I have had an occasional problem with moire creeping up. Mostly, my subject of interest is avian, and a few of the birds out there have very fine feathers which can create some annoying moire patterns. Case in point is my Blue & Gold. You can see the problem along his head. Another particular bird I'm having a problem with is the Mallard. Their feathers are so fine, so as to shed water, that they create horrible moire. I recently shot some at the local duck pond that were beautiful pictures, but the moire was SO bad that it almost hurt your eyes just viewing the pictures. I wound up deleting them, though I wish I hadn't just to show here. I have some very good shots of other ducks, coots, grebes, and loons, which all have dense feathers for shedding water, but no moire in the photos.... that dang mallard is frustrating. I did a search, but really only found explanations of what moire is, which I already know. Any suggestions on how to reduce or eliminate it?