Canon PowerShot A640 purple fringing comparison
Canon PowerShot A640 results continued…
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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
Fujifilm FinePix F30
Sony Cybershot DSC-N2
7.3-29.2mm at 7.3mm f2.8
8-24mm at 8mm f2.8
5.2-52mm at 5.2mm f2.8
7.9-23.7mm at 7.9mm f2.8
7.3-29.2mm at 29.2mm f4.1
8-24mm at 24mm f5.0
5.2-52mm at 52mm f4.2
7.9-23.7mm at 23.7mm f5.4
Canon PowerShot A640 macro comparison
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
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
Panasonic Lumix DMC TZ1
Sony Cybershot DSC N2
8-24mm at 8mm
5.2-52mm at 10mm|
Max area of 40x30mm
7.9-23.7mm at 7.9mm|
Max area of 66x50mm