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With any of these cheap but fancy designs I suggest you buy from a shop that will allow return or exchange if you aren't happy. Most of them will have one or more design flaws that may or may not bother you. I purchased a 6mm Orion Expanse clone from Andrews and promptly exchanged it due to severe ghosting on the moon (in a Chinese 80mm f/5 refractor). Had I not wanted to view the moon the eyepiece would have been fine.
Tony
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