Dynamic range does not change with bit depth. The sensor always has the same dynamic range. All changing the bit depth does is change how many descrete levels exist between the brightest and darkest pixel levels.Hint: The title of the graph says "Photographic" dynamic range. DR in video most always takes a hit because the sensors are reading out at different bit depths. In the case of the R5: photo mode with mechanical shutter is 14-bit and video readout modes are 12-bit. Hence the 12-bit RAW output.
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