TrackIR : Fix for Light Interference

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I have been plagued by light pollution using my TrackIr even with the light threshold filter set to maximium. 

The solution is surprisingly easy. If you hack into an old floppy disk and cut out some of the storage medium you can tape that over the front of the camera and problem solved. The medium looks like a stiff circular piece of film negative.

This works beautifully with the Trackclip Pro, but does not seem to work with Trackclip.

I found this on another forum but could not see it in here, hence the post. 

For those born after the floppy died, I believe that using some nylon from a pair of stockings stretched over the camera  will do a similar job.