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There are GSO f5 imaging newtonian ota's available now at Andrews comuniations. I use an 8" f6 newtonian (fiberglass tube) for my astro snapshots and it seems to be fairly coma free. I optimised it by moving the primary mirror forward 50mm to achieve prime focus with a dslr. If I was going to use a full frame sensor camera I would have to fit a larger secondary mirror to avoid vignetting in the image.
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