Here's a page showing different eyepiece designs that you might find interesting:
http://members.shaw.ca/quadibloc/science/opt04.htm
With modern coatings I think the number of eyepiece elements isn't a problem, but getting an 11 element eyepiece to perform well would be costly. My type 4 nagler has coatings that are noticeably higher transmission than my type 1 nagler, and the latest Televue eyepieces are reputably better again. (Qualification: you're not challenging a great mind here
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