Discussion of JSC: The top left graph in Fig. 3 shows the normalized JSC as a function of relative cell-to-lens distance. This graph is divided into two separate regimes of cell-to-lens distance: a strongly varying JSC regime and a stable JSC regime. In the range of strongly varying JSC regime, photons in the wavelength range of the current limiting subcell miss the active cell area and, thus, are lost for current generation. In the cell-tolens regime with a stable JSC for all three lens and cell subunits, a plateau width of beyond four millimeters is found, where the JSC does not vary by more than 2%. The JSC plateau of the full-glass lens and cell A subunit is varying the least of the three subunits. The JSC differs by less than 0.2% between –1 and 2 mm.