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Thanks for the replies. I will try the focuser centring, it's an after market FeatherTouch but I fitted it, albeit with a coupler made by FT for the Williams, very soon after purchasing it. The scope is about 6 years old and to my recollection, has been like this from the start although I wasn't smart enough to recognise the distortion in the early days. I think I accept that I have to send it back so I'll make some enquiries with Williams.
Thanks again.
Charles
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