The Spectrograph is intended for multiobject spectroscopy up to 75 objects within the BTA field of view with medium spectral resolution. ... Fibers are shorter then 0.5 m in length and transmit near 80 % of light in the spectral range 3700-9600 A. Fibers are organized in block unit with the possibility to change together with mask. ... The mask has two additional holes to hold a pair of fibers of 3(26") mm in diameter to project the images of stars needed for adjustment the field and guiding. ...