Ronald Moravec , Feb 04, 2009; 06:44 a.m.
I have seen this come and go depending on the screen magnification which tells me it is something other than moire. I had it on a dark green small fine knit shirt when I was photographed by the company photographer with a a Canon. When I told him about it, he said it was not moire. He is now a Canon education rep so I presume he knows what he is talking about.