On 25/11/2014 10:48 a.m., Oregonian Haruspex wrote:
On 2014-11-24 20:57:12 +0000, Alfred Molon said:

I was browsing photozone.de and couldn't find any full-frame rectilinear
12mm lens. The widest was 14mm. Why is that the case?

I own a full frame rectilinear 12mm lens, the first of its kind. The
Voigtlander Heliar 12mm f/5.6 Aspherical. It's a rangefinder (Leica
screw mount) lens which won't work on an SLR though. Looks like
Photozone needs to get with the program - I bought it a decade ago!

Photozone have tested it on Sony NEX (APS-C).
Even on 1/2 frame, performance was average (very high light fall-off
indeed, only average resolution off centre-frame)
So much for the "non retro-focus advantage".