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Canon PowerShot A640 purple fringing comparison
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To measure and compare the Canon PowerShot A640's purple fringing caused by lens chromatic aberrations and sensor
blooming, we photographed a test chart with areas of very high contrast
using it and a number of rival models.
We used the built-in lenses at their widest and longest focal lengths with
the apertures wide open. The crops are taken
from the upper left corner of the chart and presented here at 100%.
In this particular test, the Canon A640 performed similarly to the Fujifilm F30 and Sony N2, with all three exhibiting roughly similar degrees of coloured fringing at their focal extremes; note the Panasonic TZ1 is impressively bereft of almost any fringing. |
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 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 |
Canon PowerShot A640 macro comparison
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To measure and compare the Canon PowerShot A640's macro performance we photographed
a custom chart using it and a number of rival models with their bundled
lenses.
Each camera was positioned at a distance and set to a focal length which
delivered the maximum possible reproduction.
The dark lines are 10mm apart and the result is not cropped. Smaller areas
are preferred in this test.
The image left was taken with the Canon PowerShot A640 in its Macro mode. |
7.3-29.2mm at 7.3mm
Max area of 24x18mm |
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Switch the Canon A640 to its macro mode and you can focus as close as 1cm with the lens zoomed-out to wide angle. This allows it to capture areas as small as 24x18mm which is noticeably superior to any other compact we've tested. While there's inevitably some geometric distortion at close range and also the risk of casting shadows on your subject, the A640 allows for some impressive close-up photography. See our Gallery for an example. |
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
Max area of 56x42mm |
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5.2-52mm at 10mm
Max area of 40x30mm |
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7.9-23.7mm at 7.9mm
Max area of 66x50mm |
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