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Kit lens wide-angle geometry: Canon EOS 400D / XTi vs Nikon D80 vs Sony A100
To measure wide angle geometric distortion we photographed a test chart consisting
of a grid pattern with perfectly straight lines. The kit lenses were tested
at their widest focal length with an aperture of f8 in
Aperture Priority mode. The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution.
Zoomed-out to wide-angle, the Canon and Sony kit lenses exhbit roughly the same degree of barrel distortion, but the Nikkor DX 18-70mm is almost 50% worse with quite obvious bending of straight lines in comparison.
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Canon 400D / XTi
Using EF-S 18-55mm |
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Nikon D80
Using DX 18-70mm |
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Sony A100
Using DT 18-70mm |
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18-55mm at 18mm f8
Distortion: 3.35% barrel |
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18-70mm at 18mm f8
Distortion: 5.02% barrel |
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18-70mm at 18mm f8
Distortion: 3.6% barrel |
Kit lens telephoto geometry: Canon EOS 400D / XTi vs Nikon D80 vs Sony A100
To measure telephoto geometric distortion we photographed a test chart consisting
of a grid pattern with perfectly straight lines. The kit lenses were tested
at their longest focal length with an aperture of f8 in
Aperture Priority mode. The images were analysed with Imatest using 5th
Order line calculation and the full areas presented here at a reduced resolution.
The Sony kit lens leads here although the Canon's not far behind. Again though the Nikkor DX 18-70mm delivers the highest distortion of the group. Since we're talking fractions of a percentage though, the difference between them isn't particularly noticeable in real life.
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Canon 400D / XTi
Using EF-S 18-55mm |
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Nikon D80
Using DX 18-70mm |
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Sony A100
Using DT 18-70mm |
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18-55mm at 55mm f8
Distortion: 0.389% pincushion |
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18-70mm at 70mm f8
Distortion: 0.59% pincushion |
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18-70mm at 70mm f8
Distortion: 0.27% pincushion |
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