differences

Advantages of the Canon 7D

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Movie format
Higher resolution movies
1080p @ 30fps vs 720p @ 24fps
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Shoots higher resolution Full HD (1080p) video at a higher frame rate
True resolution
Significantly higher true resolution
17.9 MP vs 12.1 MP
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Capture around 50% more detail in your photos
Size
Much smaller
148×111×74 mm vs 160×157×88 mm
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Around 50% smaller
Lens availability
More lenses available
220 lenses vs 171 lenses
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Around 30% more lenses available
Thickness
Much thinner
2.9" vs 3.5"
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Around 20% thinner
Weight
Lighter
860 g vs 1,240 g
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More than 30% lighter
Built-in flash
Built-in flash
Yes vs No
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A built-in flash is useful for taking indoor shots where there is little light
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Advantages of the Nikon D3S

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Low light performance
Much lower noise at high ISO
3,253 ISO vs 854 ISO
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The D3S has excellent image quality: 1.9 f-stops higher ISO than the 7D
Overall image quality
Significantly better image quality
82.0 vs 66.0
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More than 20% better image quality
Color depth
Better color depth
23.5 bits vs 22 bits
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Distinguishes 1.5 more bits of color
Battery life
Much longer battery life
4200 shots vs 800 shots
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Around 5.5x more shots per battery charge
Viewfinder size
Larger viewfinder
0.70x vs 0.62x
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Around 30% larger viewfinder
Dynamic range
More dynamic range
12 EV vs 11.7 EV
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0.6 f-stops more dynamic range
Focus points
More focus points
51 vs 19
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Set focus accurately within the frame
Storage slots
Has more storage slots
2 vs 1
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More slots allows storing more images without switching memory cards
Built-in focus motor
Has a built-in focus motor
Yes vs No
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Autofocuses with all autofocus lenses
Continuous shooting
Shoots slightly faster
9 fps vs 8 fps
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More than 10% faster continuous shooting
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recommendations

Which camera do we recommend? Relative to the best recent pro DSLRs, and ignoring price

Snapsort Recommends
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        131 Nikon D3S Placeholder
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              similarities

              Compared to recent DSLRs

              Common Strengths
              Weather sealed Weather sealed Help
              Shoot in extreme weather
              Viewfinder Both have pentaprism viewfinders Help
              Pentaprism
              Viewfinder coverage Above average viewfinder coverage Help
              100%
              Fastest shutter speed Fast max shutter speeds Help
              1/8000 of a second
              Common Weaknesses
              HDR Neither has in-camera HDR Help
              You could do HDR manually
              Autofocus No video autofocus Help
              Manual focus only
              GPS No built-in GPS Help
              Missing geo-tagging
              True resolution Capture low resolution images Help
              7D17.9 MP
              D3S12.1 MP
              Image stabilization No image stabilization Help
              Risk of blur
              Touch screen No touchscreens Help
              More buttons
              Screen flips out No flip-out screens Help
              Less flexible
              Screen size Very small screens Help
              3"
              Light sensitivity Poor maximum light sensitivity Help
              7D6,400 ISO
              D3S12,800 ISO
              Screen resolution Low resolution screens Help
              7D920k dots
              D3S921k dots

              Compared to recent pro DSLRs

              Common Strengths
              Dynamic range Good dynamic range Help
              7D11.7 EV
              D3S12 EV
              Common Weaknesses
              Focus points Few focus points Help
              7D19
              D3S51
              Movie format Poor movies Help
              7D1080p @ 30fps
              D3S720p @ 24fps

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              discussion

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              EOS 7D
              Canon

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              D3S
              Nikon

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