Canon EF 16-35 mm f/4L IS USM review - Coma, astigmatism and bokeh

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Canon EF 16-35 mm f/4L IS USM

22 July 2014

Arkadiusz Olech

7. Coma, astigmatism and bokeh

When it comes to the coma, the performance of the tested lens is faultless. In the corner of the APS-C sensor that aberration remains completely invisible and in the corners of full frame the image of the diode is deformed just slightly. Once again such a result is better than that of the Nikkor AF-S 16-35 mm f/4G ED VR which, in the full frame corners, had some issues concerning that off-axis aberration.

Canon EF 16-35 mm f/4L IS USM - Coma, astigmatism and bokeh

The astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 2.9%. It is a low value so the tested lens corrects that aberration in a proper way.

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Defocused light circles look decently well. Perhaps their light spread is not perfectly even but, on the other hand, there are no high local extremes either.