Main mirror diameter 6 m Focal length 24 m Light collecting area 26 sq.m Wavelength range 0.3 - 10 mkm Angular resolution 0.6 arcsec - with the application of speckle interferometry techniques 0.02 arcsec Mass of the main mirror 42 tons Total telescope mass 850 tons Telescope height 42 m Dome height 53 m Limiting stellar magnitude (1994) 26 The Observatory also has a 1-m and a 0.6-m telescope manufactured by "Karl-Zeiss-Jena" (Germany).