Venus Optics LAOWA 15 mm f/2 ZERO-D
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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The photos of starry sky are a similar story. The 2/15 parameters on full frame would be a dream came true for many astrophotographers; unfortunately the crop shown below will damped down the enthusiasm of astrophotography fans very efficiently.
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| A7R II, JPEG, f/2.0, Corner of the frame 1:1 |
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Astigmatism understood as an average difference between vertical and horizontal MTF50 values amounted to 11.2% and we consider its level to be medium. Still it must be mentioned that its influence is big when it comes to the maximum relative aperture as, at that point, it reaches over 19%.
Defocused circles of light look sensibly well for an ultra wide angle lens. In the middle of the circle you can notice traces of onion ring bokeh but that effect is not especially pronounced. The lack of circular shape of the aperture might be a more serious problem – the more you close the lens down, the more angular aperture images you get.
| 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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