I have a Nikon D7100. I have my ISO on auto and sensitivity level to 3200. I normally shoot in aperture priority and program modes. With my Nikon D3100 I was able to adjust the ISO to 100 and it would stay there but with the D7100 I turn the back rotating wheel to 100 but on the meter on top it seem to jump to 3200. I am unsure what actually goes on inside the camera as I cannot establish the ISO on the camera reading on top. How do I get it to stay on 100 cause normally I shoot outside in good light but some of my pictures are washed out. I guess I either have the ISO settings wrong in the program or I don't understand the meter on top of the camera. Can someone please help this old gal out. By the way, I was shooting today with my prime 35 and aperture on 4.5. Maybe to much light crept in that's why some pics where washed out. Seems was especially the case in aperture.