Mass production optics are put to the lowest bidder. Skywatcher is made for the general astronomer not the more serious astronomer. Middle of the road stuff. Skywatcher is great for people like Myself and others that try to push the boundaries of a lower class scope.
SDM and TAK and minority others are designed for more serious observers or AP'ers.
SEBEN (Sperical Mirrors) on the other hand are for newbies that most will buy and then give up, not fancy but cheap.
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