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Any decentering I've seen has a few specific traits:
1. The center is typically sharp or sharp-ish.
2. One side is in focus at a different distance than the other side (this is the "duh" point).
3. One side is often sharper than the other is capable of being, no matter the focal point.
4. The less sharp side often exhibits a kind of "jittery" appearance, almost as if the lens was shaken in a linear way, which doesn't affect (or doesn't affect as much) the other side of the image. It may also just appear to be an unusually fast, gradual loss of resolution leading away from the center and worse in one direction than the other. The center is often least affected by any deficits.
5. The image-quality-reducing traits are reduced, but never eliminated, by stopping down.
6. If it's really bad, you can actually see the decentering effects through the viewfinder.
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