  We calculate the cross section and the beam asymmetry for exclusive
photoproduction of charmed particles near threshold ($\gamma+p\to \Lambda_c^+
+\bar{D^0}$), in the framework of an effective Lagrangian model. We discuss the
sensitivity of these observables to the magnetic moment of the $\Lambda_c$
baryon and of the coupling constant in the $p\Lambda_c D$ vertex. We show that
exclusive measurements allow, in principle, to determine the magnetic moments
of charmed baryons.
