  An exact solution is obtained for the gravitational bending of light in
static, spherically symmetric metrics which includes the Schwarzschild-de
Sitter spacetime and also the Mannheim-Kazanas metric of conformal Weyl
gravity. From the exact solution, we obtain a small bending-angle-approximation
for a lens system where the source, lens and observer are co-aligned. This
expansion improves previous calculations where we systematically avoid
parameter ranges that correspond to non-existent null trajectories. The linear
coefficient $\gamma$ characteristic to conformal gravity is shown to contribute
enhanced deflection compared to the angle predicted by General Relativity for
small $\gamma$.
