So I haven't changed my front line eyepieces for almost a decade now... I love them, consisting of nothing but a 7/9mm Nagler, several type 4's and the 31T5.

I love the 12mm and 17mm type 4's... but can I justify financing the cost of a 13mm Ethos by selling them both, and not miss them?

Is the 13 Ethos versitle enough to replace both of these eyepieces?

Is there any loss of transmission/contrast to gain that 100 degree field?