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Pentax *istDL review with 18-55mm f3.5~5.6 DA lens Gordon Laing, December 2005


 



 




Outdoor
/ Resolution / Noise / Corner sharpness / Fringe and macro / Geometry / Vignetting

Pentax *istDL wide-angle uniformity comparison

Pentax *istDL wide-angle uniformity test   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.

Canon EOS-350D
Konica Minolta Dynax 5D
Nikon D50
Canon EOS 350D wide angle uniformity test
Konica Minolta wide angle uniformity test
Nikon D50 wide angle uniformity test
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

Pentax *istDL telephoto uniformity test   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.

Canon EOS-350D
Konica Minolta Dynax 5D
Nikon D50
Canon EOS 350D telephoto uniformity test
Konica Minolta telephoto uniformity test
Nikon D50  telephoto uniformity test
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%

Results continued...

Outdoor / Resolution / Noise / Corner sharpness / Fringe and macro / Geometry / Vignetting


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