Fujifilm Fujinon XF 8 mm f/3.5 R WR review - Coma, astigmatism and bokeh

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Fujifilm Fujinon XF 8 mm f/3.5 R WR

11 October 2023

Maciej Latałło

7. Coma, astigmatism and bokeh

The Fujinon XF 8 mm f/3,5 R WR doesn't correct coma in a perfect way because images of a diode in the frame corners are a bit magnified and slightly deformed to the shape of a classic 'coma'. Still these effects aren't especially pronounced and, taking into account a very wide field of view provided by this lens, we think they still remain acceptable.

X-T2, f/3.5, center	X-T2, f/3.5, Corner

X-T2, f/5.0, center	X-T2, f/5.0, Corner

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 10.5% and it is a value on the borderline between low and medium level.

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Defocused circles of light are difficult to assess; a great depth of field, offered by this lens, makes them simply too small. What's more, when it comes to a lens with such parameters it's not easy to get out-of-focus areas on the photos wide enough to draw any meaningful conclusions. Still the circles show a trace of onion-ring bokeh, after all the lens does feature as many as three aspherical elements. It's also interesting that any influence of mechanical vignetting is practically invisible – circles in the frame corners are out of shape because of the mapping but they also lack any perceivable truncations.