In most builds you want to go with an m12 lens setup, though the CS lenses do allow more light to hit the sensor and are typically made of higher quality glass optics. The mm number of the lens relates to the focus distance and thus the field of view (FOV) of the lens. The smaller the mm number, the larger the FOV (the larger mm the more FOV). The more FOV you have the more barrel/curved distortion you will have in your image. More distortion means the light passing through the band pass filter will be shifted outside the very narrow nm band of light being allowed to pass through to the camera sensor. This means less bright blobs at the edges of your touch screen and makes calibration in the tracking program (CCV) more difficult (if not impossible in very distorted setups). Thus, you want to always minimize the distortion so that you get the most light to the sensor, and bright even blobs over the entire surface.
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