I purchased a Sigma 15mm lens a few years ago, and recently upgraded from a D300 to a D600. Remembering that lens was on the shelf, I decided to try it out on the D600. I forgot that my feet are a size 10, and most of the photos included most or all of my toes, as well as some fingers and knees. On an FX camera, it's 180 degrees FOV. LOL.