The Sun is an ideal target for the development and application of Multi-Conjugate Adaptive Optics (MCAO). A solar MCAO system is being developed by the National Solar Observatory, Adaptive Optics Project, with the purpose of extending the corrected science field of view to 1.25Arcmin. A detailed optical set-up, design and optical performance for such a system is presented and discussed here. The preliminary results for this first MCAO/DST run, are presented in more details by Langlois et al [1] at this conference.