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We investigate the null geodesic flow and in particular the light rings(LRs), fundamental photon orbits (FPOs) and shadows of a black hole (BH)immersed in a strong, uniform magnetic field, described by theSchwarzschilld-Melvin electrovacuum solution. The empty Melvin magneticUniverse contains a tube of planar LRs. Including a BH, for weak magneticfields, the shadow becomes oblate, whereas the intrinsic horizon geometrybecomes prolate. For strong magnetic fields (over-critical solutions), thereare no LRs outside the BH horizon, a result explained using topologicalarguments. This feature, together with the light confining structure of theMelvin Universe yields \textit{panoramic shadows}, seen (almost) all around theequator of the observer's sky. Despite the lack of LRs, there are FPOs,including polar planar ones, which define the shadow edge. We also observe anddiscuss chaotic lensing, including in the empty Melvin Universe, and multipledisconnected shadows.

Shadows and lensing of black holes immersed in strong magnetic fields