Canon EF 135 mm f/2L USM review - Vignetting

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Canon EF 135 mm f/2L USM

3 October 2011

Arkadiusz Olech

8. Vignetting

When we use the small APS-C sensor the vignetting is not a big problem – you can notice it in the photos below.

At the maximum relative aperture the brightness loss in the frame corners gets to 22% (-0.72 EV) so is moderate. Implementing f/2.8 aperture value makes the problem disappear practically completely because then the vignetting decreases to an imperceptible level of 7% (-0.22 EV).

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Some difficulties appear when we start working on full frame. The thumbnails below show them perfectly well.

When you use the maximum relative aperture you have to make do with the vignetting on the level of as much as 49% (-1.97 EV). Fortunately on stopping down the aperture the results improve significantly. By f/2.8 the light fall-off in the frame corners is 26% (-0.88 EV) and by f/4.0 it decreases to 15% (-0.48 EV). The vignetting disappears completely only by f/5.6 where it reaches the level of 7% (-0.20 EV).