[Tony_ (Tony)]

Thanks for your help everyone - but I still am not sure how to fix it.
I cleaned the corrector plate and took some pictures tonight - same result.
Seeing conditions weren't that good - but I have taken shots through light clouds/moisture before and the result didn't look like this (stars were fuzzy).
I didn't have this problem same time last year - now I have it every time.

Maybe it is as simple as focus - but surely I would get the focus close enough occasionally? Also the stars with the dot in the middle and the circle around it isn't what an out of focus star looks like? The camera sensor is clean, the primary and secondary mirror look clean.

Maybe it is just the weather? - but I guess other people in Victoria with SCTs aren't having the same problem. If the secondary mirror isn't in the correct rotational position - could this cause this problem (I doubt it ... but I'm getting desperate)

What else can I try, apart from focus? Any ideas.

Regards,
Tony.