Homing repeatability was assessed using this MATLAB script. The tests were performed on Olympus BX51 microscope using an England Finder slide. Objective - UPlanFL 4X/0.13, camera - AVT Manta G282C mounted in primary image plane (no relay lens). Pixel size with this setup was 1 μm. Tests were performed with 24V power supply after the system has been used for about one hour. Relocation errors were estimated with a purpose-written software that calculates shifts between images with sub-pixel accuracy (0.1 of pixel size). Relocation errors from individual repetitions of the test recalculated in microns are given by the following plots.