Panasonic Lumix S Pro 50 mm f/1.4
7. Coma, astigmatism and bokeh
| 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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In order to present a comprehensive performance in this category we also decided to show crops of photos of the sky taken from the left-hand upper corner of full frame. This time, however, we show shots by f/1.4, f/2.0 and f/2.8. It is clear that even on stopping down the aperture by 2 EV coma is not corrected completely and its effects still remain visible in a form of a slight 'comma'. Our starry sky test proved to be more demanding but, at the same time, it proved that the lens feature just a slight coma level; higher level aberrations, responsible for characteristic 'wings' are kept very well in check.
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| Corner FF, f/1.4 | Corner FF, f/2.0 | Corner FF, f/2.8 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 13.7%. It is a result that we consider to be medium. At the same time it's worth adding that astigmatism makes itself felt only and solely by f/1.4, and f/2.0; up from f/2.8 it disappears practically completely.
The appearance of out-of-focus images produced by the Lumix 50 mm f/1.4 we can consider as nice. Despite using as many as two aspherical elements the onion-ring bokeh isn't bothersome. Of course if you take a closer look you can notice some traces of it. The insides of the circles feature a quite even light spread and the rim that appears on stopping down the aperture is not especially intensive. It is strange, however, that with this size of the lens, mechanical vignetting makes itself felt. It doesn't disappear completely even on stopping down the aperture by 2 EV. By f/2.8 the circle we got in the corner of full frame still is slightly truncated - in a lens of this class it shouldn't have happened.
| 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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Center, f/2.8 | Corner APS-C, f/2.8 | Corner FF, f/2.8 |
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