Mark,

All the ZAO II are excellent I use them in the 48" all the time they are my workhorses . I have the set of ZAO II 16MM,10MM, 6MM and 4MM. but no eyepiece has the light transmission of the TMB supermono, I have the 5MM, 7MM, 8MM, 9MM and10MM, in my scope you can easily see the gain in light grasp of the TMB supermonos. If I were you I would try to get a low count Ortho or SuperMono in a 2mm exit pupil and 1.5 mm exit pupil that is what shows the Faint fuzzies the best from my experience.

Good luck they are hard to come by. APM Telescopes Germany is making a run of high in orthos now so check Markus out you might still be able to get on the list. Maybe Dragan will jump in here he is on the list.