  We describe how the geometry of the Higgs branch of 5d superconformal field
theories is transformed under movement along the extended Coulomb branch.
Working directly with the (unitary) magnetic quiver, we demonstrate a
correspondence between Fayet-Iliopoulos deformations in 3d and 5d mass
deformations. When the Higgs branch has multiple cones, characterised by a
collection of magnetic quivers, the mirror map is not globally well-defined,
however we are able to utilize the correspondence to establish a local version
of mirror symmetry. We give several detailed examples of deformations,
including decouplings and weak-coupling limits, in $(D_n,D_n)$ conformal matter
theories, $T_N$ theory and its parent $P_N$, for which we find new Lagrangian
descriptions given by quiver gauge theories with fundamental and anti-symmetric
matter.
