Olympus M.Zuiko Digital 17 mm f/2.8
7. Coma and astigmatism
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Coma also has its measurable contribution to worsening image quality at the edge of the frame. It’s particularly visible at f/2.8, where it noticeably distorts diode image. Fortunately, it vanishes almost entirely after stopping down the lens by 1 EV.
Astigmatism will bother us much less than coma. Its level was measured to be 5% which is considered a small value.
