Generally, some of the advantages of the Nikon D3X compared to entry-level DSLR competitors include: it is much less noisy at high ISO (1,992 ISO vs 977 ISO), has significantly better image quality (88.0 vs 73.0), has slightly more color depth (24.7 bits vs 22.7 bits), has a slightly higher resolution screen (920k dots vs 460k dots) and much larger viewfinder (0.70x vs 0.51x).
However, on average it slightly lower maximum light sensitivity (1,600 ISO vs 6,400 ISO), lacks a built in HDR feature, doesn't focus continuously while recording movies, lacks and external mic jack and lacks autofocus (none vs contrast detection).
Nikon D7000
1 year newer
$1,097 (body only)
$1,227 55-200mm lens
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Significant advantages of the D7000 (vs the D3X)
- Much smaller: Professional size 132x105x77 mm vs Large 160x157x88 mm
- Has an external mic jack
- Better maximum light sensitivity: 6,400 ISO vs 1,600 ISO
Significant disadvantages of the D7000 (vs the D3X)
- Much more noise at high ISO: 1,167 ISO vs 1,992 ISO
- Much shorter battery life: 1050 shots vs 4400 shots
- Much smaller sensor: APS-C 23.6x15.6mm vs Full frame 35.9x24.0mm
common strengths of the D7000 and D3X
- Very low noise at high ISO: 1,167 ISO vs 1,992 ISO
- Extremely good image quality: 80.0 vs 88.0
- Good color depth: 23.5 bits vs 24.7 bits
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Nikon D5100
2 years newer
$650 - $749 (body only)
$600 - $750 18-55mm lens
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Significant advantages of the D5100 (vs the D3X)
- Much smaller: Prosumer size 127x96x78 mm vs Large 160x157x88 mm
- Has an external mic jack
- Has a flip-out screen
Significant disadvantages of the D5100 (vs the D3X)
- Much more noise at high ISO: 1,183 ISO vs 1,992 ISO
- Much shorter battery life: 660 shots vs 4400 shots
- Much smaller sensor: APS-C 23.6x15.6mm vs Full frame 35.9x24.0mm
common strengths of the D5100 and D3X
- Very low noise at high ISO: 1,183 ISO vs 1,992 ISO
- Extremely good image quality: 80.0 vs 88.0
- Good color depth: 23.5 bits vs 24.7 bits
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Pentax K-5
1 year newer
$1,008 - $1,500 (body only)
$1,293 - $1,650 18-55mm lens
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Significant advantages of the K-5 (vs the D3X)
- Much smaller: Prosumer size 130x96x72 mm vs Large 160x157x88 mm
- Image stabilization: Sensor shift vs None
- Better maximum light sensitivity: 12,800 ISO vs 1,600 ISO
Significant disadvantages of the K-5 (vs the D3X)
- Much more noise at high ISO: 1,162 ISO vs 1,992 ISO
- Much shorter battery life: 740 shots vs 4400 shots
- Much smaller sensor: APS-C 23.6x15.7mm vs Full frame 35.9x24.0mm
common strengths of the K-5 and D3X
- Very low noise at high ISO: 1,162 ISO vs 1,992 ISO
- Extremely good image quality: 82.0 vs 88.0
- Good color depth: 23.7 bits vs 24.7 bits
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Nikon D3100
1 year newer
$500 - $984 18-55mm lens
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Significant advantages of the D3100 (vs the D3X)
- Much smaller: Prosumer size 124x96x73 mm vs Large 160x157x88 mm
- Much lighter: 505 g vs 1,260 g
- Video autofocus: Contrast detection vs None
Significant disadvantages of the D3100 (vs the D3X)
- Much more noise at high ISO: 919 ISO vs 1,992 ISO
- Much shorter battery life: 550 shots vs 4400 shots
- Much smaller sensor: APS-C 23.1x15.4mm vs Full frame 35.9x24.0mm
common strengths of the D3100 and D3X
- Relatively low noise at high ISO: 919 ISO vs 1,992 ISO
- Larger than average screens: 3.0" vs 3.0"
- Minimal startup delay: 400 ms vs 300 ms
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Nikon D90
3 months older
$869 - $897 (body only)
$1,099 - $1,200 18-105mm lens
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Significant advantages of the D90 (vs the D3X)
- Much smaller: Professional size 132x103x77 mm vs Large 160x157x88 mm
- More lenses available: 169 lenses vs 121 lenses
- Much lighter: 703 g vs 1,260 g
Significant disadvantages of the D90 (vs the D3X)
- Much more noise at high ISO: 977 ISO vs 1,992 ISO
- Much shorter battery life: 850 shots vs 4400 shots
- Much smaller sensor: APS-C 23.6x15.8mm vs Full frame 35.9x24.0mm
common strengths of the D90 and D3X
- Relatively low noise at high ISO: 977 ISO vs 1,992 ISO
- Good image quality: 73.0 vs 88.0
- Good dynamic range: 12.5 EV vs 13.7 EV
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Sigma SD1
1 year newer
$8,837 (body only)
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Significant advantages of the SD1 (vs the D3X)
- Much smaller: Professional size 146x113x80 mm vs Large 160x157x88 mm
- Better maximum light sensitivity: 6,400 ISO vs 1,600 ISO
- Much lighter: 706 g vs 1,260 g
Significant disadvantages of the SD1 (vs the D3X)
- Much smaller sensor: APS-C 23.5x15.7mm vs Full frame 35.9x24.0mm
- Many fewer focus points: 11 vs 51
- Many fewer cross-type focus points: 2 vs 15
common strengths of the SD1 and D3X
- Larger than average screens: 3.0" vs 3.0"
- Above average viewfinder size: 0.62x vs 0.70x
- Both are weather sealed, which is fairly uncommon among similar cameras
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