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It is not just you, the 30mm does show a little field curvature in my C925 but I have never found it objectionable. Really only the Plossls show none discernible in my scope.
The 30mm is better with the reducer installed but the vignetting may be masking a little of it as well. I actually find that to feel a little like the larger AFOV, you still need to look around to take in the whole field and the vignetting softens the field stop.
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