Fig.1 Optical diagram of the spectrograph MOUSER .

Designations are : 1- corrector, 2 -illuminator of the calibration unit, 3a,b,c - collimator with interchangeable field linses, 4 - changeable diffraction grating (mirror), 5a,b, - spectrograph camera, 6a,b,c, - TV guide optics, 7 - fiber of the guiding field with the change - over optics, 8 - changeable magnifying microobjective, 9 - Wollastone prism, 10 - chromatism compensator, 11 - multipupil unit with the field lens, 12 - calibration source, 13 - TV guide, 14 - place for mounting of the Fabry- Perot focal reducer.