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Kit lens wide-angle uniformity: Canon EOS 400D / XTi vs Nikon D80 vs Sony A100
To measure wide angle lens vignetting and light fall-off we photographed a white
target with a highly diffused filter. The kit lenses were tested at their
widest focal length with the aperture wide open in Aperture
Priority mode. The images were analysed with Imatest and the full areas
presented here at a reduced resolution. Bigger percentages are better.
Once again the Canon and Sony kit lenses deliver roughly similar results, with the Nikkor trailing behind. The Nikkor DX 18-70mm really is noticeably darker in the corners than its rivals.
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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 f3.5
Mean corner fall-off: 68.8% |
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18-70mm at 18mm f3.5
Mean corner fall-off: 41.5% |
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18-70mm at 18mm f3.5
Mean corner fall-off: 63.3% |
Kit lens telephoto uniformity: Canon EOS 400D / XTi vs Nikon D80 vs Sony A100
To measure telephoto lens vignetting and light fall-off we photographed a white
target with a highly diffused filter. The kit lenses were tested at their
longest focal length with the aperture wide open in Aperture
Priority mode. The images were analysed with Imatest and the full areas
presented here at a reduced resolution. Bigger percentages are better.
Again the Canon and Sony lenses deliver roughly the same result with the Nikkor coming in far behind. The vignetting may not be as pronounced as at wide angle, but it's still obviously darker in the corners than the Canon and Sony. To be fair though, the Nikkor lens is 2/3 of a stop brighter at its telephoto end, and it's also longer than the Canon.
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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 f5.6
Mean corner fall-off: 83.8% |
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18-70mm at 70mm f4.5
Mean corner fall-off: 55.4% |
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18-70mm at 70mm f5.6
Mean corner fall-off: 87.7% |
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