The Four-Thirds system is an innovative, open standard for
digital SLR cameras that is designed to optimize their size,
performance, compatibility, and extendibility. Standardization of
lens mounts enables photographers to mix and match interchangeable
lenses and camera bodies from different makers. Because lenses
traditionally optimized for film cameras don't always perform well
with the digital camera's image sensor (the device that captures
light in the form of electrical signals), the Four Thirds system
introduced by Olympus and Kodak was the first digital-dedicated
design. Four Thirds lenses are highly computerized and tailored to
the requirements of digital cameras. Small size sensors mean that
lenses and camera bodies can also be lighter in weight and
extremely compact. Zoom lenses, in particular, pack impressive
specifications into petite size. The latest development, Micro Four
Thirds, devised by Olympus and Panasonic for mirrorless
interchangeable-lens digital cameras, reduces size even
further.
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