  We refine our previous calculation of multipole amplitude $E_{0+}$ for pion
photo-production process, $\gamma N\rightarrow\pi N$. The treatment of final
state interactions is based upon an earlier analysis of pion-nucleon scattering
within Hamiltonian effective field theory, supplemented by incorporating
contributions from the $N^*(1650)$ and the $K\Lambda$ coupled channel. The
contribution from the bare state corresponding to the $N^*(1650)$ significantly
enhances our results. Additionally, we also compute the multipole amplitude
$M_{1-}$, which is of direct relevance to the Roper resonance. The results are
comparable with other dynamical coupled channel models, even though the
contribution from the bare state (interpreted as a 2s excitation) in this
channel is small because of its large mass.
