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Lens review

Canon EF 8-15 mm f/4 L Fisheye USM

11 August 2011
Szymon Starczewski

8. Vignetting

The vignetting question is answered easily for most of focal lengths and aperture combinations. Where we see dark corners, the vignetting is precisely 100%. The issue becomes more interesting at longer focal lengths and on the APS-C sensor. The photos below show how the situation looks at 12 and 15 mm.

Canon EF 8-15 mm f/4 L Fisheye USM - Vignetting


In the middle of the focal lengths’ range and at the maximum relative aperture the brightness loss in the frame corners is 22% (-0.71 EV). It becomes negligible (only 6%) already on stopping down to f/5.6. A quite similar situation can be seen at 15 mm. When the lens is wide open the vignetting reaches 20% (-0.66 EV) and by f/5.6 it decreases to 5% (-0.16 EV).

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Canon EF 8-15 mm f/4 L Fisheye USM - Vignetting