01-28-2014, 09:53 AM
Quote:I already wrote "(or angle of view, more precisely)".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.
Then, if the labeled 12mm FL for the wide end of the 12-40mm lens is the true FL at the wide end, then after the distortion correction the diagonal view angle of the image would be that of FL like 13mm?
Quote:The native distortion at 12mm is very large, about 8% according to the test. On the other hand, it seems that the labeled FL at the two ends of a zoom lens is often not quite accurate.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.
My Nikor 16-35mm also has a high distortion at 16mm, about 5% I guess. Each time after I correct the distortion afterwards I clearly see the change in angle of view which I don't like. So I only correct the distortion when it is necessary.