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Ive been wondering about this design for a while now, putting aside the overall usefullness arguement, it appears the output encoder is used primarily as a speed feedback device (digital tacho) to achieve very low PE, rather than for absolute positional accurracy, which would require a much higher resolution encoder, as used in expensive pro rigs (hence my apprehension earlier on the cost of the encoder).
Great if thats the case and it appears to work, smart idea, but then it doesnt improve pointing accurracy, not that matters perhaps, dont know. I also wonder, since it doesnt rely on absolute position for calculating tracking accurracy, whether it might suffer long term drift?.
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