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Aperture rules. Go the 10" for the extra light gathering power, 1317 vs 840, a significant gain. An 8" is normally f6 and a 10" f5 so they are the same length more or less physically for only an extra 2" of girth. Ok, a little bit heavier and bulkier but if you're reasonably fit the extra aperture is worth it for visual neb views.
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