If you're 20 feet up in the air and taking a 5 yard shot, the "effective" distance becomes8 yards instead of 5 yards. Either way, it's the same pin. Why do I need a pendulum sight for that?

Between 10 and 30 yards out you don't need a pendulum sight unless you plan on hunting 50 feet up in the tree or higher. The difference between horizontal distance and actual distance is about 5 yards IF you are hunting 50 feet high in the tree.

I don't know too many guys that go that high. [:-]