This is a 100% crop of a portrait shot... I noticed that in this shoot, the brown shirts look like they were shot at 1600 or 3200 ISO. However, it was indeed ISO 400. Any ideas on why this would be? This is from a RAW file. The other colors in the picture don't show the grain near as much. Yes, I'm zoomed in quite a bit, cause there are 8 people in this picture. so it's not a huge deal, but why?