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Guiding Focal length
Mick,
Guider FL only needs to be a good proportion eg 75% of the main OTA.
Even less if you are using an autoguider. I have used just a 250mm lens to accurately guide a 1200mm scope.... This is due to the fact many autoguiders make sub-pixel corrections.
More of a problem is differential flexure which may become apparent after just 5 minutes of guiding with long FL system.
Have a good one
Peter
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