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For a 10" LX200 you're looking at 192x, 8" is 154x. Unless you are into faint planetary nebulae, it's probably too much power. If it were me, the 17mm T4 would the choice. It has a tad more True FOV and more suitable mag. The 20mm T5 or the 22mm T4 are also very good. I have the 22m T4, but the 20mm T5 is probably slightly better corrected, but with somewhat tighter eye relief.
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