Electron beam shaping provides microscopists with a new way to see the electron microscope column as an optical bench for electrons [1, 2], with opportunities to perform new electron experiments and to measure new observables such as magnetic dichroism and vertical magnetic fields. This development relies on the creation of synthetic holograms, which allows arbitrary amplitude and phase profiles to be imparted to the electron beam. Such holograms are generated computationally by interfering a structured wave with a reference wave. The resulting patterns are transferred to electron-transparent SiN membranes using nanofabrication. Unfortunately, this approach is inefficient, as the materials themselves scatter electrons.In comparison, beam shaping in light optics permits patterns to be changed easily at the touch of a computer button. The technology of spatial light modulators based on liquid crystals offers the possibility of controlling the refractive index of a large matrix. An analogue for electrons has recently been proposed through the control of electrostatic fields [3]. Unfortunately, if one removes all material from the electron beam path, then electrostatic