Canon EF 24-70 mm f/2.8L II USM review - Coma, astigmatism and bokeh

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Canon EF 24-70 mm f/2.8L II USM

29 November 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

You can only praise the coma correction. That aberration is completely invisible in the APS-C sensor corner and negligible in full frame corners. In this category the Canon prevails over the Sigma, which had significant coma on full frame and over the Tamron, which coma level was lower than that of the Sigma but still noticeably higher than that of the Canon.

Canon EF 24-70 mm f/2.8L II USM - 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.