Olympus M.Zuiko Digital 7-14 mm f/2.8 ED PRO review - Coma, astigmatism and bokeh

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Olympus M.Zuiko Digital 7-14 mm f/2.8 ED PRO

9 February 2016

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Olympus M.Zuiko Digital 7–14 mm f/2.8 ED PRO doesn’t correct the coma in a perfect way and the crops below are the proof, with the aberration being noticeable at practically every focal length. Still its level is hardly high and on stopping down you can see some quick improvement; our sample shots chapter shows examples of that tendency.

E-M10, 7 mm, f/2.8, center	E-M10, 7 mm, f/2.8, corner

E-M10, 10 mm, f/2.8, center	E-M10, 10 mm, f/2.8, corner

E-M10, 14 mm, f/2.8, center	E-M10, 14 mm, f/2.8, corner

Also the astigmatism contributes to the worsening of the image quality on the frame edge. In the case of the Olympus 7-14 mm it reaches 10.4%. It is also worth mentioning that the middle of the focal range is actually responsible for most of it and the maximum focal length fares the best here.

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When it comes to the appearance of out-of-focus circles of light you find out it is far from perfect either. There is a lighter rim and traces of onion rings inside the circle. Still such results cannot be called very bad – after all blurred area are not a priority in a lens of this type.

E-M10, 14 mm, f/2.8, center	E-M10, 14 mm, f/2.8, corner

E-M10, 14 mm, f/4.0, center	E-M10, 14 mm, f/4.0, corner

E-M10, 14 mm, f/5.6, center	E-M10, 14 mm, f/5.6, corner