  We present parametrizations of the $\gamma^\ast N \to N(1535)1/2^-$,
$\gamma^\ast N \to N(1520)3/2^-$ and $\gamma^\ast N \to \Delta(1232)3/2^+$
transition amplitudes that are compatible with the analytic constraints at the
pseudothreshold (Siegert's theorem). The presented parametrizations also
provide a fair description of the experimental data. For the case of the
$\gamma^\ast N \to \Delta(1232)3/2^+$ transition, we discuss how the pion cloud
parametrizations of the electric and the Coulomb quadrupole form factors can be
adjusted according to the Siegert's theorem.
