm
Reduced Sensor Resolution
At reduced sensor resolutions (e.g. 1200 horizontal x 1200 vertical pixels) the
focal length is calculated as follows:
27
,
19
1
]
[
B
A
mm
Length
Focal
+
=
Object Size
2
2
008
,
0
]
[
D
C
mm
Size
Sensor
+
⋅
=
