Generally, some of the advantages of the Canon S1 IS compared to entry-level DSLR competitors include: it has image stabilization (lens vs none), lets you preview your photos on the screen, has a screen which flips out, is much smaller (standard size 111x78x66 mm vs professional size 142x99x72 mm) and is thinner (2.6" vs 3.1").
However, on average it has a much smaller screen (1.5" vs 2.5"), has a slightly lower resolution screen (114k dots vs 1,040k dots), takes much lower resolution photos (3.1 MP vs 12.2 MP), slightly lower maximum light sensitivity (400 ISO vs 3,200 ISO) and doesn't record movies in 24p.
Canon Rebel T3i
7 years newer
$624 - $800 (body only)
$869 - $1,100 18-135mm lens
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Significant advantages of the T3i (vs the S1 IS)
- Much larger screen: 3.0" vs 1.5"
- Much larger sensor: APS-C 22.3x14.9mm vs 1/3.6" 5.3x4.0mm
- Much higher true resolution: 17.9 MP vs 3.1 MP
Significant disadvantages of the T3i (vs the S1 IS)
- No image stabilization: None vs Lens
- Much larger: Professional size 133x99x79 mm vs Standard size 111x78x66 mm
- Significantly thicker: 3.1" vs 2.6"
common strengths of the T3i and S1 IS
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Canon EOS Digital Rebel XS
4 years newer
$369 - $595 (body only)
$449 - $469 18-55mm lens
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Significant advantages of the Rebel XS (vs the S1 IS)
- Much larger screen: 2.5" vs 1.5"
- Much larger sensor: APS-C 22.2x14.8mm vs 1/3.6" 5.3x4.0mm
- Much higher true resolution: 10.1 MP vs 3.1 MP
Significant disadvantages of the Rebel XS (vs the S1 IS)
- No image stabilization: None vs Lens
- Screen does not flip out
- Significantly larger: Prosumer size 126x98x65 mm vs Standard size 111x78x66 mm
common strengths of the Rebel XS and S1 IS
- Fairly small: Prosumer size 126x98x65 mm vs Standard size 111x78x66 mm
- Thin: 2.6" vs 2.6"
- Light weight: 502 g vs 469 g
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Nikon D5000
5 years newer
$750 - $997 18-55mm lens
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Significant advantages of the D5000 (vs the S1 IS)
- Much larger screen: 2.7" vs 1.5"
- Much larger sensor: APS-C 23.6x15.8mm vs 1/3.6" 5.3x4.0mm
- Faster autofocus: Phase detection vs Contrast detection
Significant disadvantages of the D5000 (vs the S1 IS)
- No image stabilization: None vs Lens
- Much larger: Professional size 127x104x80 mm vs Standard size 111x78x66 mm
- Significantly thicker: 3.1" vs 2.6"
common strengths of the D5000 and S1 IS
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Canon EOS Digital Rebel XT
1 year newer
$769 18-55mm lens
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Significant advantages of the Rebel XT (vs the S1 IS)
- Much larger sensor: APS-C 22.2x14.8mm vs 1/3.6" 5.3x4.0mm
- Much larger screen: 1.8" vs 1.5"
- Shoots RAW
Significant disadvantages of the Rebel XT (vs the S1 IS)
- No image stabilization: None vs Lens
- Screen does not flip out
- Larger: Prosumer size 127x94x64 mm vs Standard size 111x78x66 mm
common strengths of the Rebel XT and S1 IS
- Very small: Prosumer size 127x94x64 mm vs Standard size 111x78x66 mm
- Thin: 2.5" vs 2.6"
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Canon EOS Digital Rebel
5 months older
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Significant advantages of the Rebel (vs the S1 IS)
- Much larger sensor: APS-C 22.7x15.1mm vs 1/3.6" 5.3x4.0mm
- Much larger screen: 1.8" vs 1.5"
- Shoots RAW
Significant disadvantages of the Rebel (vs the S1 IS)
- No image stabilization: None vs Lens
- Screen does not flip out
- Much larger: Professional size 142x99x72 mm vs Standard size 111x78x66 mm
common strengths of the Rebel and S1 IS
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