Canon EF 300 mm f/2.8 L IS II USM review - Vignetting

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Canon EF 300 mm f/2.8 L IS II USM

3 February 2012

Arkadiusz Olech

8. Vignetting

As you can notice looking at the thumbnails, posted below, the vignetting on the small sensor of the Canon 50D shouldn’t bother you at all.

Canon EF 300 mm f/2.8 L IS II USM - Vignetting

Our measurements confirm it completely. Even at the maximum relative aperture the brightness loss in the frame corners can hardly be considered bothersome because it is only 17% (-0.54 EV). The problems disappears completely already by f/4.0 where the light fall-off reaches only 3% (-0.17 EV).

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Now let’s check what the situation is for a more demanding full frame sensor.

There are of course more problems but, taking into account the size of the detector, the results still remain decent. At the maximum relative aperture the vignetting amounts to 35% (-1.26 EV) and can be perceived without any problem. It decreases already by f/4.0 to the level of 15% (-0.46 EV), though, becoming definitely less problematic. The vignetting disappears almost completely by f/5.6, where we had the value of 7% (-0.22 EV).