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Another way to put it is if you move in one direction RA or Dec, then stop then go to move in the opposite direction the mount does not move straight away, until the gears take up the slack and start moving, this pause is the backlash. Almost every mount will have this. the Backlash settings on your mount are so the motors spin in the opposite direction a little bit, just to take up that slack.
Its not really necessary to adjust this if most of your movements are in one direction, but it can cause GOTO's to become less precise the more you movethe mount from one direction to the other.
Most backlash settings are corrected at the time of manufacture so each mount is factory set.
If its not a major problem I wouldnt bother adjusting it until you feel comfortable with doing so. You can make your gotos worse if the backlash settings are incorrect.
Hope this helps a little.
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