Canon EF 24-70 mm f/2.8L II USM
7. Coma, astigmatism and bokeh
It would be difficult to have any reservations concerning the astigmatism correction as well. An average difference between vertical and horizontal MTF50 function values amounts to 5.7% which is a good result. We haven’t noticed any significant differences between particular focal lengths either.
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Finally let’s glance at defocused images of points of light, positioned in different places across the frame. Almost every such a circle features a whole series of lighter and darker rings – it means the light spread is not perfectly even. The rims of the circles are relatively smooth, without any noticeably lighter borders.
