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A superwide eyepiece would have to have a flat field, what's the point of a huge canvas if only the centre is in focus? Not only would you have to roll your eyes around to see the far edges, you'd also have to refocus.
One thing that apparently only eyepiece makers with a field-scope lineage (such as Pentax and Nikon) have under control is geometric distortion. I suppose that's because the typical barrel distortion of most eyepieces is particularly annoying with terrestrial use. Oh, and orthos of course, they seem to be distortion free as well.
Cheers
Steffen.
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