TF series lenses are specially designed to ensure the optimum performance of high performance 3-CCD/CMOS cameras
3-CCD/CMOS cameras are equipped with three image sensors. A thicker glass block than that used in a single CCD/CMOS camera is arranged between the lens and the sensor. When the same lenses as those for single CCD/CMOS cameras are used for 3-CCD/CMOS cameras, the camera performance may not be fully achieved. That is why special lenses are needed for 3-CCD/CMOS cameras.
Contrast recommends Fujinon lenses for use with their cameras.