Nikon Nikkor AF-S DX 12-24 mm f/4G IF-ED
8. Vignetting
At 12 mm and maximum relative aperture nothing announces serious problems yet because the brightness loss in the frame corners amounts to 32% (-1.13 EV) – high but typical for this kind of devices. Stopping down helps but not to a satisfactory level: by f/5.6 the vignetting reaches 23%, by f/8.0 it is still 15% and only by f/11 it nears the level of 10%, which we consider imperceptible.
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Longer focal lengths are the area where the Tokina dominates over the Nikkor. The latter at 18 mm and by f/4.0 shows 31% (-1.08 EV) of light fall-off in the frame corners. Fortunately for this focal length the stopping down helps a lot because by f/5.6 we descend to the level of 15% and by f/8.0 we get only 9%.
The worst situation is at 24 mm where, by f/4.0, we get the vignetting of 38% (-1.38 EV) which, by f/5.6, decreases to 20% and only by f/8.0 it reaches an imperceptible level of 10%.
The fact, that the Sigma 10-20 mm doesn’t fare better in this category either can be some consolation for the Nikkor owners.
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