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Brian, spot on-
'With the extender it is a super APO- converging the colours; even increasing the Strehl' and ... 'this is not a criticism of the scope but emphasises that the scope is 3 scopes in one satisfying all purposes'.
People think the Extender-q is a simple barlow, which it's not! Hence the reason for my post, above, 'it's an essential visual and AP tool for those scopes'.
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