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CA is what happens in lower end optics. Amounts to some purple / blue fringing at the extreme edge of the picture. Ever heard the terms Achromatic -vs- Apochromatic? CA is present in Achromatic optics.

I have one of these projectors comming, and in the manual it says that if your picture looks bad or has garbage/ect..ect.. at the edge of the images, turn overscan on. I am supposed to have the projector tomorrow, I've been reading up in hopes of a quicker and easier installation. Page 14...

The SP5000 definetly has an overscan feature you can turn it off and on. I am scared to death about how it will handle non anamorphic widescreen myself to tell you the truth and not even a CH setup.