Thanks for that Borg info. When I had a quick look at the AEC website on Borg I got the feeling that it was even more confusing to figure out (in adapters) than the Taks!
After some more exhaustive reading I may slowly moving towards the FC-100DF. Using it exclusively for visual I don't need anything more than a well corrected doublet. Prefer it being lighter with faster cooling and not quite so front heavy. Can always put a W extender to bring it to F/11ish.
Still a little way off making a decision.
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