Gday Fred
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Andrew. OK, if its not a true output encoder, then that changes every thing, Id be very wary
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Not necessarily wary, it does what it says, to a point.
If we assume it has a precision gearbox between the RA axle and the encoder, any PE in this is simply tested for and accounted for,
This could be done as a factory setup.
Thus, when in place and running, this gizmo would give a good "smooth and steady" tracking rate, thus removing a lot of the std problems seen with high freq PE and tooth spacing errors.
However, unless there is a true sky feedback mechanism, it cannot ever give a "perfect" tracking, "for taking piccies"
Also, look at how it gets fitted to a Meade Fork unit
No more swinging the OTA between the forks
Andrew