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Cameron,
Very close to the 21 13 8 FL's you mention, I use the ES 100º, 20 14 and 9mm on my 150 f8 refractor. Put em with a 2X 2" barlow and it's a terrific combo. Have had the 5 and 8mm Hyperions with the two tuning rings and while nice in theory the rings are really a waste of space. I never ever used them.
Matt
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