Nikon Nikkor AF 20 mm f/2.8D
8. Vignetting
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We still remember a very painful slip-up of the Canon 2.8/20 in this category; it was even stranger as that lens was designed for full frame. Let’s remind here that by f/2.8 the Canon had the vignetting on the level of 32%. The Nikon 2.8/20, tested here, for a change can boast of vignetting amounting to…32% (-1.1 f stop!). The result is as bad as that of the Canon because the difference in physical dimensions of the Canon’s 20D and the Nikon’s D200 sensor is negligible. The Nikkor fares a tad better than he Canon on stopping down to f/4.0. The Canon had the brightness loss in the frame corners of 15% and the Nikkor – by 4% less. Only by implementing f/5.6 aperture we see the vignetting reduced to an imperceptible level. It’s awful to imagine what happens on full frame but for the owners of Nikon’s dSLRs it is a purely theoretical problem as that company in its digital line-up offers also reflex cameras with a sensor the size of a 35 mm film.
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