OM System M.Zuiko Digital ED 90 mm f/3.5 Macro IS PRO
7. Coma, astigmatism and bokeh
| E-M5 II, 90 mm, f/3.5, center | E-M5 II, 90 mm, f/3.5, Corner |
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| E-M5 II, 90 mm, f/5.0, center | E-M5 II, 90 mm, f/5.0, Corner |
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| E-M5 II, 180 mm (TC), f/7.1, center | E-M5 II, 180 mm (TC), f/7.1, Corner |
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We also don't have any reservations concerning astigmatism. An average difference between horizontal and vertical MTF50 function values amounted to 4.2% and we think it belongs to a borderline between very low and low level. What's important, this aberration doesn't increase in a significant way after attaching the teleconverter to the lens.
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The appearance of out-of-focus images provided by the tested lens is pleasing to the eye. You can only have some reservations concerning a brighter rim that appears already at the maximum relative aperture.
On the one hand small Micro 4/3 sensor makes it easier to fight mechanical vignetting, on the other hand we didn't like the relatively long and narrow barrel of this lens. Indeed it proved to be a problem because mechanical vignetting by f/3.5 is distinct and it remains quite visible on stopping down the aperture to f/5.0
| E-M5 II, f/3.5, center | E-M5 II, f/3.5, Corner |
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| E-M5 II, f/5.0, center | E-M5 II, f/5.0, Corner |
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| E-M5 II, f/7.1, center | E-M5 II, f/7.1, Corner |
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