Pentax *istDL review with 18-55mm f3.5~5.6 DA lens
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Written by Gordon Laing
Pentax *istDL wide-angle geometry comparison
Canon EOS-350D |
Konica Minolta Dynax 5D |
Nikon D50 | ||
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18-55mm EF-S at 18mm f8 Distortion: 3.35% barrel |
18-70mm DT at 18mm f8 Distortion: 3.49% barrel |
18-55mm DX at 18mm f8 Distortion: 3.51% barrel |
Pentax *istDL telephoto geometry comparison
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To measure geometric distortion we photographed a custom test chart consisting of a grid pattern with perfectly straight lines. Here are the results for the bundled lenses at their longest focal length with an aperture of f8 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. The image left was taken with the Pentax *istDL and the 18-55mm DA at 55mm f8. Pincushion distortion was measured at 0.58% which while barely noticeable, remains the worst of the group. |
Canon EOS-350D |
Konica Minolta Dynax 5D |
Nikon D50 | ||
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18-55mm EF-S at 55mm f8 Distortion: 0.389% pincushion |
18-70mm DT at 70mm f8 Distortion: 0.309% pincushion |
18-55mm DX at 55mm f8 Distortion: 0.169% barrel |
Results continued…
Outdoor / Resolution / Noise / Corner sharpness / Fringe and macro / Geometry / Vignetting
