It was my understanding (but not sure why I think this is true) that CA can be corrected along the edges of sharp objects, but not fully for the out of focus areas. Is this true? I always thought it was because you could figure out how many pixels worth (in a full size raw image) of CA to subtract out for the focus plane, but items out of focus exasperated the aberrations and there was no way to know just how far out of focus they were to subtract the right amount out from the blurry edges. I ask because I noticed this from the 2nd X100 vs X1 shootout on flickr: The X1 image has some CA (acceptable, but it's there) on the blurry tree in the background (on the leaf edge too, but any good software would take care of that). The X100 image has none on the leaf, which the jpeg engine could be correcting in camera, but neither does the blurry tree in the background. This points to the lens actually having a near perfect lack of CA, right? Is this a logical conclusion or am I missing something related to how lenses and CA works?