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Compared to... Canon PowerShot G7

Below you will find a studio comparison between the Canon PowerShot A640 and the Canon PowerShot G7 at ISO 800.

Studio scene comparison (@ ISO 800)

  • Canon PowerShot A640: Aperture Priority mode (F5.0), ISO 800, Default Image Parameters, Manual white balance, +0.7 EV compensation
  • Canon PowerShot G7: Aperture Priority mode, ISO 800, Default Image Parameters,
    Manual white balance, +0.67 EV compensation
  • Lighting: Daylight simulation, >98% CRI
Canon PowerShot A640
Canon PowerShot G7
ISO 800, 1/500 sec, F5.0
ISO 800, 1/640 sec, F5.0
6,014 KB JPEG
4,485 KB JPEG

More of the same; the differences are obviously down to noise reduction - the G7's is more effective but there is a price to pay in the areas of low contrast detail (such as the watch face), and in the final analysis it's hard to say which is the better - I wouldn't use either for anything serious. Our experience of the ISO 800 setting in the real world was that it produces images that are very noisy in the shadows (though better in decent light), and which - if you produce small prints and nothing else - are usable as long as you don't expect miracles.

It's also worth noting that the G7 appears to be marginally more sensitive at ISO 400 and ISO 800 than the A640.

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