BTA image
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).