Comment by wao0uuno

Yeah kinda. Amount of light per area is the same but smaller sensors have smaller pixels that have worse SNR. This means the sensor receives the same amount of light per area but still needs to boost the signal more because of smaller pixels. I believe that if a full frame camera and MFT camera with the same pixel pitch and lens existed it would get exactly the same SNR and exposure. So basically with smaller sensors DOF is increased, exposure remains the same, SNR gets worse.