If it sounds a little like HDR, the idea is similar. The data from the alternating rows are then combined and the missing data is interpolated. Half of the rows capture the image at a high ISO (for shadow detail) and half at a low ISO (to retain highlights). Dual ISO works by splitting the sensor’s output into alternating horizontal rows. The samples are interesting, and appear to back up the claims. Dual ISO can be applied to stills and video on the 5D Mark III but only still images on the 7D. They call their latest release Dual ISO and claim that it expands the dynamic range of the 5D Mark III and EOS 7D by four stops, giving those cameras a total dynamic range of 14EV. Magic Lantern, the folks behind the free EOS Camera Tool software for Canon DSLRs, have released a custom firmware hack for the Canon 5D Mark III and 7D. Note the detail retained in the shadows and in the window highlights.
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