
This is one of those things you don't know until you try it. With tripods that have standard adjustments like levers and ball heads, it's difficult to make micro-adjustments to get to a REAL level. This adds just the right amount of control to really achieve accuracy. UPDATE It's been a few months and the adjustable screw has started falling apart on one of them. Disappointing, but at least 2 other controls still work. I still have to be patient until this shoot is finished.