Sensor Sizes, why it matters...

Type Aspect Ratio Diameter Diagonal Width Height Area Crop Factor PX per sq mm
1/3.6" 4:3 7.06 5.00 4.00 3.00
12.00
8.65
1/3.2" 4:3 7.94 5.68 4.54 3.42
15.49
7.62
1/3" 4:3 8.47 6.00 4.80 3.60
17.28
7.21
1/2.7" 4:3 9.41 6.59 5.27 3.96
20.87
6.56

1/2.5" Canon SD850

4:3 7.82 5.76 5.29
30.47
5.53
262222
1/2" 4:3 12.70 8.00 6.40 4.80
30.72
5.41
1/1.8" 4:3 14.11 8.93 7.18 5.32
38.17
4.84
1/1.7" Samsung NV8 4:3   9.50 7.60 5.70
43.32
4.55

184672

2/3" 4:3 16.93 11.00 8.80 6.60
58.08
3.93
1" 4:3 25.40 16.00 12.80 9.60
122.88
2.70
4/3" 4:3 33.87 22.50 18.00 13.50
243.00
1.92
Foveon (Sigma) 3:2   24.88 20.70 13.80
285.66
1.74
Canon 40D 10.5MP 3:2   26.68 22.20 14.80
328.56
1.62
31958
Nikon D200 10.92MP 3:2 28.40 23.60 15.80
372.88
1.52
29286
Nikon D300 13.1MP 3:2   28.40 23.60 15.80
372.88
1.52
35132
Canon 1D Mk111 10.7MP 3:2   33.75 28.10 18.70
525.47
1.28
20363
Nikon D700 12.87MP 3:2   43.21 36.00 23.90
860.40
1.00
14958
Nikon FX D3 12.87MP 3:2   43.21 36.00 23.90
860.40
1.00
14958
Canon 5D Mk11 21.1MP 3:2   43.27 36.00 24.00
864.00
1.00
24421
Canon 1DS Mk111 21.1MP 3:2   43.27 36.00 24.00
864.00
1.00
24421
6x4.5 20MP 4:3 69.70 56.00 41.50
2324.00
N/A
8606

In blue the sensor area, in red the pixels per square mm - the ability to resolve is greater the less dense (improvements in technology aside)

Purple - actual cameras at full sensor size, Green - my kit!

The diameter refers to the old picture tubes...

In a nutshell, the Nikon D3 sensor is 19.86 times bigger than my NV8 compact and it has 12 times less density (i.e. less crammed-up) on it's chip! (It's also 34 times more expensive!)

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