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I usually work with full pull out of most of the sections on a leg, and then pull out the top section to a known amount that I "eyeball" to the normal amount I work with on level ground. For level ground I match the other two legs for pull out while they are close to each other. For sloped ground, I would pull out the sections of the second and third leg a little or a lot more, and then put them on the down hill side. Most of the time I hit the height I want, and am level enough for stability. Then, if I want to level the tripod to allow a level pan base movement, I proceed to do that by adjusting only the top section leg clamps, one leg at a time. And it helps to have a good level on the system, like the add on ones that Really Right Stuff sells to match their BH-55 and BH-40 ball heads.