Hello people. I'm interested in know if this lens vignetting or not to 16mm. I have readed some comments with the 'old' NEX (same another very wide lens, specially wit the NEX-7), but I dont know if have improved with the new cameras Axxxx, specially withe with A5100. And in general terms this lens have decent quality? I need a wide lens cheap. May be the Sigma 19mm is a better option although a little less angular. Thanks.