An effective Coulomb correction term arising from the second order Dirac equation is calculated for Ca40. The optical potential used consists of a mixture of a Lorentz scalar potential and the timelike component of a Lorentz four-vector potential. These calculations show that the real Coulomb correction term resulting naturally from the Dirac equation is in agreement with empirics. NUCLEAR REACTIONS Relativistic optical potential, mean field theory of nuclear matter; Coulomb correction for Ca40. © 1981 The American Physical Society.