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Lens review

Olympus M.Zuiko Digital 45 mm f/1.8

7 September 2011
Szymon Starczewski

7. Coma, astigmatism and bokeh

Coma makes itself felt only at the maximum relative aperture and even there it is not very high. This aberration disappears completely on stopping down to f/2.5.

Olympus M.Zuiko Digital 45 mm f/1.8 - Coma, astigmatism and bokeh

Also the astigmatism doesn’t create any problems. An average difference between vertical and horizontal MTF50 function values amounted to 5% which is a value so low that can be considered negligible.

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Out-of-focus images of a diode, taken at different aperture values in the centre and in the corner of the frame are presented below.

Olympus M.Zuiko Digital 45 mm f/1.8 - Coma, astigmatism and bokeh