Burris XTR II - Manual (Page 9)

Dual Focal Plane System
The XTR II Dual Focal Plane system separates the center
aiming point and crosshairs of the reticle, placing the
center in the RFP and the crosshairs in the FFP. This
allows the center aiming point to remain a constant
size, ensuring the dot is large enough to be effective at
low power for close quarter shooting. The crosshairs
(which are in the FFP) change size with magnification,
meaning the measurements are always correct and
proportionate to the magnification. Since the two
pieces of the reticle are acting independently, the
pieces will overlap slightly at certain magnifications, but
this will not prevent the shooter from using the reticle
correctly.
The center aiming point, or the RFP portion of the reticle,
has illumination capabilities. The crosshairs, or the FFP
portion of the reticle, have no illumination capability.
Low Power View
High Power View
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