ABSTRACT. Using a new f/31 secondary on a tip-tilt platform, we have built an image-stabilization system which has been used regularly for astronomical imaging and spectroscopy on the University of Hawaii 2.2 m telescope. Di †raction-limited cores of stellar point-spread functions are achieved in nearinfrared imaging, with Strehl ratios as high as 0.47. K-band images with FWHM resolution (without 0A .3 deconvolution) are routinely obtained. The construction, operation, and capability of the current system are described, a summary of recent scientiÐc Ðndings is presented, and future improvements are outlined.