What is the deal with a single pin sight? Aren' t you limiting yourself to a single yardage? Say you have it set for 20 yards and a deer comes in at 10 15 or 30 yards, aren' t you guesstimating arrow placement? I like the simplicity of it, it just doesn' t seem very practical. I am looking for a sight (using a buddies Cobra now) and I like the look of the Impact Archery sights (with the wrapped fiber optic), but the multi pin sight doesn' t look adjustable. The single pin sights do have adjustments for different yardage, but you have to unlock the sight, move the pin and then lock it back down. I could see this would be a difficult proposition in the heat of the moment. Any ideas?