I will describe the Image Motion Compensation System (IMCS), a flexure compensation system for the MODS Spectrograph. The MODS Spectrograph is a pair of cassegrain optical spectrographs that Ohio State is building for the LBT. The IMCS performs active, closed-loop image motion compensation, correcting for image motion in the spectrograph's focal plane caused by large-scale structural bending due to gravity as well as other effects such as temperature fluctuation and mechanism flexure within the instrument. The system is currently functioning in the MODS instrument and controls instrumental flexure to within specifications.