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Canon PowerShot A640 corner sharpness comparison
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To measure and compare the Canon PowerShot A640's corner sharpness we photographed the Enhanced Digital Camera
Resolution Chart with it and a number of rival models, each using their
best quality JPEG and default image tone and sharpening settings.
We used the built-in lenses at their widest and longest focal lengths and
with various apertures starting from fully open. Note the Panasonic TZ1 and Sony N2 only offer two and three apertures respectively at each focal length, so all their settings are shown in this test.
The crops are taken from
the extreme lower left corner of the chart and presented here at 100%. |
Zoomed-out to wide angle, the A640 delivers pretty good results in its corners with only a small hint of coloured fringing, and a slight softness with the aperture wide open. Zoom-into telephoto and the fringing virtually disappears, although again there's slight softness with the aperture wide open.
Overall there's little to worry about here with the A640 delivering well-corrected corner performance, and comparing favourably against its rivals.
Note: crop details which appear smaller here are
due to them being captured with lower resolution cameras and / or a lens
which couldn't focus as close to the chart. In each case though, the crop
still represents the extreme left corner of each camera's frame. |
Canon PowerShot A640 |
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Fujifilm FinePix F30 |
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Panasonic DMC-TZ1 |
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Sony Cybershot DSC-N2 |
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7.3-29.2mm at 7.3mm f2.8 |
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8-24mm at 8mm f2.8 |
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5.2-52mm at 5.2mm f2.8 |
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7.9-23.7mm at 7.9mm f2.8 |
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7.3-29.2mm at 7.3mm f5.6 |
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8-24mm at 8mm f5.6 |
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5.2-52mm at 5.2mm f5 |
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7.9-23.7mm at 7.9mm f4 |
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7.3-29.2mm at 7.3mm f8 |
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8-24mm at 8mm f8 |
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Only two aperture settings available |
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7.9-23.7mm at 7.9mm f8 |
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Canon PowerShot A640 |
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Fujifilm FinePix F30 |
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Panasonic DMC-TZ1 |
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Sony Cybershot DSC-N2 |
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7.3-29.2mm at 29.2mm f4.1 |
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8-24mm at 24mm f5.0 |
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5.2-52mm at 52mm f4.2 |
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7.9-23.7mm at 23.7mm f5.4 |
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7.3-29.2mm at 29.2mm f5.6 |
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8-24mm at 24mm f5.6 |
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5.2-52mm at 52mm f7.1 |
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7.9-23.7mm at 23.7mm f8 |
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7.3-29.2mm at 29.2mm f8 |
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8-24mm at 24mm f8 |
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Only two aperture settings available |
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7.9-23.7mm at 23.7mm f16 |
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