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Hi Graham,
I just got back from a three day astronomy inservice which was fantastic. The guide scope I use is a williams optics 70mm. The mount handles this no problems. To give an indication I mount a 12" Dob on it and it handles that fine but I wouldn't go any further. I do not have a field flattener but will invest in one soon. The photo of centaurus A is 8 x 10 Min lights with 3 x 10 Min darks. No flats or bias frames applied.
Good luck with your purchase.
Mark
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