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Hi Robert
I have an old VC200L which is the Vixen 200mm f9 VISAC that uses a built in three element corrector located in the baffle near the eyepiece end.
It is a very nice ‘scope (or was until fungus got onto the primary and corrector) but it falls some way short of the Mewlon 180 in terms of star testing and contrast.
Cheers
Dennis
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