I used to use a Keller pendulum sight, years ago. Once bows got faster, I really didn't see the need. If you have a fast bow, the first pin should be good to 30 yards. I use a 3 pin sight,20,30,40 yard. The first 2 are very close together. My bow is not all that fast, it's about 12 years old. Range spots in the woods before the deer show up, that way your not trying to range the deer. Once the deer show up, your concentration should be about making a good shot, not yardage.