Viltrox AF 55 mm f/1.8 EVO review

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Viltrox AF 55 mm f/1.8 EVO

24 June 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

Crops below show that the Viltrox AF 55 mm f/1.8 EVO deals with coma decently well. In the corners of the APS-C/DX this aberration is practically imperceptible and in the corners of full frame you can notice mainly a slight increase of the image of a diode with very slight 'wings'. In this category the Viltrox performs better than more expensive models produced by Nikon and Sony; at the same time the tested lens is defeated by the Panasonic and the Sigma C 2/50.

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5

To make our test more interesting and comprehensive, we decided to show photos of night sky taken from the right-hand upper corner of a full frame by f/1.8, f/2.5, and f/3.5. The test performed with stars is usually a tad more demanding that the diode test but in this case it seems the Viltrox deals a tad better or we got such an impression.

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Corner FF, f/1.8	Corner FF, f/2.5	Corner FF, f/3.5

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to exactly 6%, a value we consider to be on the borderline between very low and low level. Here the tested Viltrox fares similarly as the Sonnar and the Nikkor, a tad better than the Panasonic, and a bit weaker than the Sigma.

Defocused circles of light provided by the Viltrox 1.8/55 EVO look relatively nice. As its optical construction features one aspherical element you can notice some onion-ring bokeh but this effect is not especially intensive. The interiors of the circles show a quite even light spread and the outer rim is moderately intensive. By the way, if you want to see the progress of Viltrox in this area it's worth taking a look at our test of the old Viltrox AF 50 mm f/1.8 FE/Z.

Mechanical vignetting makes itself felt by f/1.8 and f/2.5 but on stopping down the aperture by 2 EV it disappears completely.

Center, f/1.8	Corner APS-C, f/1.8	Corner FF, f/1.8

Center, f/2.5	Corner APS-C, f/2.5	Corner FF, f/2.5

Center, f/3.5	Corner APS-C, f/3.5	Corner FF, f/3.5