Clever. Seems obvious in retrospec though. It reminds me of collimating a telescope with a laser or your eye. You basically look down the optics of the telesco

Clever. Seems obvious in retrospec though. It reminds me of collimating a telescope with a laser or your eye. You basically look down the optics of the telescope and you should be staring into your own eye, or if you use a laser the laser should be reflected by the mirrors exactly back into the emitter.