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There are already some very successful short focus large Newts around with Australian made optics too, including a current project of a 24" F3.5 mirror for a Canberra syndicate.
Fast mirrors, apart from higher production tolerances place greater demands on the rigidity of structures like diagonal spider and cage. The coma corrector can only work properly if the optical axis can be held very precisely to the optical axis of the Paracor.
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