The altazimuth mount is especially suitable for large telescopes, but there still remains a significant issue. That is, two axes -- the horizontally rotating direction (azimuthal rotation) and the up-down direction (elevational rotation) -- must be controlled simultaneously.

Compared to the equatorial mount, in which only one rotational axis needs to be controlled, the movements of the altazimuth mount are considerably more difficult to control. However, Mitsubishi Electric has resolved this issue with its rigid mechanical control technology. The company succeeded in achieving high-level control based on the wealth of expertise cultivated through its work on SUBARU in Hawaii and the 45 meter radio telescope in Nobeyama, Japan.