Viltrox AF 26 mm f/2.8 EVO review

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Viltrox AF 26 mm f/2.8 EVO

27 October 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

The coma correction of the Viltrox under test is quite interesting and may confirm our earlier suggestion regarding field curvature. Between the center of the frame and the APS-C/DX sensor corner, we can see a significant increase in the size of the LED image. However, as we move further away from the center, the distortion barely increases at all. As a result, the LED in the full-frame corner looks very similar to the one in the corner of the smaller sensor. In this respect, the Viltrox demonstrates a clear advantage over the more expensive Nikkor, whose coma looked rather ugly.

Center, f/2.8	APS-C corner, f/2.8	FF corner, f/2.8

Center, f/4.0	APS-C corner, f/4.0	FF corner, f/4.0

To provide a more complete picture of the lens's performance in this category, we also decided to present crops from photographs of the sky, taken from the upper-right corner of the full-frame sensor. This time, however, we show images captured at f/2.8, f/4.0, and f/5.6. The star test proved somewhat more demanding, and coma was slightly more noticeable in these images.

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FF corner, f/2.8	FF corner, f/4.0	FF corner, f/5.6

Astigmatism, defined as the mean difference between the horizontal and vertical MTF50 values, measured 2.4%. This is a very low value, so the Viltrox deserves praise in this category as well.

The out-of-focus highlights produced by the Viltrox 26 mm f/2.8 look quite good. Its optical design uses as many as two aspherical elements, yet there is no noticeable onion-ring bokeh effect. One minor issue, however, is a brighter rim consisting of as many as three concentric rings.

Another problem is mechanical vignetting, which was to be expected given the dimensions of the lens under test. It is pronounced at the maximum aperture and remains noticeable even when stopping down by 2 EV, although its impact is then moderate.

Center, f/2.8	APS-C corner, f/2.8	FF corner, f/2.8

Center, f/4.0	APS-C corner, f/4.0	FF corner, f/4.0

Center, f/5.6	APS-C corner, f/5.6	FF corner, f/5.6