  A novel approach to the calculation of the deflection of highly relativistic
test particles in gravitational fields is described. We make use of the
light-like boosts of the gravitational fields of the sources. Examples are
given of the deflection of highly relativistic particles in the Schwarzschild
and Kerr gravitational fields, in the field of a static, axially symmetric,
multipole source and in the field of a cosmic string. The deflection of
spinning particles is also discussed.
