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Ok. A 2” focuser to accomodate a full frame camera doesn’t mean you have to stay with 2” eyepieces. Your focuser would have come with a 2”-1.25” adapter, if not your Powermate would have. 1.25” is all you need for high power work.
The lowest power and therefore widest true field though is only achievable with an eyepiece with the largest field stop diameter and of course 2” is going to allow for a larger diameter than 1.25”
Yes the 82 degree Nagler 31mm is a good choice provided your sky background is not too bright. If you use a Paracorr it will give 1.13deg field with 6mm exit pupil which is very nice. Even without a Paracorr will be a good match in a darker surround. Note the reason the 26mm Nagler was invented was because of the ever growing number of f4.5 telescopes in use but it was eventually discontinued when the 21mm Ethos came out. The 31mm has better eye relief than the 26mm and is quite comfortable to use. I’ve not tried the 21 Ethos.
I think you will like the 31mm Nagler if you can get one used. Note there are a few 30mm/80deg lower cost with lesser number of element ‘clones’, some claiming Nagler like performance. These simply do not work well at f4.5 but are OK in f10 or greater although even at f10 I still prefer my 31 Nagler over the 30/80 ‘clone’ that I also have and purchased first thinking it would work well in my f6.4 Newtonian only to find myself eventually getting the Nagler.
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