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Thanks David. I'm imaging at 1250 mm and guiding at 500 mm. I've also heard the 2x rule but thought the CCD guiding system was capable of sub-pixel accuracy such that this wasn't an issue.
After reading another thread on guiding I'm wondering if my guide star wasn't bright enough for accurate centroid determination. I've been using the star brightness chart in Guidemaster to adjust the number of stacked frames to ensure the chart doesn't max out. There is no reference to the chart in the instructions but I guess it is possible that it needs to be at the top of the chart to be bright enough.
Peter.
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