Fujifilm Fujinon XF 27 mm f/2.8 review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 27 mm f/2.8

19 September 2013

Arkadiusz Olech

7. Coma, astigmatism and bokeh

As the Fujinon’s 2.8/27 resolution performance was weak on the edge of the frame we expected some problems with the correction of different off-axis aberrations like e.g. the coma. In the crops below you can notice that the coma can be indeed bothersome and is pretty distinct at the maximum relative aperture. Still its level is not very high and, as a kind of consolation, we should add that on stopping down to f/4.0 the coma gets significantly lower.

Fujifilm Fujinon XF 27 mm f/2.8 - Coma, astigmatism and bokeh

The astigmatism is corrected in the right way for a change – the average difference between horizontal and vertical MTF50 values amounted to 5% so it can be called low.

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We have no serious reservations concerning the light circles created by defocusing light points. In the frame centre, at the maximum relative aperture the light spread in the circle is even, there are no onion rings or distinct local extremes so the blur should be pleasant to the eye. A significant truncation of the circle in the frame corner is the only thing we have reservations about – its shape indicates that only a small part of optics gathers light in the corner. Still you should remember it is just a “pancake” construction so it would be foolish to demand a perfect vignetting correction here.