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Canon PowerShot A640 wide-angle geometry comparison
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To measure and compare the Canon PowerShot A640'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 built-in lenses at their
widest focal length; where possible, the aperture was closed.
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 Canon PowerShot A640 zoomed-out to 7.3mm. |
7.3-29.2mm at 7.3mm
Distortion: 2.48% barrel |
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| Barrel distortion was measured at 2.48% which is visibly worse than the Fujifilm F30 and Panasonic TZ1, although slightly better than the Sony N2. |
Fujifilm FinePix F30 |
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Panasonic Lumix DMC TZ1 |
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Sony Cybershot DSC N2 |
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8-24mm at 8mm
Distortion: 1.34% barrel |
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5.2-52mm at 5.2mm
Distortion: 0.98% barrel |
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7.9-23.7mm at 7.9mm
Distortion: 2.72% barrel |
Canon PowerShot A640 telephoto geometry comparison
 |
|
To measure and compare the Canon PowerShot A640'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 built-in lenses at their
longest focal length; where possible, the aperture was closed.
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 Canon PowerShot A640 zoomed-in to 29.2mm. |
7.3-29.2mm at 29.2mm
Distortion: 0.35% pincushion |
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| Pincushion distortion was measured at 0.35%, which again
is visibly greater than the Fujifilm F30 and Panasonic TZ1, and roughly the same as the Sony N2. |
Fujifilm FinePix F30 |
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Panasonic Lumix DMC TZ1 |
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Sony Cybershot DSC N2 |
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8-24mm at 24mm
Distortion: 0.17% pincushion |
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5.2-52mm at 52mm
Distortion: 0.12% pincushion |
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7.9-23.7mm at 23.7mm
Distortion: 0.38% pincushion |
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