Venus Optics LAOWA STF 105 mm f/2 (T3.2)
7. Coma, astigmatism and bokeh
| 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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When it comes to the astigmatism, understood as an average difference between vertical and horizontal MTF50 function values the lens performs as it should. The value measured by us amounted to just 2.3% - it means that aberration shouldn’t bother you at all.
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Providing out-of-focus areas pleasing to the eye was one of the tasks of this lens and without doubts it performs very well. When you look at the circles, there’s just one objection: the influence of mechanical vignetting (a strong truncation of the circle in the frame corner) and the already mentioned random performance of the 9-blade diaphragm on significant stopping down.
| 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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Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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When you employ the second, 14-blade aperture, the problems with roundness disappear. The circles look nice - a slight brightness loss on the edges which is supposed to guarantee pleasant, silky bokeh still remains noticeable.
| Center, f/2.0, T4.0 | Center, f/2.8, T5.6 | Center, f/4.0, T8.0 |
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