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Sony Vario-Sonnar T* DT 16-80mm f3.5-4.5 ZA Gordon Laing, August 2007

More results : Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting

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Sony DT 16-80mm vs Sony DT 18-70mm wide-angle uniformity comparison

To compare the vignetting and light fall-off of the Sony DT 16-80mm against the DT 18-70mm at their shortest focal lengths, we photographed a white target with a highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

Light falls off to 53.4% of the maximum when it reaches the corners of the Sony DT 16-80mm when it's zoomed-out to 16mm. This is measurably worse than the 63.3% of the kit lens when it's zoomed-out. So you may notice slight darkening in the corners of some wide angle shots taken with the DT 16-80mm, although again to be fair it's roughly the same as Canon's EF-S 17-85mm while boasting wider coverage.

Sony DT 16-80mm
Using Sony Alpha A100
Sony DT 18-70mm
Using Sony Alpha A100
Sony 16-80mm at 16mm f3.5
Sony 18-70mm at 18mm f3.5
16-80mm at 16mm f3.5
Mean corner fall-off: 53.4 %
18-70mm at 18mm f3.5
Mean corner fall-off: 63.3%


Sony DT 16-80mm vs Sony DT 18-70mm telephoto uniformity comparison

To compare the vignetting and light fall-off of the Sony DT 16-80mm against the DT 18-70mm at their longest focal lengths, we photographed a white target with a highly diffused filter; each lens was focused to infinity with its aperture wide open. The images were then analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

With the DT 16-80mm zoomed-into its longest focal length, the light falls-off to 71.8% of the maximum in the corners. The kit lens beats it comfortably in this respect, although the DT 16-80mm has a longer range and a brighter maximum aperture when zoomed-in; you're also unlikely to notice any light fall-off with it in practice when zoomed-in. Now for some real-life results, let's head on over to our Sony DT 16-80mm sample images.


Sony DT 16-80mm
Using Sony Alpha A100
Sony DT 18-70mm
Using Sony Alpha A100
Sony 16-80mm at 80mm f4.5
Sony 18-70mm at 70mm f5.6
16-80mm at 80mm f4.5
Mean corner fall-off: 71.8 %
18-70mm at 70mm f5.6
Mean corner fall-off: 87.7%

Sony DT 16-80mm lens results

Outdoor / Resolution / Corner sharpness / Fringe and macro / Geometry / Vignetting
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