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Sep30-08, 12:17 PM
Sci Advisor
HW Helper
P: 8,953
Didn't see it but you could imagine a capacitance position sensor, don't know if the mirror coating would be thick enough to give you much of a signal but you could sense the support metalwork.

Shoudl work well on Keck, a big problem on Mauna Kea (and most astronomical sites) is that it's so dry you get huge static build-up. You kill a lot of hardware and learn to touch car doors with the key before your fingers!