Fujifilm Fujinon XF 18-55 mm f/2.8-4 OIS review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 18-55 mm f/2.8-4 OIS

6 September 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Fujinon 18–55 mm doesn’t correct the coma in a perfect way but it would be unfair to say it is a particularly big problem. The result should be definitely more praised than scolded so the lens in this category we assess in a positive way.

Fujifilm Fujinon XF 18-55 mm f/2.8-4 OIS - Coma, astigmatism and bokeh

When it comes to the astigmatism, our feelings are similar to those concerning the coma. The average difference between horizontal and vertical MTF50 function values amounts to 5.2% which is a good result, very near an ideal one in fact.

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The defocused light circles are beyond any serious reproach. You can notice a lighter rim on the edge and you get a truncated circle in the corner of the frame at the maximum relative aperture but these are minor slip-ups. They indicate significant vignetting which is due to mechanical factors. Fortunately on stopping down to f/5.6 the circles look very similar on the edge of the frame and in the centre.