Just to explain if everyone isnt up to speed - like I wasnt - Voigtlander have just issued a new (version iii) of this super wide angle lens. The version ii which I tried about a year ago wasnt really usable on an A7 camera - it suffered from color shift, corner smearing and vignetting - and a lot of each. Supposedly the new version has been specifically designed for digital FF cameras such as the A7 and these problems have now gone. The few shots I have seen from this lens on the internet look pretty good although I cant really tell if they have been fixed. Would really like to see a few shots with some commentary if anyone has one.