  Long-exposure spectro-polarimetry in the near-infrared is a preferred method
to measure the magnetic field and other physical properties of solar
prominences. In the past, it has been very difficult to observe prominences in
this way with sufficient spatial resolution to fully understand their dynamical
properties. Solar prominences contain highly transient structures, visible only
at small spatial scales; hence they must be observed at sub-arcsecond
resolution, with a high temporal cadence. An adaptive optics (AO) system
capable of directly locking-on to prominence structure away from the solar limb
has the potential to allow for diffraction-limited spectro-polarimetry of solar
prominences. In this paper, the performance of the off-limb AO system and its
expected performance, at the desired science wavelength {\CaII} 8542A, are
shown.
