Olympus M.Zuiko Digital 75 mm f/1.8 ED review - Coma, astigmatism and bokeh

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Olympus M.Zuiko Digital 75 mm f/1.8 ED

5 October 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The coma in the tested lens is slight – you can see it only at the maximum relative aperture and even there it will be hardy bothersome. That aberration practically disappears on slight stopping down.

Olympus M.Zuiko Digital 75 mm f/1.8 ED - Coma, astigmatism and bokeh

A bit more problems we have with the astigmatism. You can say it is the aberration which prevents the tested lens from achieving even better results at the maximum relative aperture. Still there are no major problems here. An average difference between vertical and horizontal MTF 50 values amounted to 9% which is on the borderline between low and medium values.

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Let’s check how the images of defocused points of light look. Apart from a noticeable rim at the very edge of the circle you can’t notice any local extremes and the light spreads evenly. Defocused images, provided by this lens, and bokeh, generated by it, should be pleasing to the eye.