  We present here an alternative method for calculating magnifications in
gravitational lensing calculations -- the Ray Bundle method. We provide a
detailed comparison between the distribution of magnifications obtained
compared with analytic results and conventional ray-shooting methods. The Ray
Bundle method provides high accuracy in the weak lensing limit, and is
computationally much faster than (non-hierarchical) ray shooting methods to a
comparable accuracy.
  The Ray Bundle method is a powerful and efficient technique with which to
study gravitational lensing within realistic cosmological models, particularly
in the weak lensing limit.
