Canon PowerShot A640 - Canon PowerShot A640 corner sharpness comparison

Canon PowerShot A640 corner sharpness comparison


Canon PowerShot A640 results continued…

Outdoor / Resolution / Noise / Noise 2 / Corner sharpness / Fringe & macro / Geometry / Vignetting

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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
Fujifilm FinePix F30
Panasonic DMC-TZ1
Sony Cybershot DSC-N2
Canon A640 at 7.3mm f2.8
Fujifilm F30 at 8mm f2.8
Panasonic TZ1 at 5.2mm f2.8
Sony N2 at 7.9mm f2.8
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
Canon A640 at 7.3mm f5.6
Fujifilm F30 at 8mm f5.6
Panasonic TZ1 at 5.2mm f5
Sony N2 at 7.9mm f4
7.3-29.2mm at 7.3mm f5.6
8-24mm at 8mm f5.6
5.2-52mm at 5.2mm f5
7.9-23.7mm at 7.9mm f4
Canon A640 at 7.3mm f8
Fujifilm F30 at 8mm f8
Panasonic TZ1 - only two aperture settings available
Sony N2 at 7.9mm f8
7.3-29.2mm at 7.3mm f8
8-24mm at 8mm f8
Only two aperture settings available
7.9-23.7mm at 7.9mm f8
             
Canon PowerShot A640
Fujifilm FinePix F30
Panasonic DMC-TZ1
Sony Cybershot DSC-N2
Canon A640 at 29.2mm f4.1
Fujifilm F30 at 24mm f5
Panasonic TZ1 at 52mm f4.2
Sony N2 at 23.7mm f5.4
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 A640 at 29.2mm f5.6
Fujifilm F30 at 24mm f5.6
Panasonic TZ1 at 52mm f7.1
Sony N2 at 23.7mm f8
7.3-29.2mm at 29.2mm f5.6
8-24mm at 24mm f5.6
5.2-52mm at 52mm f7.1
7.9-23.7mm at 23.7mm f8
Canon A640 at 29.2mm f8
Fujifilm F30 at 24mm f8
Panasonic TZ1 - only two aperture settings available
Sony N2 at 23.7mm f16
7.3-29.2mm at 29.2mm f8
8-24mm at 24mm f8
Only two aperture settings available
7.9-23.7mm at 23.7mm f16
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