Canon EF 28 mm f/2.8 IS USM review - Coma, astigmatism and bokeh

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Canon EF 28 mm f/2.8 IS USM

25 October 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

On the APS-C sensor the coma won’t be problematic; still when the problems appear, and they do so in the corners of full frame, they are rather bothersome. The coma level is huge and remains visible even after stopping down to the value of f/4.0.

Canon EF 28 mm f/2.8 IS USM - Coma, astigmatism and bokeh

We have no reservations whatsoever when it comes to the astigmatism correction degree. The average difference between horizontal and vertical MTF50 value amounted to only 2.6% and it is an excellent result.

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The images of defocused light points are very nice at the maximum relative aperture which might suggest that the blurred areas on photos will be equally pleasant. A ring near the edge of the circle appears on stopping down but, fortunately, its intensity is not high. Apart from that, after stopping down the aperture, the depth of field becomes so large that distinct blur areas, where you could admire nice bokeh, are difficult to find.