Olympus Zuiko Digital 150 mm f/2
7. Coma and astigmatism
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As you can see in the clippings below, showing the image of the diode in the center and the corner of the frame, coma has a minimum influence on worsening the image quality. The level of this aberration correction is satisfactory.
As long as astigmatism is concerned, we have the first reason, maybe not to complain, but also not to slobber in praise. The difference between the vertical and horizontal MTF50 values amounted to 11%, which is noticeable in the lens of this class. On the other hand, though, it’s scary to think how the Olympus’ MTFs would look like, if the astigmatism were smaller. I’m afraid the standard scale of our graph would be insufficient…
