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The 22NT4 has 50% more field stop diameter than the 17.3 Delos and therefore 50% more true field. The 31NT5 andf 22NT4 also complement each other very well as there is considerable true field difference there too on the same 'scope.
A Paracorr does clean up the last 5% of the 22NT4 (by flattening 1.15x) when used in a large Newtonian and that combination is very impressive. When use on a flat field refractor the 22NT4 is just about perfect as is.
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