Fujifilm Fujinon XF 18 mm f/2 R review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 18 mm f/2 R

14 September 2012

Arkadiusz Olech

7. Coma, astigmatism and bokeh

At the maximum relative aperture the coma is very high. The fact that, after stopping down, that aberration becomes slight is consoling though.

Fujifilm Fujinon XF 18 mm f/2 R - Coma, astigmatism and bokeh

The lens should be praised for a change for the astigmatism correction. An average difference between horizontal and vertical MTF50 function values amounted to just 1.8% which is an excellent result.

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We have also almost no reservations to the appearance of the circles of light in defocused diode images. Both on the maximum relative aperture and after stopping down the light spreads quite evenly there, without showing any distinct rings. What’s more (and it is rare in “pancake” lenses), already after stopping down of the lens by 2 EV the image of the diode in the frame corner is very similar to that, reached in the centre.