Sony Alpha DSLR-A100 review with DT 18-70mm f3.5~5.6
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Written by Gordon Laing
Sony Alpha DSLR-A100 wide-angle geometry comparison, using DT 18-70mm
Sony Alpha A100 results continued…
Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting
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To measure and compare the Sony DSLR-A100’s geometric distortion we photographed a test chart consisting of a grid pattern, using it and a number of rival models. Here are the results for each camera with their bundled lenses at their widest focal length and an aperture of f8 set 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 above was taken with the Sony Alpha DSLR-A100 using the DT 18-70mm lens at 18mm f8. Barrel distortion was measured at 3.6% which is comparable to rival digital SLR kit lenses at wide angle. |
Canon EOS-350D |
Konica Minolta 5D |
Sony Cyber-shot DSC-R1 | ||
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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 |
14.3-71.5mm at 14.3mm f8 Distortion: 2.9% barrel |
Sony Alpha DSLR-A100 telephoto geometry comparison, using DT 18-70mm
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To measure and compare the Sony DSLR-A100’s geometric distortion we photographed a test chart consisting of a grid pattern, using it and a number of rival models. Here are the results for each camera with their bundled lenses at their longest focal length and an aperture of f8 set 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 above was taken with the Sony Alpha DSLR-A100 using the DT 18-70mm lens at 70mm f8. Pincushion distortion was measured at 0.27%, which again is comparable to most rival digital SLR kit lenses. These results are however beaten by the almost perfect telephoto geometry of the Sony R1. |
Canon EOS-350D |
Konica Minolta 5D |
Sony Cyber-shot DSC-R1 | ||
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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 |
14.3-71.5mm at 71.5mm f8 Distortion: 0.0082% pincushion |
