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IIRC, I think I read somewhere the 30mm ES 82° has a 43mm dia field stop? If true, the tfov would be very slightly larger than that of the 31 Nagler and at the current price, an absolute steal. There's no way I could spring for the Nagler after breaking the bank for the Ethos but the ES is very tempting I must say

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I have 40.6mm for the field stop on the ES, 42mm on the Nagler.
Weight-wise, the difference is:
ES 30--1000g
Nagler 31--1000g
Eye relief is:
ES 30--21mm
Nagler 31--19mm

As to whether you need a 31 Nagler if you have a 21 Ethos, remember the field stop of the Nagler is 42/36.2 or 16% wider and has a magnification factor 21/31 or 32.3% lower.
For the largest star clusters and nebulae, the lower magnification, increase in exit pupil, and wider field, makes it worth it.
In my 12.5", the appearance of the Veil with an O-III filter on the 31 Nagler is just short of "the singing of angels".

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