  An accurate closed-form expression is provided to predict the bending angle
of light as a function of impact parameter for equatorial orbits around Kerr
black holes of arbitrary spin. This expression is constructed by assuring that
the weak- and strong-deflection limits are explicitly satisfied while
maintaining accuracy at intermediate values of impact parameter via the method
of asymptotic approximants (Barlow et al, 2016 Q. J. Mech. Appl. Math.,
doi=10.1093/qjmam/hbw014). To this end, the strong deflection limit for a
prograde orbit around an extremal black hole is examined, and the full
non-vanishing asymptotic behavior is determined. The derived approximant may be
an attractive alternative to computationally expensive elliptical integrals
used in black hole simulations.
