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According to person I know the quality assurance
is a bit lacking concerning the mirrors on the 10 inch GSO RC.
It's very difficult to grind two, accurate, hyperbolic mirrors.
Out of 3 scopes tested for focus -
one was excellent,
the 2nd wasn't quite as good but still acceptable &
the 3rd was a bit blurry.
Can you return them if you think the focus isn't tight enough?
I don't think so.
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