Venus Optics LAOWA Argus 28 mm f/1.2 FF
7. Coma, astigmatism and bokeh
Stopping down the lens to f/1.4 doesn't help at all and only after applying a relative aperture near f/2.0 you are able to reduce coma in a significant way.
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| 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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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 18%. It's a value that approaches high levels so it contributes significantly to weakening of image quality.
When it comes to out-of-focus areas it would be difficult to have any reservations to the results. Circles of light look nice; even onion-ring bokeh, a feature that might cause problems because of the presence of aspherical elements, is rather unconspicuous. Still there are other problems: in the corners of the frame you can notice that light spread in the circles becomes very uneven and also mechanical vignetting might bother you even by f/2.0.
| Center, f/1.2 | Corner APS-C, f/1.2 | Corner FF, f/1.2 |
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| 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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