Viltrox AF 35 mm f/1.2 LAB review

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Viltrox AF 35 mm f/1.2 LAB

19 February 2026

Maciej Latałło

7. Coma, astigmatism and bokeh

For such a fast instrument, difficult to correct, the Viltrox deals with coma quite well. In the corners of the APS-C/DX sensor you can notice just a very tiny decrease of the size of the diode. In the corner of the full frame you see very small, asymmetrical wings that indicate that high degree aberrations haven't been corrected perfectly well. Still, these aren't significant effects, and they don't provide you any reason to complain.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

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

To make our test more comprehensive, we decided to show crops taken from photos of the night sky taken from the right-hand upper corner of full frame. This time we show images taken by f/1.2, f/1.8, and f/2.5. As you can check on your own, the star test shows a similar performance as in the case of photos of a diode. You can notice these small, asymmetrical wings that disappear on stopping down the aperture.

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Corner FF, f/1.2	Corner FF, f/1.8	Corner FF, f/2.5

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 14.3%, a value on the borderline between medium and high level. In this category the Viltrox definitely cannot be praised. Of course you should notice the fact that the astigmatism is bothersome only by f/1.2 and f/1.4; by f/2.0 it decreases to a low value of 4.3%.

Defocused circles of light, provided by the Viltrox 1.2./35, are quite nice. There are many aspherical elements in its construction, so you can also spot onion-ring bokeh, but it's very slightly accented. The interiors of the circles show a quite even light spread and the outer rim is not especially intense. In this category everything looks sensibly well.

Mechanical vignetting remains a problem, though. At the maximum relative aperture its level is high and it makes itself felt even on stopping down the aperture by 2 EV.

Center, f/1.2	Corner APS-C, f/1.2	Corner FF, f/1.2

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