We describe strategies for zonal wavefront correction and generation using liquid crystal spatial light modulators LC-SLM. with 2p radians phase dynamic range and limited spatial resolution. Computer simulations using realistic wavefront aberrations and the specification of a commercially available LC-SLM device are shown. In spite of the general modest improvement in the correction of large aberrations, the best performance after compensation is attained with a phasor averaging strategy for driving the LC-SLM. Experimental results for wavefront generation are shown as well. q1998 Elsevier Science B.V. All rights reserved.