Tokina AT-X PRO FX SD 70-200 f/4 VCM-S
8. Vignetting
At 70 mm and by f/4.0 aperture the brightness loss in the frame corners is just 10% (-0.31 EV), decreasing to 2% (-0.05 EV) on stopping down to f/5.6. In the middle of the focal range the situation looks even better – at the maximum relative aperture the vignetting amounts to 8% (-0.25 EV), decreasing to 2% (-0.05 EV) on stopping down to f/5.6. The biggest chance to notice any vignetting you get at the maximum relative aperture where, by f/4.0, that aberration reaches 15% (-0.45 EV). On stopping down to f/5.6 you see the vignetting disappear completely, being just 4% (-0.13 EV).
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The situation changes a bit on full frame – which is understandable – but even there you find no reasons to complain.
At 70 mm focal length and by f/4.0 the vignetting reaches 23% (-0.74 EV) so it still can be called moderate. The results improve a lot by f/5.6 where that aberration decreases to 14% (-0.42 EV) and by f/8.0 where it is only 6% (-0.17 EV).
Employing 135 mm focal length and f/4.0 aperture you must take into account a light fall-off of 21% (-0.67 EV). Stopping down the aperture to f/5.6 that value decreases to 12% (-0.37 EV). By f/8.0 the vignetting won’t be any problem at all, reaching just 5% (-0.15 EV).
At the maximum focal length you get almost the same situation as at the shortest one. The vignetting, while the lens is wide open, amounts to 23% (-0.77 EV) and decreases to 14% (-0.43 EV) on stopping down to f/5.6. By f/8.0 the vignetting is only 5% (-0.15 EV).
The results of the Tokina in this category are very good, especially when you compare them to the performance of the rival Nikkor; that lens’s vignetting in the 135-200 mm range could exceed even 30%.
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