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Canon EF 20 mm f/2.8 USM

12 April 2010
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Arkadiusz Olech

8. Vignetting

In this category we see a huge slip-up. Dealing with a full frame lens we expected low vignetting on the APS-C sensor of our Canon 20D. We couldn’t be further from the truth, though. By f/2.8 the vignetting amounts to as much as 32% so –1.1 aperture value. On stopping down the lens to f/4.0 the light fall-off in the frame corners decreases to 15%. Only using f/5.6 relative aperture makes the vignetting on the APS-C sensor fall to practically not bothersome level of 11%.

Canon EF 20 mm f/2.8 USM - Vignetting


If the vignetting on APS-C can be as much as 32% we are afraid to think what happens on full frame…


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Canon EF 20 mm f/2.8 USM - Vignetting



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