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Corner sharpness, tested with Nikon D2X
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To measure corner sharpness we photographed
the Enhanced Digital Camera Resolution Chart with each lens using a Nikon
D2X in Aperture Priority mode. The D2X was set to Large Fine JPEG mode,
optimised for quality rather than size, and with A for Image Sharpening
and Tone Compensation. Each lens was tested at its widest and longest focal lengths and with various apertures using Aperture Priority mode. The crops are taken from the lower left corner of the chart and presented here at 100%. The 18mm crops show a larger area of the chart because minimum focusing distances forced us to shoot it from further away. |
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At the 18mm wide angle end, the Sigma visibly delivers the poorest result here, although to be fair both it and the Tamron samples improved considerably just a short distance in from the extremes. The story is also the same at the 200mm telephoto end, with both the Tamron and Nikkor out-performing the Sigma. |
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Sigma 18-200mm F3.5-6.3 DC
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Nikkor AF-S DX VR 18-200mm 3.5-5.6G IF-ED
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF
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18-200mm at 18mm f3.5
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18-200mm at 18mm f3.5
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18-200mm at 18mm f3.5
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18-200mm at 18mm f8
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18-200mm at 18mm f8
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18-200mm at 18mm f8
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18-200mm at 18mm f16
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18-200mm at 18mm f16
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18-200mm at 18mm f16
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Sigma 18-200mm F3.5-6.3 DC
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Nikkor AF-S DX VR 18-200mm 3.5-5.6G IF-ED
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Tamron AF18-200mm F3.5-6.3 XR Di-II LD IF
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18-200mm at 200mm f6.3
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18-200mm at 200mm f5.6
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18-200mm at 200mm f6.3
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18-200mm at 200mm f8
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18-200mm at 200mm f8
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18-200mm at 200mm f8
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18-200mm at 200mm f16
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18-200mm at 200mm f16
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18-200mm at 200mm f16
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