Canon EF 135 mm f/2L USM review - Coma, astigmatism and bokeh

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Canon EF 135 mm f/2L USM

3 October 2011

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is corrected splendidly. Even at the maximum relative aperture a point-like image of a diode remains dot-shaped; it looks so in the corner of the APS-C sensor and, what’s really worth emphasizing here, in the corner of full frame as well. The tested lens should be highly praised in this category.

Canon EF 135 mm f/2L USM - Coma, astigmatism and bokeh

The correction of astigmatism can be described in similar way. Its level was determined as 1.8% which is a negligible value.

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The photos below show blurry images of a point-like diode. The spread of light is very even; you can also notice slight deviations from a circular cross section. If you want to pick holes you can write that it’s a shame the producer didn’t use nine diaphragm blades.