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Hi Kirkus
The guide scope should have a good, quality, rigid focuser to ensure that the guiding CCD camera does not flex the focuser on the guide scope when the “weight” changes as the mount tracks. The draw tube should ideally have a focus lock screw to prevent the focuser slipping under the weight of the guide camera (if it is reasonably heavy).
Any flexure in the guide scope system may still give you nice, round guide stars in the guider CCD camera, but your imaging camera on the imaging telescope will not know about this and may result in trailed stars.
Cheers
Dennis
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