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Fahim,
if that is the case then it is likely to be a production related issue. Maybe the Vixen mirrors are not all the same quality. Whether this is the case or not the RC design is supposed to be sharper but less contrast by virtue of the optical designs of each telescope.
Personally I think having a shoot out is meaningless exercise. One would have to use exactly the same equipment on several telescopes to get a meaningful comparison. That is never going to happen.
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