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A p p e n d i x C : S e l e c t i n g a l e n s
For example, your Matrox Iris E-Series IE300has a 1/4" sensor chip size (which
uses a 3.6 mm vertical constant and a 2.7 mm horizontal constant). If there is a
52 mm distance between the object and the front of the lens (distance to the
object) and the object is 14 mm tall (vertical size) and 15 mm wide (horizontal
size), then the following calculations are used to determine the required focal
length:
×
3.6 mm
52 mm
----------------------------------------- -
14 mm
+
3.6 mm
In this example, a lens with a minimum focal length of 7.93 mm (vertical) is
required.
If the lens shipped with your Matrox Iris E-Series lens kit has a focal length equal
to the focal length of your calculation, you have the correct lens for your situation.
If the lens does not match the focal length of your calculation, you can still use it.
However, if your lens has a focal length smaller than your calculation, there will
be empty space around your object in the image. If your lens has a focal length
greater than your calculation, part of your object might not fully fit within the
image.
L e n s m o u n t i n g
When you choose a lens mount that is compatible with your Matrox Iris E-Series,
the image plane of your lens will be on your smart camera's image sensor. However,
if you choose another type of lens mount, the resulting image will always be blurry,
regardless of the focal length of the lens.
Matrox Iris E-Series is a CS-mount smart camera. To adapt a C-mount lens to a
CS-mount smart camera, you need a C/CS adapter ring. This adapter ring is about
5 mm thick and fits between the smart camera and the lens.
=
10.63 mm (rounded)
×
2.7 mm
52 mm
and
----------------------------------------- -
15 mm
+
2.7 mm
=
7.93 mm (rounded)
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