Canon EF 300 mm f/4L IS USM
8. Vignetting
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The light fall-off in the corners on a small APS-C sensor is not a problem. By f/4.0 the vignetting level amounts to only 12% (-0.38 EV) and decreases to 2% by f/5.6. After using the converter the performance is even better because even at maximum aperture the brightness loss in the corners amounts to only 6% (-0.17 EV).
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