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Sony DT 11-18mm vs DT 18-70mm geometry, shortest focal length
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To compare the geometric distortion of the Sony DT 11-18mm against the DT 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 11mm, the Sony DT 11-18mm exhibits 3.87% barrel distortion which is actually pretty similar to the kit lens when it's zoomed-out. The important difference here though is the DT 11-18mm is capturing a much greater area. This is however a similar result to the Canon EF-S 10-22mm when its zoomed-out. |
Sony DT 11-18mm
Using Sony Alpha A100 |
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Sony DT 18-70mm
Using Sony Alpha A100 |
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11-18mm at 11mm f8
Distortion: 3.87% barrel |
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18-70mm at 18mm f8
Distortion: 3.6% barrel |
Sony DT 11-18mm vs DT 18-70mm geometry, longest focal length
To compare the geometric distortion of the Sony DT 11-18mm 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 11-18mm exhibits 0.94% barrel distortion, which is more noticeable than the 0.27% pincushion distortion of the kit lens when it's zoomed-in. Of course the fairer comparison is with both lenses at 18mm, where the DT 11-18mm and DT 18-70mm exhibit 0.94% and 3.6% of barrel distortion respectively. So if you own both lenses and are shooting at 18mm, the DT 11-18mm will deliver less geometric distortion. Our final results page tests the Sony DT 11-18mm light fall-off.
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Sony DT 11-18mm
Using Sony Alpha A100 |
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Sony DT 18-70mm
Using Sony Alpha A100 |
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11-18mm at 18mm f8
Distortion: 0.94% barrel |
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18-70mm at 70mm f8
Distortion: 0.27% pincushion |
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