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Yes I was sold a dud telescope and no I wasn't implying that a CDK design would lead to poor performance. Perhaps my original statement was misleading, what I meant to say was that poor quality in manufacturing resulted in poor performance.
I have the design specs of the proto type which state it is a CDK and amongst other things the decentration and spacing tolerances.
I have also been informed that even the slightest decentration of either the primary and secondary mirrors is disasterous to performance.
As much as I would like to show the design specs in detail, they are not current, and I have learnt (as have the administrators of this group), this particular manufacturer has a very itchy finger in threatening people with legal action (which was why my original article was removed).
If you're interested in the design and what it is called these days I suggest you contact Damien Jones at Prime Optics.
Regards
Steven
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