Nope,I sight my bow in from the ground.It's all about form.If you bend at the waste without dropping your bow arm,you should be dead nuts on.I was taught to shoot this way 24 years ago and I've never had a problem.I won't get into a physics debate because I'm not that smart.I'm just telling you,if the proper form is used,there's no need to compensate for being up in a tree.