Incidentally, the imaging area of a Four Thirds sensor is almost identical to that of 110 film. The sensor's area is about 30–40% smaller than APS-C sensors used in most other DSLRs, but still around 9 times larger than the 1/2.5" sensors typically used in compact digital cameras. The usual size of the sensor is 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.63 mm diagonal).
Sizes of the sensors used in most current digital cameras relative to a standard 35mm frame The imaging area of a Four Thirds sensor is equal to that of a video camera tube of 4/3 inch diameter. The common inch-based sizing system is derived from vacuum image-sensing video camera tubes, which are now obsolete. The name of the system stems from the size of the image sensor used in the cameras, which is commonly referred to as a 4/3" type or 4/3 type sensor. Sensor size and aspect ratio Drawing showing the relative sizes of sensors used in most current digital cameras, including Four Thirds System The image sensor format, between those of larger SLRs and smaller point-and-shoot compact digital cameras, yields intermediate levels of cost, performance, and convenience. Thus, the Four Thirds System has crop factor (focal length multiplier) of about 2, and while this enables longer focal length for greater magnification, it does not necessarily aid the manufacture of wide angle lenses. For example, a Four Thirds lens with a 300 mm focal length would cover about the same angle of view as a 600 mm focal length lens for the 35 mm film standard, and is correspondingly more compact. The size of the sensor is significantly smaller than for most DSLRs and this implies that lenses, especially telephoto lenses, can be smaller.
Lens design has been tailored to the requirements of digital sensors, most notably through telecentric designs. Many lenses are extensively computerised, to the point that Olympus offers firmware updates for many of them. Unlike older single-lens reflex (SLR) systems, Four Thirds was designed from the start to be entirely digital. Proponents describe it as an open standard, but companies may use it only under a non-disclosure agreement. Patent 6,910,814 seems to cover the standard. The system provides a standard that, with digital cameras and lenses available from multiple manufacturers, allows for the interchange of lenses and bodies from different manufacturers. The Four Thirds System is a standard created by Olympus and Eastman Kodak for digital single-lens reflex camera (DSLR) and mirrorless camera design and development. Please help update this article to reflect recent events or newly available information. The reason given is: needs to cover more accurately the fall-off in availability.
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