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I use just 4 eyepieces in my 18" F5.58 Dob.
Using the Paracorr II my effective focal length is 2935mm
so:
Nagler31T5 gives 95x @ 4.8mm exit pupil
Ethos 21 gives 140x @ 3.25mm
Ethos 13 gives 226x @ 2.00mm
Ethos 8 gives 367x @ 1.25mm
My maximum True Field is 1º using the N31T5 without the Paracorr, 82x @ 5.6mm exit pupil. These seem to work well.
I recently sold off lots and lots of eyepieces leaving just these four and some bino-pairs which I use with the 5" refractor...
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