So I just bought a Sony a6500 and the Sony E Mount 10-18mm UWA lens. I read that it would work on a full frame sensor between 12-14mm with no vignette. But to my surprise I put it on my a9 and it appears to work throughout the full focal range with no problem. There has to be a catch here right? Both images taken at 10mm with no cropping done. Second image my face was about just a few inches from the front lens element.