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Hello,
With the 66degree eyepieces I seem to remember that the 6 and 9mm are well worth while getting, the other two less so. You might be better off with a 18mm Starguider (or sim.) for $75 for the mid range. Anything under 10mm and a TBM II is worthwhile at $50+ dollars, only 50degree or so though.
Plenty of reviews for the 66 degree eps around, just check to see how they work for your telescope's focal length first.
With your 40mm that would fill in the gaps pretty well, assuming it came with a 25mm ep.
Steve
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