I'll begin by stating the obvious, I know that this would be easy enough to figure out in a real situation from a tree and I know I should have this figured out already, BUT, its 10:15 and I'm on the couch. If you were in your tree say 25 ft high and you dropped an arrow straight down, it would fall straight down. If you shot that arrow it would do the xact same thing right? Now, if you needed to use your sight on a straight down shot, you would use the pin closest to the arrow, which would still have you shooting aprox. 6" low, so you would need to compensate. Easy enough to figure out and get done. Now on to the question with the paragraph long intro. At what distance(or angle) from the base of the tree does the 6"(approx.) compensation end, and the 20yd(or 10) pin take affect? Again, I know it would be easy enough to figure out, but for discussion sake lets see what everyone says.