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There is a 'all in one' barlow system from Baader called a FFC. It is a small fluorite quadruplet that will give you anything between x3 to x8. I have been looking a long time at powermates and the like. Problem was the price for me so I bit the bullet and paid a bit more for this knowing it would give me more flexibility in choosing magnification, works with various scopes and has flawless colour correction if you use an OSC. Of course if you put it on a refactor it'd better be an APO. Still cheaper than buying an assortment of various powermates.
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