Canon PowerShot G7
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Written by Gordon Laing
Canon PowerShot G7 wide-angle geometry comparison
Canon PowerShot G7 results continued…
Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting
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 | To measure and compare the Canon PowerShot G7’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 or kit 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. | |
7.4-44.4mm at 7.4mm | ||
| The image above was taken with the Canon PowerShot G7 zoomed-out to 7.4mm. Barrel distortion was measured at 3.34% which while virtually identical to the EOS 400D / XTi’s kit lens, is measurably higher than both the PowerShot A640 and Panasonic DMC-FZ50. |
Canon PowerShot A640 |
Canon 400D / XTi (using EF-S 18-55mm) |
Panasonic DMC-FZ50 | ||
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7.3-29.2mm at 7.3mm Distortion: 2.48% barrel |
18-55mm EF-S at 18mm Distortion: 3.35% barrel |
7.4-88.8mm at 7.4mm Distortion: 2.56% barrel |
Canon PowerShot G7 telephoto geometry comparison
 | To measure and compare the Canon PowerShot G7’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 or kit 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. | |
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7.4-44.4mm at 44.4mm f5.6 Distortion: 0.28% pincushion | ||
| The image above was taken with the Canon PowerShot G7 zoomed-in to 44.4mm. Pincushion distortion was measured at 0.28% which is the best result of the cameras shown here, albeit not by a huge degree. |
Canon PowerShot A640 |
Canon 400D / XTi (using EF-S 18-55mm) |
Panasonic DMC-FZ50 | ||
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7.3-29.2mm at 29.2mm Distortion: 0.35% pincushion |
18-55mm EF-S at 55mm Distortion: 0.39% pincushion |
7.4-88.8mm at 88.8mm Distortion: 0.34% barrel |
