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the problem with a relatively fast 5 inch will be CA. There are only a couple of refractor designs that seem capable of keeping the spot size within the diffraction region over much of the visible spectral region. For narrowband though, it should be a reasonable approach. Better bet might be a 6 inch fast Newtonian with a decent coma corrector.
Last edited by Shiraz; 26-11-2016 at 10:22 PM.
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