Gday Mark
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Andrew the TDM by passes the worm completely and is fixed directly to the RA shaft itself.
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Understood fully, but all i am saying is, on a cost benefit analysis,
can a much cheaper encoder on a worm + PEC be equivalent to a really expensive encoder on the output axis of an average quality mount???
Any mount designed from the ground up with a direct drive motor and an integrated hi prec encoder "should" always have the abilty to outperform a TDM retrofitted to a crappy mount.
Horses for courses.
Andrew