Viltrox AF 85 mm f/1.4 Pro
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 make our test more interesting and comprehensive we decided to show photos of night sky taken from the left-hand upper corner of full frame. In this case coma is far more pronounced but you have to remember the fact that we chose a very bright, significantly overexposed star. A lot of light turned into these characteristic 'wings' that are a result of off-axis aberrations of higher degrees. At the same time a slight comma, connected almost completely to classic coma, remains visible even by f/2.8.
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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 horizontal and vertical MTF50 function values, amounted to just 5.7%, a value on the borderline between very low and low level. In this category the Viltrox fares better than both the Meike 1.4/85 and the expensive Sony FE 85 mm f/1.4 GM II.
The appearance of out-of-focus images is very pleasant, with even spread of light inside the circles. Of course you can notice a slight onion-ring structure connected to one aspherical element inside the construction. Mechanical vignetting is a bit bigger problem – it makes itself felt even on stopping down the aperture by 2 EV.
Still, in this category the Viltrox loses to the Meike. In the optical construction of its rival there are no aspherical elements so the Meike doesn't how any traces of onion-ring bokeh and it is especially visible on more distinct stopping down of the aperture. For a change the smaller Viltrox shows a lower level of mechanical vignetting.
| 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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