Originally Posted by daniel browning (Post 1485415)

that's true, but the trade off is 1/3 stop clipped highlights. For example, when you set the camera to iso 160, what it actually does behind the scenes is use iso 200 (metered for 160), then reduce brightness by 1/3 stop. If the picture profile settings are set for enough contrast that the 1/3 stop isn't used anyway, then the loss of highlights wont be noticed. It's the exact same thing as iso 50, except iso 50 clips a full stop of highlights (and reduces noise by a full stop).