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. This authoritative guide from professional photographer David Taylor gives in-depth, jargon-free information on the pros and cons of this pioneering system. It includes reviews of popular Four Thirds and Micro Four Thirds cameras as well as advice on choosing lenses and accessories, guidance on exposure and flash and practical tips on lighting and camera care.