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The ES 68° 16mm is a good performer. The view is surprisingly expansive for such a small unit. Eye relief is tightish though - similar to T6 Naglers or the 15mm Plossl.
For a medium power EP I'd consider something around the 20mm mark. I do find the 2mm exit pupil thing works very well for me. The major globs should look pretty good in an 8" at 100x, I guess it depends which globs you want to resolve - lots of options between Palomar globs and Omega Cen. An 18 or 20 would be sufficiently different from the 9 too.
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