I also have an Orion XT8 dobsonian and am looking to upgrade from the stock eyepieces. Living under bortle 6, maybe 7 skies means this thread is really relevant and useful. I was planning on going for a couple of BSTs but I've seen you say good things about the 82° Nirvanas so, based on your advice of going higher mag complimented by wider FOV, I think I'd be better off going for the 16mm for DSOs. Before I part with my money I just wanted to check that it would be decent (I say decent as I'm being realistic with the sub £80 price tag) at f5.9, I think you have experience of the Nirvanas at f6? Any advice would be much appreciated.