Quote:
Originally Posted by ausastronomer
At the price point of these mega resolution magnetic encoders used on amateur telescopes (very cheap ); it's highly likely that radial and axial alignment errors and concentricity errors of the encoder disc itself will offset any gains that may have been achieved by any additional rotational resolution gains of the encoder itself. Mechanical alignment errors of a few microns even will swamp any gains by the extra rotational resolution of the encoder itself. To the extent in fact that its quite possible that in the field a high quality 10k or 32k encoder might outperform some cheaper > 100k encoders.
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John, those encoders are priced approximately at the same level as 32K or 40K encoders from US Digital.
By the way, the encoder I use on altitude of my telescope (18" SkyWatcher) gives me the accuracy of ~12 seconds of arc. These encoders do not require any tangent arms for the altitude.
Also, you will find that US Digital do not provide the accuracy of their encoders.
Having higher resolution encoders allows for much higher accuracy if using a local sync as well - that is even if there are mechanical issues with the telescope.
Best Regards,
Serge.