Generally, some of the advantages of the Nikon D90 compared to mirrorless interchangeable-lens competitors include: it is slightly less noisy at high ISO (977 ISO vs 346 ISO), has slightly better image quality (73.0 vs 54.0), has higher quality type of viewfinder (pentaprism vs none), has slightly more color depth (22.7 bits vs 21.3 bits) and has slightly wider dynamic range (12.5 EV vs 11 EV).
However, on average it records lower quality movies (720p @ 24fps vs 1080p @ 60fps), doesn't record high-speed movies (none vs 1,200 fps), significantly lower maximum light sensitivity (3,200 ISO vs 25,600 ISO), doesn't have a touch screen and doesn't shoot as fast continuously (4.5 fps vs 60 fps).
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
- Has a flip-out screen
- Much smaller: Compact 111x59x38 mm vs Professional size 132x103x77 mm
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
- Relatively low noise at high ISO: 796 ISO vs 977 ISO
- Good image quality: 69.0 vs 73.0
- High resolution screens: 920k dots vs 920k dots
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Sony NEX-5N
3 years newer
$599 - $600 (body only)
$698 - $699 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
- Video autofocus: Contrast detection vs None
Significant disadvantages of the NEX-5N (vs the D90)
- Much fewer lenses available: 8 lenses vs 169 lenses
- Much shorter battery life: 460 shots vs 850 shots
- Much more startup delay: 1900 ms vs 300 ms
common strengths of the NEX-5N and D90
- Very 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 920k dots
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Nikon 1 V1
3 years newer
$847 10-30mm lens
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Significant advantages of the V1 (vs the D90)
- Video autofocus: Phase detection vs None
- Records high-speed movies: 1,200 fps vs None
- Higher resolution movies: 1080p @ 60fps vs 720p @ 24fps
Significant disadvantages of the V1 (vs the D90)
- Much fewer lenses available: 4 lenses vs 169 lenses
- Much more noise at high ISO: 346 ISO vs 977 ISO
- Much shorter battery life: 350 shots vs 850 shots
common strengths of the V1 and D90
- High resolution screens: 921k dots vs 920k dots
- Viewfinders: Digital vs Pentaprism
- Both use faster phase detection autofocus which is uncommon: Phase detection vs Phase detection
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