Olympus M.Zuiko Digital ED 12-45 mm f/4.0 PRO
7. Coma, astigmatism and bokeh
| E-M5 II, 12 mm, f/4.0, Center | E-M5 II, 12 mm, f/4.0, Corner |
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| E-M5 II, 25 mm, f/4.0, Center | E-M5 II, 25 mm, f/4.0, Corner |
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| E-M5 II, 45 mm, f/4.0, Center | E-M5 II, 45 mm, f/4.0, Corner |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 3.5% and it is a value considered by us to be very low. It can be mentioned that the aberration had a slight tendency to grow with the increase of the focal length – from 2.0% at 12 mm to 4.8% at 45 mm.
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Out-of-focus areas, provided by the Olympus 12-45 mm, aren't perhaps completely ugly but they can't be called nice either. They differ here and there and that lack of smoothness is caused most likely by the presence of aspherical elements inside the lens. You can also notice a ligher rim. Fortunately the influence of mechanical vignetting disappears already on stopping down the aperture by 1 EV.
| E-M5 II, 45 mm, f/4.0, Center | E-M5 II, 45 mm, f/4.0, Corner |
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| E-M5 II, 45 mm, f/5.6, Center | E-M5 II, 45 mm, f/5.6, Corner |
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| E-M5 II, 45 mm, f/8.0, Center | E-M5 II, 45 mm, f/8.0, Corner |
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