Fujifilm Fujinon XF 23 mm f/1.4 R LM WR review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 23 mm f/1.4 R LM WR

5 May 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

The previous version of the Fujinon 1.4/23 didn't exactly distinguish itself when it came to coma correction. Here the situation is much better. Slight deformations of point-like images of a diode can be noticed only at the maximum relative aperture and even there it is not a huge effect. In this category the tested lens simply outclasses the cheaper Viltrox.

X-T2, f/1.4, center	X-T2, f/1.4, Corner

X-T2, f/2.0, center	X-T2, f/2.0, Corner

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 17.7%. It's an average value, even approaching high levels. The influence of this aberration is perfectly visible when you look at diode images, shown above. At the maximum relative aperture, where astigmatism doesn't allow to focus the diode to a point, it occupies several pixels so interpolation algorithms can determine its colour well enough. On stopping down to f/2.0 astigmatism decreases significantly, image beomes sharper, and the diode manages to fit one pixel only – as a result algorithms lose information about its colour.

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Defocused circles of light look really well – especially if you take into account the fact that you deal here with a wide angle lens. Look at them more closely and you'll find a very delicate trace of onion-ring bokeh, most likely a result of using aspherical elements. You can have more reservations when it comes to mechanical vignetting – it doesn't disappear completely even on stopping down the aperture by 2 EV.