Originally posted by normhead There must be a new definition native ISO.
Meet the new native ISO, same as the old native ISO. Won't get fooled again.
My rudimentary knowledge of electronics suggests that the analog sensitivity of recent generations of CMOS sensors must be variable to produce useful images over a 20+ EV range in light intensity. So, if native ISO is defined as the sensitivity where the camera electronics don't apply any gain to the signal coming from the sensor, there probably isn't such a thing as native ISO. Furthermore, if there is a "sweet spot" for the ISO setting, who can say if that is because of the programming behind the sensor system, or because of intrinsic characteristics of the sensor. How many of the pictures you want to take are pictures where you have the ability to manipulate aperture and shutter speed to keep the camera's sensitivity at its sweet spot? (assuming you are able to determine what that sweet spot is) But as a means to compare cameras without discussing anything useful to the photographer, native ISO is a great concept.