CollinB wrote: Just take a photo of a flat surface (the classic brick wall test, for example) perpendicular to the camera/lens. Focus in the center with the lens wide open. Look at the resulting image and check that the left and right edges are *equally* sharp; do the same for the top vs. bottom.
And try several focusing distances, because many of those lenses perform fine at certain distances and disalign badly at others. Typical failures happen at intermediate focusing distances (e.g. around 1-to-3 meters, or 3-to-9 feet), while usually even poor lenses perform well at closest distance and infinity.
Dario
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