02-08-2015, 06:15 PM
In the f/11 sample with the pointy looking building the railing is out of focus, not soft, in the lower right corner because of the backwards curving field.
In Dave's f/5.6 sample at 11mm you can see strong astigmatism at the left and right edges of the frame. Looks like the meridional plane is weaker than the sagittal plane which is very good itself. These samples are reduced in size from the native 50mp so it will look worse at full res. Whether this has to do with the centering quality of the used sample or not I do not know, but such a short focal length will be extremely sensitive to centering.
In Dave's f/5.6 sample at 11mm you can see strong astigmatism at the left and right edges of the frame. Looks like the meridional plane is weaker than the sagittal plane which is very good itself. These samples are reduced in size from the native 50mp so it will look worse at full res. Whether this has to do with the centering quality of the used sample or not I do not know, but such a short focal length will be extremely sensitive to centering.