The main feature of large ten-meter telescope is usage of 84 primary mirrQrsgments which are united in one reflecting system [1]. This desigion makes easier the problem of the primary mirror manufacturing but brings another task-drives designing for every mirror segment mooving with high precision (nanometer accuracy) which provides perfect coincedence of mirror segments constantly. There are suggested two variants of the drive construction based on magnetic-rheology liquid. This drive provides nanometer precision and millisecond quickaction.

The design, parameters and the amplitude-frequency analysis of the new magnetic rheology (MR) drive are presented. The combination of hydrostatic carrier, MR hydraulic ioop control, elastic thin wall seal joined in a single unit ensures small positioning error &p 50 nm and small time ofresponse ms.

The development ofthe largescale telescope building is pressingly putting the question ofthe 5-Th generation supertelescope development with 25m diameter primary mirrow, having penetrating ability about 29 magnitude. The volume of information obtained on the supertelescope, will allow to expand the idea about the Universe origin and evolution greatly. On the basis ofthe system analysis ofthe technical and explotation requirements, and also the trends of the modem optical building, the main problems have been formulated concerning the question ofthe 25m class supertelescope development, and the ways oftheir solution as well the concept and the variant of the supertelescope construction have been proposed, that combine a number of original schematic, constructive and technological solutions with the application of linear adaptive methods and devices. The ground-based athptive supertelescopes ofthe given concept have unique possibilities in the field ofthe fundamental researches. They decrease withdraw the acuteness ofthe problem solution, connected also with the necessity of space telescope development, and they save large sums of money as well.

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