Panasonic Leica DG Vario-Elmarit 8-18 mm f/2.8-4 ASPH.
7. Coma, astigmatism and bokeh
| E-M5 II, 8 mm, f/2.8, center | E-M5 II, 8 mm, f/2.8, corner |
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| E-M5 II, 13 mm, f/3.5, center | E-M5 II, 13 mm, f/3.5, corner |
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| E-M5 II, 18 mm, f/4.0, center | E-M5 II, 18 mm, f/4.0, corner |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 10% so can be called medium. Still the maximum focal length is the biggest contributor to that value as the astigmatism level at that point reaches 14%.
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Taking into account the fact that you deal here with an ultra wide-angle zoon lens we cannot criticize the blurry areas too harshly. Only features that stick out in a negative way are a lighter rim and deformations of the circle due to the lens’s mapping. After all out-of-focus areas are not a feature you expect from a lens with such angles of view, additionally offered for a small Micro 4/3 camera format.
| E-M5 II, 18 mm, f/4.0, center | E-M5 II, 18 mm, f/4.0, corner |
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| E-M5 II, 18 mm, f/5.6, center | E-M5 II, 18 mm, f/5.6, corner |
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| E-M5 II, 18 mm, f/8.0, center | E-M5 II, 18 mm, f/8.0, corner |
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