Viltrox AF 56 mm f/1.7 Air
7. Coma, astigmatism and bokeh
| X-T30, f/1.7, centre | X-T30, f/1.7, Corner |
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| X-T30, f/2.5, centre | X-T30, f/2.5, Corner |
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In order to present a comprehensive image in this category we decided to add crops taken from photos of sky taken from the upper right-hand corner of full frame. This time we show photos taken by f/1.7, f/2.5, and f/3.6. This test confirms our earlier conclusions and proves that the Viltrox 1.7/56 corrects coma quite well.
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| Corner, f/1.7 | Corner, f/2.5 | Corner, f/3.6 |
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Astigmatism, understood as an average difference between horizontal and vertical MTF50 function values, amounted to 6.8%. It's a value considered by us as low so not providing any reasons to complain.
Out-of-focus circles of light look very nice, with even light spread, without any distinct local extreme points. A brighter rim makes itself felt a bit, as its intensity increases with stopping down. Mechanical vignetting is also visible, especially at the maximum relative aperture, where the size of the circle in the frame corner is significantly diminished compared to its size in the centre. Still, that vignetting disappears completely on stopping down the aperture by 2 EV and it is a good piece of news.
| X-T30, f/1.7, centre | X-T30, f/1.7, Corner |
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| X-T30, f/2.5, centre | X-T30, f/2.5, Corner |
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| X-T30, f/3.6, centre | X-T30, f/3.6, Corner |
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