Canon PowerShot A640
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Written by Gordon Laing
Canon PowerShot A640 wide-angle geometry comparison
Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting
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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 | ||
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 |
Panasonic Lumix DMC TZ1 |
Sony Cybershot DSC N2 | ||
8-24mm at 8mm |
5.2-52mm at 5.2mm Distortion: 0.98% barrel |
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 | ||
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 |
Panasonic Lumix DMC TZ1 |
Sony Cybershot DSC N2 | ||
8-24mm at 24mm |
5.2-52mm at 52mm Distortion: 0.12% pincushion |
7.9-23.7mm at 23.7mm Distortion: 0.38% pincushion |