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thanks brendan, perhaps the collimation is the likely factor. i discovered the mirrors centre spot is not actually in the centre, also suspected that the critical focus was tighter than the factory focuser can adjust to.
the ambient temp is not the problem, the scope has been cooling for three or four hours usually. seeing and collimation are the culprits.
thanks everyone.
Logieberra, powermates have the 1.25" thread on the bottom.
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