On the 127mm Mak that I got a week ago, I've been happily using a 25mm Plossl and the wider 60 degree FOV Meade 25mm HD eyepiece - since they come closest among what I have of delivering the 2mm exit pupil that I want for DSOs.
The best eyepiece for it would obviously be the 24mm Panoptic, which gives exactly a 2mm exit pupil, but I could never bring myself to spend more on the eyepiece than I did on the telescope tube.
The good thing about long focal length telescopes is that otherwise average wide angle eyepieces still look reasonably good in them.
Regards,
Renato
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