Generally, some of the advantages of the Sony DSLR-A900 compared to mirrorless interchangeable-lens competitors include: it is significantly less noisy at high ISO (1,431 ISO vs 1,016 ISO), has higher quality type of viewfinder (pentaprism vs none), has image stabilization (sensor shift vs none), takes significantly higher resolution photos (24.4 MP vs 16 MP) and has a weather sealed body.
However, on average it doesn't record movies (none vs 1080p @ 60fps), much lower maximum light sensitivity (1,600 ISO vs 25,600 ISO), doesn't have a touch screen, doesn't have a screen which flips out and doesn't let you preview your photos on the screen.
Sony NEX-7
2 years newer
$1,200 (body only)
$1,350 - $1,499 18-55mm lens
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Significant advantages of the NEX-7 (vs the DSLR-A900)
- Shoots movies: 1080p @ 60fps vs None
- Much smaller: Compact 111x59x38 mm vs Large 156x117x82 mm
- Has live view
Significant disadvantages of the NEX-7 (vs the DSLR-A900)
- No weather sealing
- Much shorter battery life: 430 shots vs 880 shots
- Significantly more noise at high ISO: 1,016 ISO vs 1,431 ISO
common strengths of the NEX-7 and DSLR-A900
- Relatively low noise at high ISO: 1,016 ISO vs 1,431 ISO
- Extremely good image quality: 81.0 vs 79.0
- High resolution screens: 921k dots vs 921k dots
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Sony NEX-5N
2 years newer
$598 - $600 (body only)
$698 - $700 18-55mm lens
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Significant advantages of the NEX-5N (vs the DSLR-A900)
- Shoots movies: 1080p @ 60fps vs None
- Much smaller: Compact 111x59x38 mm vs Large 156x117x82 mm
- Better maximum light sensitivity: 25,600 ISO vs 1,600 ISO
Significant disadvantages of the NEX-5N (vs the DSLR-A900)
- No weather sealing
- Much more startup delay: 1900 ms vs 500 ms
- Much shorter battery life: 460 shots vs 880 shots
common strengths of the NEX-5N and DSLR-A900
- Relatively low noise at high ISO: 1,079 ISO vs 1,431 ISO
- Good image quality: 77.0 vs 79.0
- High resolution screens: 920k dots vs 921k dots
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