Mitakon Speedmaster 85 mm f/1.2
8. Vignetting
| Nikon D7000, f/1.2 | Nikon D7000, f/1.4 |
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There is no need to worry – not yet anyway. At the maximum relative aperture the light fall-off in the frame corners amounts to 24% (−0.78 EV) and can be called moderate. By f/1.4 the vignetting decreases to 18% (−0.56 EV) and the problem disappears practically completely on stopping down the aperture to f/2.0 where that aberration decreases to an imperceptible value of 4% (−0.12 EV).
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Now let’s check the situation on full frame.
| Nikon D3x, f/1.2 | Nikon D3x, f/1.4 |
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| Nikon D3x, f/2.0 | Nikon D3x, f/2.8 |
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Employing the maximum relative aperture you have to take into account the loss of 45% of light (−1.73 EV) in the frame corners. It is not a low value but still the Mitakon is better than the Canon which lost as much as 51% of light. By f/1.4 the vignetting decreases to 40% (−1.49 EV). Once again that value is quite high but you should remember that the huge Otus by f/1.4 lost as much as 56% of light! The Samyang 1.4/85 fared better for a change because it lost only 38% of light when wide open.
A moderate vignetting level you see by f/2.0 where we got 23% (−0.76 EV). The problem disappears completely by f/2.8 reaching only 7% (−0.22 EV).
In this category once again the Mitakon fares better than the Canon 1.2/85 II and the Zeiss Otus 1.4/85.
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