Lowenbrau

I have actually used 13 and 17 mm Hyperions but not on faster than f/6 so can't know before trying. Will go for some higher class anyway. Didn't have problems although I understand it might be an issue in higher power eyepieces.

What confuses me know, when I read about Hyperions and fast scopes here, that they market it as a such eyepiece, what many people on other forums confirm. Actually only here I read that they're not behaving well in fast fs, when I was thinking of getting one 8mm for my f/4.5 dob.

Only thing that really worry me is big glass diameter compared to exit pupil which would mean lot of blackouts and uncomfortable use, but it's the same story with other premium eyepieces of the comparable FL. Maybe something like Takahashi LEs might be ultimate solution...