Tokina AF 193 19-35 mm f/3.5-4.5 review - Vignetting

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Tokina AF 193 19-35 mm f/3.5-4.5

27 July 2010

Arkadiusz Olech

8. Vignetting

Taking into account the fact that we deal here with a full frame design, the Tokina 19-35 mm doesn’t deserve much praise. When we use it on small APS-C/DX sensors the problem of the light fall-off in the frame corners won’t be especially serious although it is still noticeable.

Tokina AF 193 19-35 mm f/3.5-4.5 - Vignetting

The biggest problems we will encounter near 19 mm focal length. At the maximum relative aperture the vignetting reaches the level of 28% (-0.95 aperture value). On stopping down to f/4.0 we don’t see the situation improving because the brightness loss in the frame corners is still as much as 24% then. By f/5.6 we deal with the value of 18% and by f/8.0 – 12%. Only by f/11 we can reduce the vignetting to an imperceptible level of 8%.

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A better situation is at 28 mm. By f/4.0 the light fall-off amounts to 23% (-0.76 aperture value) and on stopping down to f/5.6 it decreases to 15%. By using f/8 aperture we can get rid of the problem because the level of this aberration decreases to 10%.

The nicest performance in this category can be noticed at 35 mm. At the maximum relative aperture the vignetting reaches 20% (-0.63 aperture value) and by f/5.6 it decreases to 13%. On using f/8 aperture the light fall-off in the frame corners is just 8%.