Olympus Zuiko Digital 50 mm f/2.0 Macro ED
7. Coma and astigmatism
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The influence of coma on the diode image in the frame edge is noticeable but not huge. On stopping down the situation improves significantly because the level of that aberration decreases to zero already by f/4.0.
Astigmatism, like chromatic aberration, is entirely alien to the Zuiko lens tested here. The average difference between horizontal and vertical MTF50 function values amounted to just 3% which is considered a very good result.
