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[QUOTE=GrahamL;1009674] 14 mm xw because I felt the 14 gave a better view, aside the FC issues you might come across in regard to this eyepiece in a fast scope (12" f5 for me ) I still found it optically a great eyepiece .
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Just an FYI, the field curvature observed in the XW14 is directly related to the focal length of a Newtonian, not the focal ratio.
While the outer field is obviously defocused in a 10" f/5 dob (1250mm focal length), it should be much less obvious in a 16" f/4.5 dob (1800mm focal length).
The shorter focal length mirror produces more curvature (of the same sign) to interact with the curvature built into the eyepiece.
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