Focal Length Calculation
CR450x2
Full Sensor Resolution
The required focal length of the lens at full sensor resolution (800 x 600
Pixel) is calculated as follows:
7
,
17
B
1
A
]
mm
[
Length
Focal
+
=
A: Distance from lens to object in mm
B: Size of the object in mm
Object Size
Example:
A: Distance from lens to object = 300 mm
B: Object Size = 100 mm
calculated focal length = (300 : (1 + (100 : 17,7))) = 45 mm
selected focal length = 35 mm
Reduced Sensor Resolution
At reduced sensor resolutions (e.g. 600 horizontal x 400 vertical pixels)
the focal length is calculated as follows:
2
2
+
⋅
=
D
C
014
,
0
]
mm
[
Size
Sensor
CR Series
Ref. 1830-SU-02-G
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