Olympus Zuiko Digital ED 14-35 mm f/2.0 SWD
7. Coma and astigmatism
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The coma makes itself felt especially at the shortest focal lengths. It is quite clearly visible in the 14-23 mm range and it decreases significantly at 35 mm. Perhaps it doesn’t reach a huge or high level but it can be described as a bit above medium. In other words, it could have been a bit better.
Astigmatism won’t cause us any problems for a change. The average difference between horizontal and vertical MTF50 values amounted to 4% which is a very low result. When you analyze the astigmatism results for particular focal lengths, the differences will be slight but you can still notice that the level of this aberration in the middle of the focal lengths range is a bit higher than at both ends.
