The RF acts like a primitive form of auto aim. It helps to make sniping easier for the unexperianced. Learning how to use the scope's elavation notches to fine tune long range shots is too difficult for some players to understand or enjoy. In older games (and COD) the crosshair always points to where the bullet will land and lag is the only factor that can effect your hits. In BF3 elevation and distance must be taken in to consideration.