The Corning Varioptic C-u-25H0-075 is based on an inverted and modified C-S-25H0-075. Combined with the use of specific extension rings, either for C-Mount or M12, an unexpensive autofocus microscope can be built. The module is built-in with an FPC cable, and can be connected to a standard 1mm pitch FPC connector. This module can be driven by the same drivers as the A-25H0 variable focus lens.