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Nikkor 18-200mm geometry, wide angle, tested with Nikon D2X
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To measure geometric distortion we photographed a test chart consisting
of a grid pattern with perfectly straight lines. The lenses were tested
at their widest focal length with an aperture of f8 using a Nikon D2X 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.
All three lenses exhibited roughly the same degree of barrel distortion
at their wide angle setting, although the Sigma model managed the best result
here. |
Nikkor AF-S DX VR 18-200mm 3.5-5.6G IF-ED |
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Sigma 18-200mm F3.5-6.3 DC |
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF |
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18-200mm at 18mm f8
Distortion: 5.26% barrel |
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18-200mm at 18mm f8
Distortion: 4.46% barrel |
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18-200mm at 18mm f8
Distortion: 5.38% barrel |
Nikkor 18-200mm geometry, telephoto, tested with Nikon D2X
To measure geometric distortion we photographed a custom test chart consisting
of a grid pattern with perfectly straight lines. The lenses were tested
at their longest focal length with an aperture of f8 using a Nikon D2X 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.
All three lenses exhibited roughly the same degree of pincushion distortion
when zoomed-into 200mm, although in contrast to the wide-angle result, the
Sigma scored worst here. |
Nikkor AF-S DX VR 18-200mm 3.5-5.6G IF-ED |
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Sigma 18-200mm F3.5-6.3 DC |
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF |
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18-200mm at 200mm f8
Distortion: 1.22% pincushion |
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18-200mm at 200mm f8
Distortion: 1.76% pincushion |
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18-200mm at 200mm f8
Distortion: 1.19% pincushion |
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