Ethan Alexander

Since it's an EI chart, you'd always be shooting at 800 (native) but exposing for 1600, which would mean you're stopping down or adding more ND, therefore protecting your highlights and giving you that increased DR above middle grey. This is different than selecting 1600 in the camera, which will give you less DR and more noise. DR will always be greatest at native, but where the stops fall (above or below middle grey) is up to how you rate the ISO for exposure.