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Thanks Sash.
I've tried the full set of collimation eyepieces, Glatter Laser, Tak scope etc. and I think Casstony has the right idea. The stellar distortion does suggest pinched optics. I asked Williams for suggestions and when I told them the purchase date and supplier, they just told me to send the lens cell back to them. Quote to fix + return freight is $US240 so, not bad at all. I'll send it off next week when go down to Adelaide.
Thanks for all the help.
Charles
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