Canon EF 14 mm f/2.8L USM II
7. Coma, astigmatism and bokeh
As we already mentioned the astigmatism is also a problem. In that case it is difficult to divide off its influence from the lateral chromatic aberration unambiguously but it is certainly significant. The average difference between horizontal and vertical MTF50 values is 17% here which is a high result. It’s a pity that such an expensive lens must have such problems.
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Photos posted below show off-focus images of a diode positioned in different frame areas; they were taken for different aperture values.
