Venus Optics LAOWA 100 mm f/2.8 2X Ultra Macro APO
7. Coma, astigmatism and bokeh
| 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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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, should be called slight as it amounted to 4.9%. It's worth adding that the f/2.8 aperture contributed the most to that result because from f/4.0 onwards that aberration remains practically imperceptible.
When it comes to the apperance of out-of-focus images it would be difficult to complain. The circles feature an even light spread, without any local extreme points. Even the rim on the edge of the frame, which intensity increases with the stopping down of the lens, is not especially bothersome. Still you can notice an influence of mechanical vignetting- it remains visible even by f/5.6.
| 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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Center, f/5.6 | Corner APS-C, f/5.6 | Corner FF, f/5.6 |
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