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Light Sources
Keep these guidelines in mind when selecting and setting up light source:
•
LED light sources are relatively inexpensive, provide a uniform field, and longer life span compared to other
light sources. However, they also require a camera with excellent sensitivity.
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Halogen light sources generally provide very little blue relative to infrared light (IR).
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Fiber-optic light distribution systems generally transmit very little blue relative to IR.
•
Some light sources age such that over their life span they produce less light. This aging may not be uniform—
a light source may produce progressively less light in some areas of the spectrum but not others.
IR Cut-off Filters
Genie Nano-10G color cameras have a spectral response that extends into near IR wavelengths (as defined for
each sensor model in the sensor specification descriptions). Images captured will have washed out color if the
sensor response is not limited to the visible light band. To prevent infrared from distorting the color balance of
visible light acquisitions, use a "hot mirror" or IR cut-off filter that transmits visible wavelengths but does not
transmit near infrared wavelengths and above.
Guidelines for Choosing IR Cut-off Filters
The following graphic, using a color sensor response spectrum, shows the transmission response of typical filters
designed for CMOS sensor cameras. When selecting an IR cut-off filter, choose a near infrared blocking
specification of ~650 nm. Filters that block at 700 nm or longer wavelengths, designed for CCD cameras, are not
recommended for Genie Nano-10G color cameras.
For Nano-10G models, contact Midwest Optical for available IR cut filter fitting the M42 x 1 mm thread (example
part: M42x1C).
Midwest Optical Systems, Inc.
Office: 847-359-3550
Fax: 847-359-3567
https://midopt.com/
Nano-10G Series GigE Vision Cameras
Additional Reference Information • 147
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