Panasonic Lumix S 85 mm f/1.8
7. Coma, astigmatism and bokeh
| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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| Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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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 taken by f/1.8, f/2.5, and f/3.5. The test with using the stars is always a tad more demanding but this time it shows a similar result than the result we got in case of a diode.
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| Corner FF, f/1.8 | Corner FF, f/2.5 | Corner FF, f/3.5 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 13.8%. It is a result we consider to be medium and we should mention the fact that astigmatism can be noticed just by f/1.8 and f/2.0. By f/2.8 it becomes practically zero.
Out-of-focus images produced by the Panasonic S 85 mm f/1.8 are very nice. The interior of the circles doesn't feature any local extreme points and a rim that appears on stopping down the aperture is not especially intensive. Mechanical vignetting is a problem for a change. It's level is very high at the maximum relative aperture and also it doesn't disappear completely even on stopping down the aperture by 2 EV.
| Center, f/1.8 | Corner APS-C, f/1.8 | Corner FF, f/1.8 |
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| Center, f/2.5 | Corner APS-C, f/2.5 | Corner FF, f/2.5 |
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Center, f/3.5 | Corner APS-C, f/3.5 | Corner FF, f/3.5 |
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