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The AO does most of the work but every so often the guide star will wander too far for the AO to correct (the optical element will only tilt so far) and then the guide software should detect this and do a mount "bump". This means a short slew to get the guide star back in the right place with the AO element brought back to its central position. If you have extremely good polar alignment and a mount that tracks accurately then you might never need a bump.
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