I'm wondering if this is just my copy of the D7100 or if it happens to others. When I shoot a bracketed series for HDR each image in the series is slightly different. The first image is composed lower than the second and the second slightly lower than the third. It doesn't make a great deal of difference in the final hdr image since they are aligned in the software but from time to time I end up with an element I want in the image to be cropped out or to close to the edge. I don't see this behavior with my D800 or my older D7000.