Venus Optics LAOWA 9 mm f/2.8 ZERO-D
7. Coma, astigmatism and bokeh
X-T2, f/2.8, center | X-T2, f/2.8, corner |
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X-T2, f/4.0, center | X-T2, f/4.0, corner |
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Similar images we obtained while photographing a diode in our studio and also taking shots of starry sky. Even though you can notice a certain influence of that aberration coma is not especially bothersome and the images of stars are not strongly deformed.
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Fujifim X-E1, JPEG, f/2.8, corner of the frame 1:1 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 values, reached 6%. It’s a result considered by us as low. It’s worth noticing that aberration’s level is bothersome mainly by f/2.8; from f/4.0 onwards it becomes practically negligible.
With such parameters as those of the Laowa 2.8/9 it would be difficult to get wide out-of-focus areas in your photos. I suppose, prospective buyers of this lens don’t consider nice, smooth blur as an important feature. It’s for the best – circles of light we got didn’t look nice. You can notice a lot of brightness gradients and deformations; apart from that the shape of the 7-blade aperture is hardly circular.
X-T2, f/2.8, center | X-T2, f/2.8, corner |
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X-T2, f/4.0, center | X-T2, f/4.0, corner |
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X-T2, f/5.6, center | X-T2, f/5.6, corner |
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