It is one of those things that you think happens only to other people (or cameras)... until it happens to you. You hear about moiré problems with MFDB and/or Leica M8s and M9s, given that they do not have anti-aliasing filters, and you think you are safe with your "blurry" camera (i.e., the one containing such a filter). Until one day you encounter this (check the black louvres on the blue building) :
[attachment=21219:Screen_s...42.10_PM.png]
Well, maybe I shouldn't, but I am surprised. Any explanation for this (other than "nothing is perfect"), and especially how to get read of it? The out-of-camera file was processed in LR 3 Beta 2.0 with everything on default (and I checked Canon's own DPP, the effect is still there, though slightly less pronounced). Trying to desaturate it (using adjustment brush) doesn't help much as it still leaves darker/lighter diagonal pattern.
On a side note, I never cease to be surprised just how sharp Canon's 17-55/2.8 is