Sony Alpha DSLR-A100 review with DT 18-70mm f3.5~5.6

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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Sony Alpha A100 wide-angle geometry test   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
Canon EOS 350D wide-angle geometry test
Konica Minolta 5D wide-angle geometry test
Sony R1 wide-angle geometry test
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

Sony Alpha A100 telephoto geometry test   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
Canon EOS 350D telephoto geometry test
Konica Minolta 5D telephoto geometry test
Sony R1 telephoto geometry test
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
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