So, as of recently I have SEL16 + VCL-ECU1 wide-angle converter and it's working fine for me. SEL16 is smaller than any other lens I have, but 16mm is a bit too wide for general purpose / walkaround lens. Apparently SEL20 can also use Sony UWA and Fisheye converters. So, the question is.. will SEL20 + fisheye (12mm equivalent) be the same as SEL16+UWA (12mm equivalent) ? Or will SEL20+fisheye still have more distortion ? I was trying to find some examples on Flickr but wasn't too successful. If they are the same at 12mm, then it may make sense for me to get SEL20 as it's a better walkaround FL. Although I can make 16mm work too.