DxOMark Derived Measured ISO I currently own two camera bodies: Olympus PEN E-PM2 and Panasonic DMC-G5. Last night I noticed my Panasonic body is more sensitive to light than the Olympus body. I was taking star trails, @ISO200 on Olympus, @ISO160 on Panasonic on two different nights. The same lens was used at the same aperture, and I expected the images from the Panasonic to include less number of stars; however it was the opposite. E-PM2 at ISO200: DMC-G5 ISO160: It could've been the transparency issue, but I did a quick google search and found the link above. According to DxO, Olympus body's ISO setting is displayed as twice as it actually is (I may have worded it wrong, for the lack of knowledge). I assumed the ISO value to be an international convention; meaning ISO400 is the light sensitivity of the sensor that is going to be the same for all the sensors. Looking at the graph, Panasonic was actually taking photos at ISO160, while Olympus was taking photos at ISO100 (although the settings were showing ISO 200). Can anyone explain what is actually going on? To my understanding so far, Olympus messed up the ISO settings on their system. This may have been discussed somewhere else, but I can't find the thread, so I am starting this one.