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thanks for the replies, one thought dawned on me today and that is that i haven't done a fresh polar alignment since installing the 8" RC.
it's pier mounted, but might be worth a try. The subs themselves were only 30 seconds in duration, so i wouldn't have thought that rotation would come into play here.
Someone on another forum suggested it could be as a result of tilt in the optical axis, so it might be worth me investing in a decent laser collimator such as the howie glatter, as my current hotech sca collimator might be giving me a poor reading when aligning the focuser on the optical axis
Rich.
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