Originally posted by stevebrot Yes, it depends on how it is measured. The "within frame" DR will never be greater than 14 stops due to bit depth, even when the response limits in terms of range of light may be greater. For benefit of those who are not familiar, the article below is helpful...
Raw bit depth is about dynamic range, not the number of colors you get to capture: Digital Photography Review
DXOMark uses a variant definition of dynamic range that will yield number higher than capture bit depth, but whether that translates to the real world is a matter of some discussion.
Steve
Dynamic range is how many times the lowest level of light is given as 1, compared to the brightest captured before you blow your highlights. 13 EV is 2 to the 13th times the lowest value captured. There is no saying how that is mapped onto the bits by the camera hardware. Dynamic range can certainly exceed 14 bits with a 14 bit depth sensor. Since the camera both captures the images and decides how to map what it captures, there's really no limit,
If a sensor captures a value of 20 EV, which is possible in nature, and maps it onto a 14 bit file, it's still captures 20 EV,
If you have a two bit sensor, and the lowest value it captures is 2 to the 13th brighter than the lowest value it captures, it's captured 13 EV with two bits. There will be no colour depth, and you'd essentially be limited to black, white, and two shades of grey, but it would still be 13 EV.
I don't know what DPR says and I don't care. They quite frequently don't have clue what they are talking about.