Fujifilm Fujinon XF 23 mm f/2.8 R WR review

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Fujifilm Fujinon XF 23 mm f/2.8 R WR

19 December 2025

Maciej Latałło

7. Coma, astigmatism and bokeh

Simple, small optical constructions usually experience a lot of problems related to coma and other aberrations responsible for deformations of point-like light images. The Fujinon 2.8/23 doesn't deal with this problem in a perfect way but, at the same time, it shouldn't be criticized too harshly. The appearance of a diode put in the frame corner features a slight enlargement of the size and a seed of 'wings'. Fortunately, it's not a pronounced effect.

X-T30, f/2.8, Centre	X-T30, f/2.8, Corner

X-T30, f/4.0, Centre	X-T30, f/4.0, Corner

In order to present a comprehensive image in this category we decided to add crops taken from photos of sky taken from the upper right-hand corner of the detector. This time we show photos taken by f/2.8, f/4.0 and f/5.6. This test confirms our earlier conclusions and shows the aforementioned 'wings' and how quickly they decrease with the stopping down.

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Corner, f/2.8	Corner, f/4.0	Corner, f/5.6

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.1%. It's a value positioned by us on the borderline between very low and low level so such that doesn't provide any reasons to complain.

Out-of-focus circles of light look very sensibly indeed. You can't find inside them any distinct local extreme points and even onion-ring bokeh, a result of adding two aspherical elements, is practically invisible. A brighter rim makes itself felt a bit, as its intensity increases with stopping down. Mechanical vignetting is also visible and it doesn't disappear even on stopping down the aperture by 2 EV but, with such a type of the lens, you should expect nothing less.