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Pentax *istDL wide-angle uniformity comparison
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To measure lens vignetting and light
fall-off we photographed a white target with a highly diffused custom filter.
Here are the results for the bundled lenses at their widest focal lengths
with the apertures wide open in Aperture Priority mode. The images were
analysed with Imatest and the full areas presented here at a reduced resolution. The image left was taken with the Pentax *istDL and the 18-55mm DA at 18mm f3.5. The light falls off to an average of 61.8% in the corners, which is much worse than the three budget rivals below. Vignetting remains visible even at f8. |
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Canon EOS-350D
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Konica Minolta Dynax 5D
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Nikon D50
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| 18-55mm EF-S at 18mm f3.5 Mean corner fall-off: 68.8% |
18-70mm DT at 18mm f3.5 Mean corner fall-off: 73.5% |
18-55mm DX at 18mm f3.5 Mean corner fall-off: 81% |
Pentax *istDL telephoto uniformity comparison
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To measure lens vignetting and light
fall-off we photographed a white target with a highly diffused custom filter.
Here are the results for the bundled lenses at their longest focal lengths
with the apertures wide open in Aperture Priority mode. The images were
analysed with Imatest and the full areas presented here at a reduced resolution. The image left was taken with the Pentax *istDL and the 18-55mm DA at 55mm f5.6. The light falls off to an average of 81.1% in the corners, which while similar to the Canon lens, is worse then the Konica Minolta and Nikon results. |
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Canon EOS-350D
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Konica Minolta Dynax 5D
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Nikon D50
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| 18-55mm EF-S at 55mm f5.6 Mean corner fall-off: 83.8% |
18-70mm DT at 70mm f5.6 Mean corner fall-off: 90.1% |
18-55mm DX at 55mm f5.6 Mean corner fall-off: 90.3% |
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