The next generation of 6 to 10 m class telescopes is being planned to include the capability for adaptive wavefront correction. The Multiple Mirror Telescope (MMT) with its 7 m baseline, provides an ideal testbed for novel techniques of adaptive optics. Using a new instrument based on a six segment adaptive mirror, a number of wavefront sensing algorithms including an artificial neural network have been implemented to demonstrate the high resolution imaging capability of the telescope. These algorithms rely on a freely available property of starlight, namely its coherence over large scales, to sense directly atmospheric and instrumental phase errors across large distances. In this paper, we report results obtained so far with resolutions between 0.08 and 0.3 arcseconds at 2.2 μm wavelength. We also show data indicating that at the level of 0.1 arcsec imaging in good seeing, the isoplanatic patch at this wavelength is at least 20 arcsec across.