Canon PowerShot A640 - Canon PowerShot A640 wide-angle uniformity comparison

Canon PowerShot A640 wide-angle uniformity comparison


Canon PowerShot A640 results

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

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Canon A640 wide angle uniformity  

To measure and compare the Canon PowerShot A640’s lens vignetting and light fall-off we photographed a white target with a highly diffused custom filter using it and a number of rival models.

Here are the results for each camera with their built-in lenses set to their widest focal lengths with the apertures wide open and the focus set to infinity.

The images were analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

The image left was taken with the Canon PowerShot A640 zoomed-out to 7.3mm with its aperture wide open.

7.3-29.2mm at 7.3mm f2.8
Mean corner fall-off: 67%
 

Here the light falls off in the corners to an average of 67% of the center measurement, which is below the results of the other cameras tested here. That said, it’s not so bad you’d notice it in most day-to-day shots, but the Fujifilm F30 and Sony N2 are both comfortably superior in this respect.

Fujifilm FinePix F30
Panasonic Lumix DMC TZ1
Sony Cybershot DSC N2
Fujifilm F30 wide angle uniformity
Panasonic TZ1 wide angle uniformity
Sony N2 wide angle uniformity

8-24mm at 8mm f2.8
Mean corner fall-off: 80.8%

  5.2-52mm at 5.2mm f2.8
Mean corner fall-off: 72.8%
  7.9-23.7mm at 7.9mm f2.8
Mean corner fall-off: 79.6%


Canon PowerShot A640 telephoto uniformity comparison

Canon A640 telephoto uniformity  

To measure and compare the Canon PowerShot A640’s lens vignetting and light fall-off we photographed a white target with a highly diffused custom filter using it and a number of rival models.

Here are the results for each camera with their built-in lenses set to their longest focal lengths with the apertures wide open and the focus set to infinity.

The images were analysed with Imatest and the full areas presented here at a reduced resolution. Bigger percentages are better.

The image left was taken with the Canon PowerShot A640 zoomed-in to 29.2mm with its aperture wide open.

7.3-29.2mm at 29.2mm f4.1
Mean corner fall-off: 77.7%
 

Here the light falls off in the corners to an average of 77.7% of the center measurement, which while again the worst result of the group, would still be hardly noticeable in general-use. Once again the Fujifilm F30 and Sony N2 deliver the best results in this test.

Fujifilm FinePix F30
Panasonic Lumix DMC TZ1
Sony Cybershot DSC N2
Fujifilm F30 telephoto uniformity
Panasonic TZ1 telephoto uniformity
Sony N2 telephoto uniformity

8-24mm at 24mm f5
Mean corner fall-off: 88.1%

  5.2-52mm at 52mm f4.2
Mean corner fall-off: 81.8%
  7.9-23.7mm at 23.7mm f5.4
Mean corner fall-off: 86.9%
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