Irix 30 mm f/1.4
7. Coma, astigmatism and bokeh
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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When it comes to astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, we don't have any reservations. Its value, measured by us, amounted to 3.7% and it means in real life you don't have to think about this aberration at all.
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Defocused circles of light look very well – their light spread is even, without any brighter rim. Still, if you take a closer look you can notice some traces of onion-ring bokeh, stemming most likely from the fact that the construction features one aspherical element. Despite significant dimensions of the lens mechanical vignetting makes itself felt, you can notice it even on stopping down the aperture by 2 EV. I think it is not a good prognosis for the results, presented in the next chapter.
| Center, f/1.4 | Corner APS-C, f/1.4 | Corner FF, f/1.4 |
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| Center, f/2.0 | Corner APS-C, f/2.0 | Corner FF, f/2.0 |
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Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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