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Just to further reiterate what Profiler has mentioned (and to the thread he linked that I wrote), I have now extensively tested the new Sphinx SXW firmware on my own SXW and can report not a single Dec jump, spike or non-commanded movement in over a 6 hour tracking session - all sub frame exposures exhibit no evidence whatsoever of spiking.
In fact, the SXW's now track and guide SO well I am using mine for long exposure (>10 minute sub) imaging with my 100mm refractor.
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