Film & Sensor Sizes

The naming scheme for digital camera sensors is derived from old television camera sizes expressed as the diameter of the tube through which light enters to strike the sensor at the end of the tube. The sensor’s diagonal measurement is about one third less than that of the tv camera tube so camera sensor diagonal measurements are smaller than you might expect from their names.
43-sensor010
Camera with a Four Thirds Sensor: Micro Four Thirds cameras are mirrorless.
Here are a few film and sensor dimensions, and their relative sizes compared to 35mm film and full frame digital sensors.
Type Format Dimensions (mm) Surface Ratio to 35mm
Width Height mm²
film 4×5 121 97 11737 1358%
film 645 56 42 2352 272%
Sensor 645 43.8 32.8 1436.6 166%
Sensor Full Frame 36 24 864 100%
Sensor APS-C 22.3 14.9 332.27 38%
Sensor four thirds sensor 17.3 13 224.9 26%
Sensor 2/3″ 8.8 6.6 58.08 7%
Sensor 1/1.6″ 8 6 48 6%
Sensor 1/1.8″ 7.2 5.3 38.16 4%
Sensor 1/2.7″ 5.3 4 21.2 2%

 

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