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Lens review

Canon EF 50 mm f/1.2L USM

10 August 2010
Szymon Starczewski

8. Vignetting

Looking at the photos below we can assess how the tested lens fares when it comes to the brightness loss in the frame corners of the APS-C sensor, depending on the aperture used.

Canon EF 50 mm f/1.2L USM - Vignetting


The vignetting will be noticeable, but not very bothersome, only near the maximum relative aperture. By f/1.2 it amounts to 29% (-0.97 EV) and by f/1.4 it decreases to 24%. Implementing the f/2.0 aperture will make the problem disappear completely because the light fall-off in the frame corners is just 9% there. The full frame performance is much worse though. The miniatures, shown below, will help us assess it better.

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Canon EF 50 mm f/1.2L USM - Vignetting


At the maximum relative aperture we lose as much as 67% of light (-3.24 EV) in the full frame corners. By f/1.4 the situation doesn’t improve a lot because the vignetting still amounts to 61% there. A significant improvement can be noticed after stopping down the lens to f/2.0 because the brightness loss reaches 39%. By f/2.8 the vignetting decreases to 20% and by f/4.0 – to an imperceptible level of 10%.

On the one hand the 50L should be praised because the cheaper EF 50mm f/1.4 has higher vignetting when wide open than the faster L device, tested here. On the other hand, though, the new Nikkor AF-S 1.4/50 fares better in this category than the tested lens…


Canon EF 50 mm f/1.2L USM - Vignetting