Generally, some of the advantages of the Nikon D90 compared to mirrorless interchangeable-lens competitors include: it has a viewfinder (pentaprism vs none), records movies in 24p, has much less startup delay (300 ms vs 1900 ms), has slightly less shutter lag (208 ms vs 441 ms) and much more lenses available (169 lenses vs 8 lenses).
However, on average it records lower quality movies (720p @ 24fps vs 1080p @ 60fps), takes slightly lower resolution photos (12.2 MP vs 16 MP), much lower maximum light sensitivity (3,200 ISO vs 25,600 ISO), doesn't have a touch screen and doesn't have a screen which flips out.
Sony NEX-5N
3 years newer
$598 - $600 (body only)
$698 - $700 18-55mm lens
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Significant advantages of the NEX-5N (vs the D90)
- Higher resolution movies: 1080p @ 60fps vs 720p @ 24fps
- Better maximum light sensitivity: 25,600 ISO vs 3,200 ISO
- Much smaller: Compact 111x59x38 mm vs Professional size 132x103x77 mm
Significant disadvantages of the NEX-5N (vs the D90)
- Much fewer lenses available: 8 lenses vs 169 lenses
- Much more startup delay: 1900 ms vs 300 ms
- No viewfinder: None vs Pentaprism
common strengths of the NEX-5N and D90
- Relatively low noise at high ISO: 1,079 ISO vs 977 ISO
- Good image quality: 77.0 vs 73.0
- High resolution screens: 920k dots vs 930k dots
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Sony Alpha NEX-5
1 year newer
$569 18-55mm lens
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Significant advantages of the NEX-5 (vs the D90)
- Higher resolution movies: 1080p @ 30fps vs 720p @ 24fps
- Much smaller: Compact 111x59x38 mm vs Professional size 132x103x77 mm
- Has a flip-out screen
Significant disadvantages of the NEX-5 (vs the D90)
- Much fewer lenses available: 8 lenses vs 169 lenses
- Much shorter battery life: 330 shots vs 850 shots
- No viewfinder: None vs Pentaprism
common strengths of the NEX-5 and D90
- Good image quality: 69.0 vs 73.0
- High resolution screens: 920k dots vs 930k dots
- Good dynamic range: 12.2 EV vs 12.5 EV
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