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thanks very much for all that info Clive.
the CalPoly 18 altaz scope is really impressive, particularly the drive system accuracy and resolution.
I guess that the optical quality of the big HO mirrors is likely to be quite suitable for imaging - the amosphere will totally dominate the resolution at such large apertures. The surface roughness may be an issue for image cosmetics (stars with halos for example), but it might be possible to live with that as a tradeoff for getting lots of photons.
Lots to think about - thanks again. Regards Ray
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