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Hi there Roobi,
I have an old 4.7mm nagler type 1 which is just superb although eye relief is intolerable for me now without a barlow. I think I read that Al Naglers personal choice is to use a 4 inch Televue refractor with his 3-6 zoom for planetary viewing - so it cant be too bad (pretty damn fantastic I'd say). Compared to multiple fixed fl eyepieces it might not look so bad.
Limitations would be the short eye relief and narrow field of view - plossl like (how good is your tracking at high power?).
The theory might say 50x per inch but I know I have had my refractors past this with good results when seeing permits. Luke Dodd had his 5 inch astrophysics refractor also up at around 80x per inch easily and I can vouch for the fact that the results were superb. Optics would no doubt make the difference (someone will probably show me the theory now saying its just not possible!).
Clear skies
David
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