LensTip.com

Lens review

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.

Canon EF 135 mm f/2L USM - Vignetting


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.

Canon EF 135 mm f/2L USM - Vignetting


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).

Canon EF 135 mm f/2L USM - Vignetting