In Einstein-nonlinear electrodynamic black holes, each effective potential peak that is taller than all peaks outside it yields a separate photon ring cluster in the lensed image, and triple-peak cases show three nested critical curves.
Shadows of the accelerating black holes
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Due to the acceleration of the black hole, the circular orbits of the photons will deviate from the equatorial plane and the property of the black hole shadow will change. We find that the latitude of the circular orbit increases with the increasing acceleration and then show that the observer's inclination angles which make the shadow radius and the shadow distortion maximum increase with the increasing acceleration for the accelerating Kerr black hole.
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Gravitational Lensing by Black Holes in Einstein-nonlinear Electrodynamic Theories with Multiple Photon Spheres
In Einstein-nonlinear electrodynamic black holes, each effective potential peak that is taller than all peaks outside it yields a separate photon ring cluster in the lensed image, and triple-peak cases show three nested critical curves.