In the paper we review the widefield adaptive optics systems including GeMS, LINC-NIRVANA, MAD, `Imaka, CANARY, RAVEN, MCAO installed on such telescopes as VTT, GREGOR, NST and DST. Review is relevant for the design Russian project of the Large solar telescope LST-3. The heights of the optical conjugation of the adaptive optics elements with turbulence layers as well as peculiarities in the MCAO systems` design are compared for different sites.
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