I am relatively new to Micro 4/3, so I was wondering how the 1/3 stop ISOs on these cameras are produced. In most Canon DSLRs, the intermediate ISO steps (i.e. 1000, 1250) are generated by the camera pushing or pulling an exposure taken at a standard ISO (in this case, ISO 1000=ISO 800 pushed 1/3 stop and ISO 1250=ISO 1600 pulled down by 1/3 stop). This can cause an increase in noise (in the case of 125) or a clipping of highlights (in the case of 160). Pro level cameras like the Canon 1D series have a secondary amplification circuit to produce "true" 1/3 stop ISOs straight off the sensor, so these cameras are not affected. Does anyone know how the Micro 4/3 cameras generate their 1/3 ISOs?