Panasonic Leica DG Macro-Elmarit 45 mm f/2.8 ASPH. M.O.I.S.
7. Coma and astigmatism
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In the crops below you can see that coma is one of the reasons of the worse image quality on the very edge of the frame. The diode put in the frame corner is distinctly deformed. What’s more the situation doesn’t change significantly even on stopping down by 1 EV.
Astigmatism is less bothersome as its level, understood as the difference between horizontal and vertical MTF50 function values, we determined as less than 6%.
