Tokina ATX-M 33 mm f/1.4 X review - Coma, astigmatism and bokeh

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Tokina ATX-M 33 mm f/1.4 X

8 August 2022

Maciej Latałło

7. Coma, astigmatism and bokeh

High coma was a serious drag for fast double Gauss standard lenses. We hoped that the Tokina, an instrument much more complex optically, would deal with that problem better. We were wrong. Coma is very distinct and makes itself felt even on stopping down the aperture by 1 EV.

X-T2, f/1.4, center	X-T2, f/1.4, Corner

X-T2, f/2.0, center	X-T2, f/2.0, Corner

Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 5.5%. It's a value on the borderline between very low and low levels so in this cathegory the lens fares well again. It's worth mentioning the fact that this result is influenced the most by the maximum relative aperture; by f/2.0 and f/2.8 astigmatism amounts to practically zero.

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Defocused circles of light look very well indeed. Light layout inside them is very even, without any local extreme points. You should also praise the way the lens reduces mechanical vignetting to a minimum already on stopping down the aperture by 1 EV.