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From what I have read, if you plan to go down the path of absolute encoders they really should be at point of manufacture. Something to do with optical alignment (referring to the encoder here, not the telescope) really needing to be factory set and not just an addon in the field.
Without finding some unbiased information its hard to tell how reliable it is. Cannot exactly remember where I read it (was when I was looking into a new mount) but it could very well have been information against those companies looking at having addon absolute encoder (AP & Bisque) as opposed to factory set, aligned and built in (Planewave, Astrosysteme Austria plus a couple of others that offer this).
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