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

11 August 2011
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Arkadiusz Olech

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



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