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Saw it earlier. Stupid price IMHO. Its still only a 10", and there's nothing magical about a mak that is going to beat the seeing limitations.
The spot aluminised on the secondary is the Gregory Maksutov design. The designs with a secondary whose radius can be different to that of the rear surface of the corrector is the Rumak design, and this provides two more degrees of freedom to correct aberrations. Given the quality of their work I'm not surprised they used the Rumak design on a mak this large.
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