Pendulumsights are a useless gimmick designed to get hunters to part with their money. Think back to trigonometry class in high school. Remember the pythagorean theorem? The theorem can be used to tell you the actual distance to the deer if the horizontal distance and treestand height are known. The difference between the actual distance and the horizontal distance is less than one yard under normal bowhunting situations (ie 15 to 20 feet up and shots 30 yards or less).

For example if you are18 feet up in the airand the deer is 75 feet (25 yds) away from the base of your tree, the actual distance is 25.7 yards instead of 25. So your pendulum sight is "compensating" for that extra 0.7 yards. Big Deal. That's why pendulum sights are a bunch of BS in my opnion.

Just stick with a normal sight, bend at the waist, and practice from your treestand and you will be dead on.