Canon EF 35 mm f/2 IS USM review - Coma, astigmatism and bokeh

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Canon EF 35 mm f/2 IS USM

20 February 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

On the smaller APS-C sensor there are simply no problems with the coma whatsoever but, what is interesting, their number increase quickly when you pass to the corner of full frame. The coma is high there and it deforms the image of a diode in a significant way. The result is visible even on stopping down by 1 EV. It is something you can hardly be proud of because some 1.4/35 lenses (so noticeably faster devices) could tackle this aberration far better.

Canon EF 35 mm f/2 IS USM - Coma, astigmatism and bokeh

The astigmatism correction can be praised, though. The average difference between horizontal and vertical MTF50 function values amounted to just 3% and it is a very good result.

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When it comes to the appearance of defocused circles of light we don’t have any serious reservations here. Near the maximum relative aperture the light spread is even, with the exception to the frame corner of a full frame detector where the border is noticeably lighter than the centre. From f/4.0 aperture you can notice the perimeter of the circle becomes more and more intensive.