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Could it be that this eyepiece was designed and optimized for use with refractors since that is what William Optics focuses on (no pun intended)? I don't own this eyepiece but I have used it in my WO ZS80 and I found it to be a very excellent eyepiece and I didn't notice any curvature. I may have to borrow it again and try it in my NS11 and see what happens.
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