The Swift-Mark 5 Bow Sight is the best available scope for bows. It does not provide any magnification, instead it provides 5 pins for distance compensation. For full benefit, it should be used in combination with a rangefinder.
A 3-pin bow sight that allows for quick and accurate range compensation using any compound bow. Once you've acquired the distance using your favorite rangefinder, simply select the appropriate pin and take the shot!