Some developments in optical telescope instrumentation and data reduction systems in Japan.

ABSTRACT. In recent times, japanese astronomical instrumentation have been developed in radio and X-ray wavelength ranges, namely the 45-m mm radio telescope and the X-ray satellites, Hakucho, Hinotori, and Tenma, respectively. At optical wavelength, many efforts in developments of telescope instrumentations and data reduction systems are continued. At present, it is very considered the 7.5-m alt-azimuth telescope to be installed on Mauna Kea, Hawaii. In this paper, we will review our efforts on the following topics, although there are many other topics under studying: 1) design work on the 7.5-m telescope, 2) experiments of honeycomb mirror production, 3) development of accurate and high sensitivity detectors, 4) study of analysis system for speckle inter- ferometric observations, and 5) development of two dimensional image processing system. Key : OBSERVATORIES - TELESCOPES