Image was for demostration purposes only, I never use that settings, this image was a 100% crop from 1dsmII, now I use the 1dsmIII and usually don't go over 50 in amount.
Anyway thanks for explanations, I understand that acr sharpen is just designed for capture sharpening and it just have to do so, anyway I cannot imagine what kind of input resolution woiuld be need in order to use radius 3, if it doesn't exist such device maybe would be better to not let the slider go so high.
Arnau.