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The measured dynamic range for 4 different cameras is shown. Large pixel cameras have a larger dynamic range. The small pixel camera has a very good dynamic range, but that range rapidly deteriorates with increasing ISO. The large pixel cameras produced up to 2007 were limited by 12-bit analog-to-digital converters at low ISOs. The lower noise, 14-bit Canon 1D Mark III has boosted performance beyond the slightly larger pixel 1D Mark II. High ISO performance is about 1/2 stop better, similar to what was claimed by Canon when the camera was announced. This improvement is due to a better fill factor and lower read noise. Without the low noise 14-bit converter, the Mark III would plot to the lower left of the Mark II. The flattening of the dynamic range toward lower ISOs is due to noise in the camera electronics, such as the A/D converter
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