Eric thank you for doing the test. Your results match what I would have expected based upon my reading of thom's book and my discussion with Nikon. The only surprise to me was that at higher settings it left the reduced exposure active when ADL was turned turned off in post. Your exercise with trying to produce the same result without ADL also matches what I have been saying. The algorithm is complex and if you were ever able to match it, it would most likely be dumb luck, and therefore if you are not using a post processor that uses the Nikon tool kit, it is just better to leave ADL off. I think your testing was a great service to the rest of us in providing real data rather than having people listen to me beat my gums about how it functions without backup test data. One final comment from Nikon I would like to repeat here is that they never intended this ADL setting to be one that you would normally set to on in camera, but rather a handy tool to apply when you ran into a high dynamic range situation where you were trying to get the best image while minimizing blown highlights. DL comes close and is a post processing tool, but the methods used are not exactly the same as ADL.