Front Focal Plane Reticles
Front Focal Plane (FFP) systems (sometimes referred to as First Focal Plane systems) place the reticle in front of the erector assembly or zoom mechanism. This allows the reticle to change size as magnification is adjusted. In FFP systems, when magnification is increased, the reticle size grows; as magnification is lowered, the reticle size shrinks. Because the reticle is changing with magnification, the measurements of the reticle are always correct and proportional to the target no matter which power setting you may be on. This is very useful in tactical situations when reticles are used to determine size and distance to a target, and when using the reticle for trajectory compensation at multiple magnification settings.
Ballistic E1 FFP Reticle
Calculated in MOA, the Ballistic E1 FFP reticle features trajectory compensation out to 600 yards. Wind dots representing a 10 MPH wind adjustment are located at every hash mark out to 500 yards.