Last week I upgraded from a crop sensor (the NEX-7) to a full frame camera (the A7r). I’ve taken several shots now and I'm still blown away by the difference. The difference for night time shots is, well, night and day! My first fully processed shot was of the Jefferson memorial. I used my wide angle lens from the NEX-7. You can use this lens on the A7r for 12mm to 16mm without any vignetting. However, I went for 10mm, because I like the effect in this shot.