  The form factors for the radiative transitions between charmonium mesons are
investigated. We employ an anisotropic lattice using a Wilson gauge action, and
domain-wall fermion action. We extrapolate the form factors to $Q^2 = 0$,
corresponding to a real photon, using quark-model-inspired functions. Finally,
comparison is made with photocouplings extracted from the measured radiative
widths, where known. Our preliminary results find photocouplings commensurate
with these experimentally extracted values.
