Canon EF 28-135 mm f/3.5-5.6 IS USM
7. Coma and astigmatism
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The level of coma for this lens could be described as medium throughout the whole focal length range. Taking into consideration the destination of the lens, we expected better results.
The correction of another very important off-axis defect – astigmatism – is perfect! For our tested lens the average difference between horizontal and vertical MTF50 values, measured in the center of the frame, was 3%. This result is very good.
