Fujifilm Fujinon XF 16 mm f/2.8 R WR review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 16 mm f/2.8 R WR

23 July 2019

Arkadiusz Olech

7. Coma, astigmatism and bokeh

The Fujinon XF 16 mm f/2.8 R WR corrects the coma very well... but only from the f/40 aperture onward. At the maximum relative aperture that aberration remains visible, contributing significantly to the worsening of image quality.

X-T2, f/2.8, Center	X-T2, f/2.8, Corner

X-T2, f/4.0, Center	X-T2, f/4.0, Corner

Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, is quite distinct. In the case of our test it amounted to 10.3% which means the aberration reaches a medium level.

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Defocused circles of light were not especially impressive but it was only to be expected, taking into account the parameters of the tested lens. Two aspherical elements in the lens's construction add to that as well, being most probably the source of visible onion ring bokeh. Additionally, you have to mention the truncation of the circles stemming from mechanical vignetting and their deformations in the corners caused by the wide angle of view and the lens's projection.