This seems more like ailiasing than CA. (On the other hand it may be something introduced be the microlenses.)
Aliasing can occur on very high res cameras with very high res lenses on occasions in fine detail deep within an image. Usually in very fine detail when the lens is about 2 stops down from max aperture and at its peak performance. In this case either open up or close down a stop or so, use a lower resolution, use the anti aliasing control in your software( not sure about Canon but the Kodak Photodesk works well), or use an anti aliasing (blurring) filter from Caprock or Tiffen. These come in 4 strengths but beware as all will lower the resolution and you will need to then sharpen more. That is why the Kodak SLRs do not have either microlenses or an aa filter built in. =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
