Olympus M.Zuiko Digital 40-150 mm f/2.8 ED PRO review - Coma, astigmatism and bokeh

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Olympus M.Zuiko Digital 40-150 mm f/2.8 ED PRO

27 July 2016

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma is perhaps not a very serious problem of the Olympus PRO 40-150 mm but still at every focal length the image of the diode in the frame corner is deformed a bit. That effect is a tad more pronounced in the 40-90 mm range and a bit less bothersome for the 150 and 210 mm focal lengths.

E-M10, 40 mm, f/2.8, center	E-M10, 40 mm, f/2.8, corner

E-M10, 90 mm, f/2.8, center	E-M10, 90 mm, f/2.8, corner

E-M10, 150 mm, f/2.8, center	E-M10, 150 mm, f/2.8, corner

E-M10, 210 mm (TC), f/4.0, center	E-M10, 210 mm (TC), f/4.0, corner

The astigmatism, understood as an average difference between vertical and horizontal MTF50 function values amounted to 7.3% so you can call it moderate. After attaching the converter the situation gets worse with the astigmatism level increasing to 12% so getting near medium levels; as such it becomes one of important factors which adversely affect the image quality.

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The appearance of circles created by defocusing light points is not impressive. You get a light rim which intensity increases with the increase of the aperture; you also get plenty of concentric onion rings. A low level of mechanical vignetting is some consolation here – already at f/4.0 the circle in the frame corner is perfectly round.

E-M10, 90 mm, f/2.8, center	E-M10, 90 mm, f/2.8, corner

E-M10, 90 mm, f/4.0, center	E-M10, 90 mm, f/4.0, corner

E-M10, 90 mm, f/5.6, center	E-M10, 90 mm, f/5.6, corner