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Guidescopes and guiding a short guide.If you are guiding with a toucam say and Guidedog your guiding accuracy is sub pixel.Even if its not say one pixel about five micron.If the guidescope has a focal length of 300mm say,the accuracy is still better than one thousanths of a degree.The fallacy of needing a long focal length guidescope was due to the need for manual guiding and we humans are not good at it.The best bet get the biggest aperture never mind the quality and you will always find a guidestar.My 300mm F4 achromat guides a 2000mm telescope very well.
Bert
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