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What sort of cost John? Why I ask is this, I have an 8" f4 newt, and it requires a Baader MPCC, but there is no CA as you will understand. All up I guess it was significantly less that what I imagine even a decent achromat will cost? OK, in this I figure a top quality focuser as well, but this will be in the mix regardless, so the basic scope(s) should be compared.
Does this make sense?
Gary
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