  The recently-introduced Parity Expanded Variational Analysis (PEVA) technique
allows for the isolation of baryon eigenstates on the lattice at finite
momentum free from opposite-parity contamination. We find that this technique
introduces a statistically significant correction in extractions of the
electromagnetic form factors of the ground state nucleon. It also allows first
extractions of the elastic and transition form factors of nucleon excitations
on the lattice. We present the electromagnetic elastic form factors and
helicity amplitudes of two odd-parity excitations of the nucleon. These results
provide valuable insight into the structure of these states, and allow for a
connection to be made to quark-model states in this energy region.
