[Guest]

No, it will be 12mm. Like I said, uncorrected lenses or under corrected lenses give a wider view for the same focal length. So what you end up with a similar view as any other well corrected 12mm lens, after correction of the barrel distortion.

Same story. The 16-35mm you have is not well corrected at 16mm, and gives a wider view than a better corrected lens at 16mm. When you correct the barrel distortion, you end up with a similar width as with the well corrected lens.

 

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.