Calculating the required focal length 77
Calculating the required focal length
To calculate the required focal length, measure the distance from the smart camera
to the object, as well as the height (vertical size) and width (horizontal size) of the
object.
Use the following calculations to determine the required focal length for your
situation.
By selecting the smallest focal length from the vertical and the horizontal focal
length calculations, you ensure that both the vertical and horizontal dimensions
of your object fit within the view of your lens.
The model of your smart camera determines the horizontal and vertical constants
required in the above-mentioned calculations.
and
Model Horizontal constant Vertical constant
GTR300, GTR300C 3.0 mm 2.3 mm
GTR1300, GTR1300C 6.1 mm 4.9 mm
GTR2000, GTR2000C 9.2 mm 5.8 mm
GRT5000, GTR5000C 12.4 mm 9.8 mm
Matrox Iris GTR
Lens
Distance from object
Height of object
Object
Vertical constant Distance from object×
Vertical size of object Vertical constant+
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Horizontal constant Distance from object×
Horizontal size of object Horizontal constant+
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