Olympus M.Zuiko Digital ED 17 mm f/1.2 PRO review - Coma, astigmatism and bokeh

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Olympus M.Zuiko Digital ED 17 mm f/1.2 PRO

29 January 2019

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Olympus M.Zuiko Digital ED 17 mm f/1.2 PRO corrects coma moderately well. Images of a diode positioned in the very corner of the frame are noticeably distorted but still it would be difficult to call such an effect huge or even big. Additionally, that aberration decreases significantly on stopping down the aperture by 1 EV.

E-M5 II, f/1.2, center	E-M5 II, f/1.2, corner

E-M5 II, f/1.8, center	E-M5 II, f/1.8, corner

We don’t have any serious complaints when it comes to the correction of astigmatism for a change. An average difference between horizontal and vertical MTF50 function values amounted to just 6.7% which is a low value by our standards.

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The appearance of out-of-focus images, produced by the tested lens, can be called sensible. However, it would be difficult to praise them overly due to concentric rings visible in circles of light. They are most probably a result of employing a significant number of aspherical elements. That averagely good assessment is further justified by mechanical vignetting, visible by f/1.2 and f/1.8 apertures.

E-M5 II, f/1.2, center	E-M5 II, f/1.2, corner

E-M5 II, f/1.8, center	E-M5 II, f/1.8, corner

E-M5 II, f/2.5, center	E-M5 II, f/2.5, corner