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I'm far from an expert - but I would estimate with a Mach1 mount and a 400mm FL guidescope, you can expect much better values than you've quoted.... with PHD1 I improved guiding with decreasing RA aggression, increasing hysteresis, incr exposures from 1s to 2s, and improving polar alignment....
Sometimes in poor seeing, the graph with bump everywhere regardless....
the multipixel deviations (I call them b@stards) may be from cable dragging, wind, crud in the mount... or just guiding gremlins....
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