Leica APO-Summicron-SL 35 mm f/2 ASPH.
7. Coma, astigmatism and bokeh
| 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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In order to make the performance in this category comprehensive, we decided to present crops of photos of the sky taken from the right-hand upper corner of full frame. This time these are shots taken by f/2.0, f/2.8, and f/4.0. It is clear that the bar was set a tad higher here because some traces of coma can be visible. Still, it's worth taking into account the fact that we present here 1:1 crops from a high resolution detector so the effect, described here, is really slight.
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| Corner FF, f/2.0 | Corner FF, f/2.8 | Corner FF, f/4.0 |
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Astigmatism, understood as an average difference between vertical and horizontal MTF50 function values, amounted to 10.8%. It is a result on the borderline of low and medium values so we don't get here any reasons to complain but, considering the price of this lens, you could expect a better performance.
Out-of-focus images produced by the tested Leica are sensible. Onion-ring bokeh stemming from the use of as many as five aspherical surfaces is the only flaw we could find. Mechanical vignetting is moderate because it disappears completely on stopping down the aperture by 2 EV.
| 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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Center, f/4.0 | Corner APS-C, f/4.0 | Corner FF, f/4.0 |
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