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Old 19th November 2015
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Re: U43 format - why 1/4 FF

The 4/3rds system was designed (I believe) around a telecentric model whereby light at the edges of the frame was (nearly) perpendicular to the sensor as CCD sensors suffered severe performance loss with incident light. This meant that the exit lens and the sensor must be of similar size. To have gone for a bigger sensor would have meant that the rear of the lens would be much bigger and so impact the overall compactness of the system. The telecentric design meant that the system punched well above its weight in terms of sensor size. The switch to CMOS sensors half way through the system lifespan meant that incident light falloff is not so much an issue but it was too late by then to change. MFT specifications are based on the 4/3rds specifications hence the same size sensors.
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