dmsummers wrote: Thanks for the BL report; I'll definitely check mine for comparison. What focal ratio are you operating at? It would seem that 84 counts on an EAF shouldn't produce that visible of an impact unless you're operating at low f ratio....but it's an interesting data point....so thanks for commenting!
That's on a Sharpstar 140, F/6.5. So not fast at all. 1 step corresponds to 2.8μ movement, so 84 steps is 0.235mm. That is a R&P focuser, maybe it just has a coarse gear ratio.
IIRC, around 30-40 steps of that BL are internal of the EAF, based on various forum posts here and there.
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