Canon EF 200 mm f/2.8L II USM review - Coma, astigmatism and bokeh

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Canon EF 200 mm f/2.8L II USM

4 January 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

Looking at the crops below you can tell at once the coma is corrected in an exemplary way. It doesn’t make itself felt either in the corner of the APS-C sensor or in the corner of full frame. Here the tested lens deserves our biggest praise.

Canon EF 200 mm f/2.8L II USM - Coma, astigmatism and bokeh

The astigmatism can be noticed at the maximum relative aperture but this aberration decreases very quickly on stopping down. Its average value was 7.6% so there is no need to complain here.

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The quality of back focus images can be assessed by analyzing photos of light points situating outside the focal plane. In the case of the Canon 2.8/200 it would be difficult to have any reservations. The images show a quite even distribution of light across the whole circle. What’s more, already by f/4.0 the circles look practically the same as in the frame centre, in the corner of the APS-C sensor and in the corner of full frame. Here the lens deserves to be praised too.