[frank]

Yes, we know that 12mm is 12mm in theory. However, we know the companies fudge (i.e. a 300mm lens may be 280 mm). So, did they design the lens as an 12mm lens, with the uncorrected view like an 10 or 11mm field of view, and after processing you get 12mm? Or did they fudge, and the unprocessed is 12mm, while processed is only 14mm? 

 

If one calculates back, one could determine the actual field of view, but did anybody do that?

 

As a matter of fact, what about normal dSLR lenses, say a normal 18-55 kit lens that has barrel distortion that doesn't get automatically corrected. Is the field of view at 18mm the uncorrected or corrected one? Presumably the uncorrected one.

 

Yes, that is what I think too. I don't believe I get a 15mm view at the 16mm of the 16-35mm lens without distortion correction in post processing. Otherwise I will be very happy with the high distortion.