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Sony DT 16-80mm vs Sony DT 18-70mm wide-angle geometry comparison
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To compare the geometric distortion of the Sony DT 16-80mm against the 18-70mm at their shortest focal lengths, we photographed a test chart consisting of a grid pattern
at an aperture of f8.
The images were then analysed with Imatest using 5th Order line calculation and
the full areas presented here at a reduced resolution. Smaller percentages are better.
Zoomed-out to 16mm, the Sony DT 16-80mm exhibited 4.03% barrel distortion which is slightly worse than the DT 18-70mm kit lens at 18mm, although it's not a massive difference and barely noticeable in practice; to be fair, the DT 16-80mm of course also offers wider coverage. |
Sony DT 16-80mm
Using Sony Alpha A100 |
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Sony DT 18-70mm
Using Sony Alpha A100 |
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16-80mm at 16mm f8
Distortion: 4.03% barrel |
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18-70mm at 18mm f8
Distortion: 3.6% barrel |
Sony DT 16-80mm vs Sony DT 18-70mm telephoto geometry comparison
To compare the geometric distortion of the Sony DT 16-80mm against the DT 18-70mm at their longest focal lengths, we photographed a test chart consisting of a grid pattern
at an aperture of f8.
The images were then analysed with Imatest using 5th Order line calculation and
the full areas presented here at a reduced resolution. Smaller percentages are better.
Zoomed-into its longest focal length, the Sony DT 16-80mm exhibits 0.52% pincushion distortion, which is measurably worse than the kit lens when it's zoomed-in. It's not terrible by any means though, especially when compared to other 5x lenses with similar ranges; the Canon EF-S 17-85mm for example exhibits 0.967% pincushion distortion when zoomed-in. Our final results page tests the Sony DT 16-80mm light fall-off. |
Sony DT 16-80mm
Using Sony Alpha A100 |
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Sony DT 18-70mm
Using Sony Alpha A100 |
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16-80mm at 80mm f8
Distortion: 0.52% pincushion |
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18-70mm at 70mm f8
Distortion: 0.27% pincushion |
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