The standard defines the sensor size, the lens mount together with the communication protocol, the aspect ratio and the flange back distance, as well as the optical requirements for production and construction. The industry standard has been developed deliberately without taking into account conventional lenses, cameras or sensor sizes. In this way, compatibility problems with older components are avoided as is the need to compromise when designing new components.
The forum standard policy means that any member company can make and distribute accessories for the system that meet the standard. It is therefore possible to combine components from different manufacturers.