I think people can count themselves very fortunate to have any of these eyepieces. Nagler Pentax or any high end ones.
But for this exercise and I have used all the Naglers mentioned, bar the 16mm.
I liked the 31 for it's huge field. The 20mm Is a super eyepiece.
Also I liked the 11mm and 5 mm Nags. But there all about the same in the smaller focal lengths.
Depends on your scope and focal length of your scope.
My friend uses a NP101 and uses the 2.5 mm and 3.5 mm often. He loves them and that's all that matters.
Enjoy whatever EP you have.
