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Thanks guys, comments appreciated.
Jase and Moon, looking at it I think it might be camera tilt. I tested for differential flexure last night. At the zenith the subs looked the same as the subs near the horizon. That said it could be still a small amount of flexure mixed with tilt. When I get the OAG focused this should sort any flexure out. If it is tilt how do I sort this out? I have a feather touch focusor which might have some adjustment on it.
Jase I used masking for the core regions ot prevent burn out. I have been using the techniques on Ken Crawfords site. Seems to work quite well.
Thanks for the link Moon (sorry I think your name is James) I read up and see what is has to say in full. Just did a quick scan.
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