Micron Technology USB Camera - Manual (Page 74)

Basic Guidelines on Using the SMX-M8xx Series USB2.0 Cameras
70 SMX-M8xx Series USB2.0 Camera User Guide
Chart of the IR-cut filter transmission characteristics
When to Use the C-mount Adapter with IR-cut Filter
C-mount adapter with IR-cut filter use with the color cameras. Since the SMX-M8xx
color cameras are sensitive to IR-light, use the C-mount adapter with IR-cut filter for
the color camera models to make colors of the image more realistic.
Many light sources, including the sun, emit infrared light, so the color camera in daylight
will see a significant amount of infrared light without the IR-cut filter. As a result,
strange and non-realistic colors appear.
Another reason for using the IR-cut filter is the limited color correction for many lenses.
A lot of lenses have different depth of focus for the visible and infrared spectrum. The
IR-cut filter cuts away a significant amount of the overall collected light and thereby
affects the sensitivity in a negative way. In general, color cameras are one factor less
sensitive compared to monochrome (depending on the sensor). This is primarily due to
the IR-cut filter.