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After my first serious dark sky session with 10 & 14mm XWs, I'd say the 10mm is the best match to the 12" Dob on DSOs. Seems to bring out the most detail, both on faint fuzzies like galaxies and planetaries and on larger brighter objects like the lagoon (although for framing such a large object you do need a lower power EP). If you get one premium EP, my vote would go to the 10mm XW. Field curvature of the 14mm might also be an issue. But this depends not only on scope and EP but also on observer's eyesight...
Downside of Tak LE's is that they only have a field of view equal to plossls.
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