You're 100% correct actually Dunk - it will still need something because that field curvature is quite apparent.
I got in contact with StellarVue and the 0.8x for the SV70T works for the ED as well. However, I'm taking a punt on the Orion 0.8x working as well (grabbing the one that was advertised here recently). If it doesn't, well I'll sell that off and get the more expensive version.
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