Canon EF 70-200 mm f/4L USM review - Vignetting

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Canon EF 70-200 mm f/4L USM

22 September 2007

Arkadiusz Olech

8. Vignetting

We never anticipated any problems with vignetting on the APS-C detector for the full frame designed Canon 70-200. We were right! The problem almost doesn’t exist at all.

Canon EF 70-200 mm f/4L USM - Vignetting

At 70 mm focal length and open aperture the light fall off in the corners of the frame reaches as little as 8% (-0.24 value of the diaphragm) and is almost unnoticeable. When stopping down the lens to f/5.6 the vignetting decreases to 2%.

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The situation is roughly the same at 135 mm. At f/4 the light fall off in the corners reaches 9% and after stopping it down to f/5.6, it is again 2%.

The vignetting is a bit stronger at 200 mm focal length. For the open aperture the vignetting reaches 18% (-0.56 value of the diaphragm) but the efect decreased when stopping down the lens to f/5.6 and it is only 5%. At f/8 it drops even more to 2%.