Olympus Zuiko Digital ED 50-200 mm f/2.8-3.5 SWD
7. Coma and astigmatism
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Coma is not a serious problem for the tested lens. Its influence on the round diode image in the frame corner is minimal so, in this category, the ZD 50-200 mm deserves our praise.
Unfortunately the worse problem we’ve got with the astigmatism. The result reaching 13% is nothing to boast of. It is even more surprising that the significant astigmatism level is mostly found in megazooms or low-quality plastic kit lenses.
