I too use UO Abbe's for high power viewing. But I have driven scope so the rather narrow fov isn't an issue for me. They're low cost enough on the used market, try one. I just read a most interesting posting on the eyepiece forum, "UO Abbe" thread regarding someone who does threshold viewing with 22 & 30" scopes, he got rid of his ethos and kept his Abbe's. I too love doing threshold viewing to the limits of my modest equipment and after trying several brands of 5 & 6mm ep's settled on the UO Abbe's as the best (I did not try mono's or other higher priced ep's).

Jim