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Not the same scope, but I found the Astrotech 0.8 FF/FR to work quite well on my Explore scientific ED80, and it didnt cost a fortune. Having said that, the ES ED80 is f6 while the SW ED80 is f7.5, and the Astrotech is designed for f6. It says that it will work up to f7, but f7.5 would probably be pushing it.
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