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What I mean is that if you image at f/10 you should guide at f/10 (1x) or f/15 (1.5x).. Strickly speaking it's not a direct mathematical relationship, but you get the idea.
Problem is if you guiding at f/5 and imaging and f/10 (as I do somethimes), every 1 pixel movement in the guide scope = 2 pixels in the imaging scope (assumming similar pixel size as I have). ideally you'd want it the other way round.
Cheers
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