The main lens diameter is 71.12 cm (28.00 in), the correcting bi-concave and convex lens is 50 cm (20 in) with a focal length of 2.5 m (8.2 ft). It is also equipped with a spectral prism with a prime angle of 6.10 degrees for stellar spectra, a wedge sensitometer and a film recorder. The Bamberg refractor This telescope is used to determine stellar magnitude, stellar distance, and photometric studies of eclipsing stars, solar imaging, and others.