Canon EF 300 mm f/2.8 L IS II USM
7. Coma, astigmatism and bokeh

The astigmatism is perhaps corrected in not such a perfect way as the coma but also here it would be difficult to have any reservations. The average difference between vertical and horizontal MFT50 function values amounted to 5.2% which is a result on the borderline between a very good and good level.
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The crops below show a defocused image of a diode taken at different apertures in the frame centre, in the corner of the APS-C sensor and in the corner of full frame. You can notice the light is spread homogeneously- there are no pronounced interferences or lighter and darker rings. You can assume that the fuzziness will be nice, pleasing to the eye.
