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Tamron 18-200mm uniformity, wide angle, tested with Nikon D2X
| To measure lens vignetting and light fall-off we photographed a white
target with a highly diffused filter. The lenses were tested at their
widest focal length with the aperture wide open using a Nikon D2X in Aperture
Priority mode. The images were analysed with Imatest and the full areas
presented here at a reduced resolution. Bigger percentages are better. With light falling off to an average of 52.6% in the corners, the Tamron scores almost identically to the Sigma, although both are noticeably worse than the Nikkor model. Light fall-off in the corners would be much more apparent on these cheaper lenses at wide angle. |
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF
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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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| 18-200mm at 18mm f3.5 Mean corner fall-off: 52.6% |
18-200mm at 18mm f3.5 Mean corner fall-off: 62.2% |
18-200mm at 18mm f3.5 Mean corner fall-off: 53% |
Tamron 18-200mm uniformity, telephoto, tested with Nikon D2X
| To measure lens vignetting and light fall-off we photographed a white
target with a highly diffused filter. The lenses were tested at their
longest focal length with the aperture wide open using a Nikon D2X in Aperture
Priority mode. The images were analysed with Imatest and the full areas
presented here at a reduced resolution. Bigger percentages are better. Zoomed-in to their longest 200mm focal lengths, all three lenses perform quite similarly, although the Tamron takes the lead in this test. |
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF
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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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| 18-200mm at 200mm f6.3 Mean corner fall-off: 79.7% |
18-200mm at 200mm f5.6 Mean corner fall-off: 73.4% |
18-200mm at 200mm f6.3 Mean corner fall-off: 72.9% |
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