Magnifications of 27 micro-lenses were measured at different locations across the field of view. A fluorescent bead originally placed at the center of the field of view (x, y, z = 0) was moved to six different locations (x = 200 μm, 300 μm, 400 μm, −200 μm, −300 μm, −400 μm, y = 0, z = 0). Six classes of the bead’s image shifts, represented by different colors, were measured. Each class consisted of 27 image shifts formed by 27 micro-lenses. Within each class, image shifts were normalized to the one from the first micro-lens. The first 12 micro-lenses and the rest formed two different groups of micro-lenses: group B and group A, consistent with Figure 1—figure supplements 3 and 4. The magnification variation of a single micro-lens across the field of view was small (<0.3%), suggesting that the spatial invariance of individual micro-lens’ PSF was well preserved across the field of view of Ø = 800 μm. The variation across different micro-lenses within one group (A/B) was more evident (~2%), suggesting that the combined PSF from different micro-lenses was not perfectly spatially invariant.