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The 22mm Nagler needs a Paracorr to perform well in a Dob; the edge of field is poor otherwise. From memory I also had trouble seeing the whole field of view at once in other types of scope due to a curved exit pupil.
The ES 24mm or the discontinued Axiom 23mm are decent and cheaper alternatives.
As Matt says the Nagler 31mm is more or less perfect though all longer focal length eyepieces benefit to varying degrees from a Paracorr. Once again the ES 30mm is a cheaper and very good alternative.
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