Generally, some of the advantages of the Canon SD780 IS compared to other ultra compact competitors include: it has better image stabilization (lens vs none), takes significantly higher resolution photos (9.8 MP vs 7.1 MP), has a marginally larger sensor (1/2.3" 6.2x4.6mm vs 1/2.5" 5.8x4.3mm) and has higher quality type of viewfinder (tunnel vs none).
However, on average it has a slightly narrower aperture (f/3.2 vs f/2.8), has a significantly narrower wide angle lens (33 mm vs 28 mm), has a slightly smaller screen (2.5" vs 3.0"), has a CCD-family sensor (CCD vs CMOS) and is older (february, 2009 vs february, 2010).
Canon PowerShot SD940 IS
6 months newer
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Significant advantages of the SD940 IS (vs the SD780 IS)
- Much better wide angle: 28 mm vs 33 mm
- Lighter: 120 g vs 160 g
Significant disadvantages of the SD940 IS (vs the SD780 IS)
- No viewfinder: None vs Tunnel
common strengths of the SD940 IS and SD780 IS
- Good image stabilization: Lens vs Lens
- Capture very high resolution images: 9.8 MP vs 9.8 MP
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Canon PowerShot SD1400 IS
1 year newer
$225
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Significant advantages of the SD1400 IS (vs the SD780 IS)
- Much better wide angle: 28 mm vs 33 mm
Significant disadvantages of the SD1400 IS (vs the SD780 IS)
- No viewfinder: None vs Tunnel
common strengths of the SD1400 IS and SD780 IS
- Good image stabilization: Lens vs Lens
- Capture very high resolution images: 9.8 MP vs 9.8 MP
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Canon PowerShot ELPH 520 HS
2 years newer
$279
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Significant advantages of the ELPH 520 HS (vs the SD780 IS)
- Much better wide angle: 28 mm vs 33 mm
- Much larger screen: 3.0" vs 2.5"
- Significantly more zoom: 12x vs 3x
Significant disadvantages of the ELPH 520 HS (vs the SD780 IS)
- No viewfinder: None vs Tunnel
common strengths of the ELPH 520 HS and SD780 IS
- Good image stabilization: Lens vs Lens
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Canon PowerShot SD1000
2 years older
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Significant advantages of the SD1000 (vs the SD780 IS)
Significant disadvantages of the SD1000 (vs the SD780 IS)
- Much lower true resolution: 7.1 MP vs 9.8 MP
- No image stabilization: None vs Lens
- Much smaller sensor: 1/2.5" 5.8x4.3mm vs 1/2.3" 6.2x4.6mm
common strengths of the SD1000 and SD780 IS
- Both have tunnel viewfinders: Tunnel vs Tunnel
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