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As a point of view, why do reviewers want to evaluate the outer field of ultrawide eyepieces in a fast scope (defined as f/5 or faster) without coma correction?
Coma will obscure whatever correction is or isn't there.
Fast scopes need to have a coma corrector if the reviewer cares about the star images in the outer field.
Evaluating an eyepiece in a fast scope without a coma corrector is like a podiatrist examining your feet when you have sox on.
Better to evaluate what the eyepiece does when coma is eliminated.
That would better tell you how the eyepiece will perform in a scope that has no coma and tell you more about the inherent correction of the eyepiece in the outer field.
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