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Canon PowerShot G7 Gordon Laing, February 2007

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

 
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Canon PowerShot G7 purple fringing comparison

  To measure and compare the Canon PowerShot G7'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 or kit 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 PowerShot G7 exhibited similar degrees of coloured fringing to its rivals. It's visible in the corners at wide angle, but there's little to worry about when zoomed-in.

Canon PowerShot G7
Canon PowerShot A640
Canon 400D / XTi
(using EF-S 18-55mm)
Panasonic DMC-FZ50
Canon PowerShot G7 at 7.4mm f2.8
Canon PowerShot A640 at 7.3mm f2.8
Canon 400D with 18-55mm at 18mm f3.5
Panasonic DMC-FZ50 at 7.4mm f2.8
7.4-44.4mm at 7.4mm f2.8
7.3-29.2mm at 7.3mm f2.8
18-55mm EF-S at 18mm f3.5
7.4-88.8mm at 7.4mm f2.8
Canon PowerShot G7 at 44.4mm f4.8
Canon PowerShot A640 at 29.2mm f4.1
Canon 400D with 18-55mm at 55mm f5.6
Panasonic DMC-FZ50 at 88.8mm f3.7
7.4-44.4mm at 44.4mm f4.8
7.3-29.2mm at 29.2mm f4.1
18-55mm EF-S at 55mm f5.6
7.4-88.8mm at 88.8mm f3.7


Canon PowerShot G7 macro comparison

Canon PowerShot G7 macro test  

To measure and compare the Canon PowerShot G7's macro performance we photographed a custom chart using it and a number of rival models with their built-in or kit 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 G7 in its Macro mode.

7.4-44.4mm at 7.4mm
Max area of 36x26 mm
 

The PowerShot G7 is an excellent macro performer, capable of focusing as close as 1cm with the lens zoomed-out. While an impressive facility, it's actually very difficult to get this close in real life without casting shadows on the subject. Indeed our result above was as close as we could comfortably get without causing lighting issues, although the G7 was optically capable of focusing a little closer still. So while the area above of 36x26mm is below that of the A640, we're confident it can match or at least come close to the same result. Unsurprisingly there's noticeable geometric distortion under these conditions, but by zooming in a notch or two and slightly increasing your distance, you can enjoy optically superior results. At a focal length of 17mm, we managed to capture a larger area of 52x40mm, but with virtually no distortion. Either way, the G7 is capable of superb macro results as also demonstrated in our Gallery.


Canon PowerShot A640
Canon 400D / XTi
(using EF-S 18-55mm)
Panasonic DMC-FZ50
Canon PowerShot A640 macro test
Canon 400D with 18-55mm macro test
Panasonic DMC-FZ50 macro test
7.3-29.2mm at 7.3mm
Max area of 24x18mm
  18-55mm EF-S at 55mm
Max area of 66x44mm
  7.4-88.8mm at 7.4mm
Max area of 60x42mm

Canon PowerShot G7 results continued...

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